YQ Connector:Use docker-compose in integrational tests

66 files changed, 16655 insertions, 0 deletions

diff --git a/contrib/python/coverage/py3/.dist-info/METADATA b/contrib/python/coverage/py3/.dist-info/METADATA
new file mode 100644
index 0000000000..25a6049c45
--- /dev/null
+++ b/contrib/python/coverage/py3/.dist-info/METADATA
@@ -0,0 +1,190 @@
+Metadata-Version: 2.1
+Name: coverage
+Version: 5.5
+Summary: Code coverage measurement for Python
+Home-page: https://github.com/nedbat/coveragepy
+Author: Ned Batchelder and 142 others
+Author-email: ned@nedbatchelder.com
+License: Apache 2.0
+Project-URL: Documentation, https://coverage.readthedocs.io
+Project-URL: Funding, https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=pypi
+Project-URL: Issues, https://github.com/nedbat/coveragepy/issues
+Keywords: code coverage testing
+Platform: UNKNOWN
+Classifier: Environment :: Console
+Classifier: Intended Audience :: Developers
+Classifier: License :: OSI Approved :: Apache Software License
+Classifier: Operating System :: OS Independent
+Classifier: Programming Language :: Python
+Classifier: Programming Language :: Python :: 2
+Classifier: Programming Language :: Python :: 2.7
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.5
+Classifier: Programming Language :: Python :: 3.6
+Classifier: Programming Language :: Python :: 3.7
+Classifier: Programming Language :: Python :: 3.8
+Classifier: Programming Language :: Python :: 3.9
+Classifier: Programming Language :: Python :: 3.10
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
+Classifier: Topic :: Software Development :: Quality Assurance
+Classifier: Topic :: Software Development :: Testing
+Classifier: Development Status :: 5 - Production/Stable
+Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4
+Description-Content-Type: text/x-rst
+Provides-Extra: toml
+Requires-Dist: toml ; extra == 'toml'
+
+.. Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+.. For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+===========
+Coverage.py
+===========
+
+Code coverage testing for Python.
+
+|  |license| |versions| |status|
+|  |test-status| |quality-status| |docs| |codecov|
+|  |kit| |format| |repos| |downloads|
+|  |stars| |forks| |contributors|
+|  |tidelift| |twitter-coveragepy| |twitter-nedbat|
+
+Coverage.py measures code coverage, typically during test execution. It uses
+the code analysis tools and tracing hooks provided in the Python standard
+library to determine which lines are executable, and which have been executed.
+
+Coverage.py runs on many versions of Python:
+
+* CPython 2.7.
+* CPython 3.5 through 3.10 alpha.
+* PyPy2 7.3.3 and PyPy3 7.3.3.
+
+Documentation is on `Read the Docs`_.  Code repository and issue tracker are on
+`GitHub`_.
+
+.. _Read the Docs: https://coverage.readthedocs.io/
+.. _GitHub: https://github.com/nedbat/coveragepy
+
+
+**New in 5.x:** SQLite data storage, JSON report, contexts, relative filenames,
+dropped support for Python 2.6, 3.3 and 3.4.
+
+
+For Enterprise
+--------------
+
+.. |tideliftlogo| image:: https://nedbatchelder.com/pix/Tidelift_Logo_small.png
+   :alt: Tidelift
+   :target: https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=readme
+
+.. list-table::
+   :widths: 10 100
+
+   * - |tideliftlogo|
+     - `Available as part of the Tidelift Subscription. <https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=readme>`_
+       Coverage and thousands of other packages are working with
+       Tidelift to deliver one enterprise subscription that covers all of the open
+       source you use.  If you want the flexibility of open source and the confidence
+       of commercial-grade software, this is for you.
+       `Learn more. <https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=readme>`_
+
+
+Getting Started
+---------------
+
+See the `Quick Start section`_ of the docs.
+
+.. _Quick Start section: https://coverage.readthedocs.io/#quick-start
+
+
+Change history
+--------------
+
+The complete history of changes is on the `change history page`_.
+
+.. _change history page: https://coverage.readthedocs.io/en/latest/changes.html
+
+
+Contributing
+------------
+
+See the `Contributing section`_ of the docs.
+
+.. _Contributing section: https://coverage.readthedocs.io/en/latest/contributing.html
+
+
+Security
+--------
+
+To report a security vulnerability, please use the `Tidelift security
+contact`_.  Tidelift will coordinate the fix and disclosure.
+
+.. _Tidelift security contact: https://tidelift.com/security
+
+
+License
+-------
+
+Licensed under the `Apache 2.0 License`_.  For details, see `NOTICE.txt`_.
+
+.. _Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+.. _NOTICE.txt: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+
+.. |test-status| image:: https://github.com/nedbat/coveragepy/actions/workflows/testsuite.yml/badge.svg?branch=master&event=push
+    :target: https://github.com/nedbat/coveragepy/actions/workflows/testsuite.yml
+    :alt: Test suite status
+.. |quality-status| image:: https://github.com/nedbat/coveragepy/actions/workflows/quality.yml/badge.svg?branch=master&event=push
+    :target: https://github.com/nedbat/coveragepy/actions/workflows/quality.yml
+    :alt: Quality check status
+.. |docs| image:: https://readthedocs.org/projects/coverage/badge/?version=latest&style=flat
+    :target: https://coverage.readthedocs.io/
+    :alt: Documentation
+.. |reqs| image:: https://requires.io/github/nedbat/coveragepy/requirements.svg?branch=master
+    :target: https://requires.io/github/nedbat/coveragepy/requirements/?branch=master
+    :alt: Requirements status
+.. |kit| image:: https://badge.fury.io/py/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: PyPI status
+.. |format| image:: https://img.shields.io/pypi/format/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: Kit format
+.. |downloads| image:: https://img.shields.io/pypi/dw/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: Weekly PyPI downloads
+.. |versions| image:: https://img.shields.io/pypi/pyversions/coverage.svg?logo=python&logoColor=FBE072
+    :target: https://pypi.org/project/coverage/
+    :alt: Python versions supported
+.. |status| image:: https://img.shields.io/pypi/status/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: Package stability
+.. |license| image:: https://img.shields.io/pypi/l/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: License
+.. |codecov| image:: https://codecov.io/github/nedbat/coveragepy/coverage.svg?branch=master&precision=2
+    :target: https://codecov.io/github/nedbat/coveragepy?branch=master
+    :alt: Coverage!
+.. |repos| image:: https://repology.org/badge/tiny-repos/python:coverage.svg
+    :target: https://repology.org/metapackage/python:coverage/versions
+    :alt: Packaging status
+.. |tidelift| image:: https://tidelift.com/badges/package/pypi/coverage
+    :target: https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=readme
+    :alt: Tidelift
+.. |stars| image:: https://img.shields.io/github/stars/nedbat/coveragepy.svg?logo=github
+    :target: https://github.com/nedbat/coveragepy/stargazers
+    :alt: Github stars
+.. |forks| image:: https://img.shields.io/github/forks/nedbat/coveragepy.svg?logo=github
+    :target: https://github.com/nedbat/coveragepy/network/members
+    :alt: Github forks
+.. |contributors| image:: https://img.shields.io/github/contributors/nedbat/coveragepy.svg?logo=github
+    :target: https://github.com/nedbat/coveragepy/graphs/contributors
+    :alt: Contributors
+.. |twitter-coveragepy| image:: https://img.shields.io/twitter/follow/coveragepy.svg?label=coveragepy&style=flat&logo=twitter&logoColor=4FADFF
+    :target: https://twitter.com/coveragepy
+    :alt: coverage.py on Twitter
+.. |twitter-nedbat| image:: https://img.shields.io/twitter/follow/nedbat.svg?label=nedbat&style=flat&logo=twitter&logoColor=4FADFF
+    :target: https://twitter.com/nedbat
+    :alt: nedbat on Twitter
+
+
diff --git a/contrib/python/coverage/py3/.dist-info/entry_points.txt b/contrib/python/coverage/py3/.dist-info/entry_points.txt
new file mode 100644
index 0000000000..cd083fc1ff
--- /dev/null
+++ b/contrib/python/coverage/py3/.dist-info/entry_points.txt
@@ -0,0 +1,5 @@
+[console_scripts]
+coverage = coverage.cmdline:main
+coverage-3.9 = coverage.cmdline:main
+coverage3 = coverage.cmdline:main
+
diff --git a/contrib/python/coverage/py3/.dist-info/top_level.txt b/contrib/python/coverage/py3/.dist-info/top_level.txt
new file mode 100644
index 0000000000..4ebc8aea50
--- /dev/null
+++ b/contrib/python/coverage/py3/.dist-info/top_level.txt
@@ -0,0 +1 @@
+coverage
diff --git a/contrib/python/coverage/py3/LICENSE.txt b/contrib/python/coverage/py3/LICENSE.txt
new file mode 100644
index 0000000000..f433b1a53f
--- /dev/null
+++ b/contrib/python/coverage/py3/LICENSE.txt
@@ -0,0 +1,177 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
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+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
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+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
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+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
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+      communication on electronic mailing lists, source code control systems,
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+      designated in writing by the copyright owner as "Not a Contribution."
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
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+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
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+      this License, each Contributor hereby grants to You a perpetual,
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+      (except as stated in this section) patent license to make, have made,
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+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
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+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
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+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
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+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
diff --git a/contrib/python/coverage/py3/NOTICE.txt b/contrib/python/coverage/py3/NOTICE.txt
new file mode 100644
index 0000000000..37ded535bf
--- /dev/null
+++ b/contrib/python/coverage/py3/NOTICE.txt
@@ -0,0 +1,14 @@
+Copyright 2001 Gareth Rees.  All rights reserved.
+Copyright 2004-2021 Ned Batchelder.  All rights reserved.
+
+Except where noted otherwise, this software is licensed under the Apache
+License, Version 2.0 (the "License"); you may not use this work except in
+compliance with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
diff --git a/contrib/python/coverage/py3/README.rst b/contrib/python/coverage/py3/README.rst
new file mode 100644
index 0000000000..072f30ffeb
--- /dev/null
+++ b/contrib/python/coverage/py3/README.rst
@@ -0,0 +1,151 @@
+.. Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+.. For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+===========
+Coverage.py
+===========
+
+Code coverage testing for Python.
+
+|  |license| |versions| |status|
+|  |test-status| |quality-status| |docs| |codecov|
+|  |kit| |format| |repos| |downloads|
+|  |stars| |forks| |contributors|
+|  |tidelift| |twitter-coveragepy| |twitter-nedbat|
+
+Coverage.py measures code coverage, typically during test execution. It uses
+the code analysis tools and tracing hooks provided in the Python standard
+library to determine which lines are executable, and which have been executed.
+
+Coverage.py runs on many versions of Python:
+
+* CPython 2.7.
+* CPython 3.5 through 3.10 alpha.
+* PyPy2 7.3.3 and PyPy3 7.3.3.
+
+Documentation is on `Read the Docs`_.  Code repository and issue tracker are on
+`GitHub`_.
+
+.. _Read the Docs: https://coverage.readthedocs.io/
+.. _GitHub: https://github.com/nedbat/coveragepy
+
+
+**New in 5.x:** SQLite data storage, JSON report, contexts, relative filenames,
+dropped support for Python 2.6, 3.3 and 3.4.
+
+
+For Enterprise
+--------------
+
+.. |tideliftlogo| image:: https://nedbatchelder.com/pix/Tidelift_Logo_small.png
+   :alt: Tidelift
+   :target: https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=readme
+
+.. list-table::
+   :widths: 10 100
+
+   * - |tideliftlogo|
+     - `Available as part of the Tidelift Subscription. <https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=readme>`_
+       Coverage and thousands of other packages are working with
+       Tidelift to deliver one enterprise subscription that covers all of the open
+       source you use.  If you want the flexibility of open source and the confidence
+       of commercial-grade software, this is for you.
+       `Learn more. <https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=readme>`_
+
+
+Getting Started
+---------------
+
+See the `Quick Start section`_ of the docs.
+
+.. _Quick Start section: https://coverage.readthedocs.io/#quick-start
+
+
+Change history
+--------------
+
+The complete history of changes is on the `change history page`_.
+
+.. _change history page: https://coverage.readthedocs.io/en/latest/changes.html
+
+
+Contributing
+------------
+
+See the `Contributing section`_ of the docs.
+
+.. _Contributing section: https://coverage.readthedocs.io/en/latest/contributing.html
+
+
+Security
+--------
+
+To report a security vulnerability, please use the `Tidelift security
+contact`_.  Tidelift will coordinate the fix and disclosure.
+
+.. _Tidelift security contact: https://tidelift.com/security
+
+
+License
+-------
+
+Licensed under the `Apache 2.0 License`_.  For details, see `NOTICE.txt`_.
+
+.. _Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+.. _NOTICE.txt: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+
+.. |test-status| image:: https://github.com/nedbat/coveragepy/actions/workflows/testsuite.yml/badge.svg?branch=master&event=push
+    :target: https://github.com/nedbat/coveragepy/actions/workflows/testsuite.yml
+    :alt: Test suite status
+.. |quality-status| image:: https://github.com/nedbat/coveragepy/actions/workflows/quality.yml/badge.svg?branch=master&event=push
+    :target: https://github.com/nedbat/coveragepy/actions/workflows/quality.yml
+    :alt: Quality check status
+.. |docs| image:: https://readthedocs.org/projects/coverage/badge/?version=latest&style=flat
+    :target: https://coverage.readthedocs.io/
+    :alt: Documentation
+.. |reqs| image:: https://requires.io/github/nedbat/coveragepy/requirements.svg?branch=master
+    :target: https://requires.io/github/nedbat/coveragepy/requirements/?branch=master
+    :alt: Requirements status
+.. |kit| image:: https://badge.fury.io/py/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: PyPI status
+.. |format| image:: https://img.shields.io/pypi/format/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: Kit format
+.. |downloads| image:: https://img.shields.io/pypi/dw/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: Weekly PyPI downloads
+.. |versions| image:: https://img.shields.io/pypi/pyversions/coverage.svg?logo=python&logoColor=FBE072
+    :target: https://pypi.org/project/coverage/
+    :alt: Python versions supported
+.. |status| image:: https://img.shields.io/pypi/status/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: Package stability
+.. |license| image:: https://img.shields.io/pypi/l/coverage.svg
+    :target: https://pypi.org/project/coverage/
+    :alt: License
+.. |codecov| image:: https://codecov.io/github/nedbat/coveragepy/coverage.svg?branch=master&precision=2
+    :target: https://codecov.io/github/nedbat/coveragepy?branch=master
+    :alt: Coverage!
+.. |repos| image:: https://repology.org/badge/tiny-repos/python:coverage.svg
+    :target: https://repology.org/metapackage/python:coverage/versions
+    :alt: Packaging status
+.. |tidelift| image:: https://tidelift.com/badges/package/pypi/coverage
+    :target: https://tidelift.com/subscription/pkg/pypi-coverage?utm_source=pypi-coverage&utm_medium=referral&utm_campaign=readme
+    :alt: Tidelift
+.. |stars| image:: https://img.shields.io/github/stars/nedbat/coveragepy.svg?logo=github
+    :target: https://github.com/nedbat/coveragepy/stargazers
+    :alt: Github stars
+.. |forks| image:: https://img.shields.io/github/forks/nedbat/coveragepy.svg?logo=github
+    :target: https://github.com/nedbat/coveragepy/network/members
+    :alt: Github forks
+.. |contributors| image:: https://img.shields.io/github/contributors/nedbat/coveragepy.svg?logo=github
+    :target: https://github.com/nedbat/coveragepy/graphs/contributors
+    :alt: Contributors
+.. |twitter-coveragepy| image:: https://img.shields.io/twitter/follow/coveragepy.svg?label=coveragepy&style=flat&logo=twitter&logoColor=4FADFF
+    :target: https://twitter.com/coveragepy
+    :alt: coverage.py on Twitter
+.. |twitter-nedbat| image:: https://img.shields.io/twitter/follow/nedbat.svg?label=nedbat&style=flat&logo=twitter&logoColor=4FADFF
+    :target: https://twitter.com/nedbat
+    :alt: nedbat on Twitter
diff --git a/contrib/python/coverage/py3/coverage/__init__.py b/contrib/python/coverage/py3/coverage/__init__.py
new file mode 100644
index 0000000000..331b304b68
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/__init__.py
@@ -0,0 +1,36 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Code coverage measurement for Python.
+
+Ned Batchelder
+https://nedbatchelder.com/code/coverage
+
+"""
+
+import sys
+
+from coverage.version import __version__, __url__, version_info
+
+from coverage.control import Coverage, process_startup
+from coverage.data import CoverageData
+from coverage.misc import CoverageException
+from coverage.plugin import CoveragePlugin, FileTracer, FileReporter
+from coverage.pytracer import PyTracer
+
+# Backward compatibility.
+coverage = Coverage
+
+# On Windows, we encode and decode deep enough that something goes wrong and
+# the encodings.utf_8 module is loaded and then unloaded, I don't know why.
+# Adding a reference here prevents it from being unloaded.  Yuk.
+import encodings.utf_8      # pylint: disable=wrong-import-position, wrong-import-order
+
+# Because of the "from coverage.control import fooey" lines at the top of the
+# file, there's an entry for coverage.coverage in sys.modules, mapped to None.
+# This makes some inspection tools (like pydoc) unable to find the class
+# coverage.coverage.  So remove that entry.
+try:
+    del sys.modules['coverage.coverage']
+except KeyError:
+    pass
diff --git a/contrib/python/coverage/py3/coverage/__main__.py b/contrib/python/coverage/py3/coverage/__main__.py
new file mode 100644
index 0000000000..79aa4e2b35
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/__main__.py
@@ -0,0 +1,8 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Coverage.py's main entry point."""
+
+import sys
+from coverage.cmdline import main
+sys.exit(main())
diff --git a/contrib/python/coverage/py3/coverage/annotate.py b/contrib/python/coverage/py3/coverage/annotate.py
new file mode 100644
index 0000000000..999ab6e557
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/annotate.py
@@ -0,0 +1,108 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Source file annotation for coverage.py."""
+
+import io
+import os
+import re
+
+from coverage.files import flat_rootname
+from coverage.misc import ensure_dir, isolate_module
+from coverage.report import get_analysis_to_report
+
+os = isolate_module(os)
+
+
+class AnnotateReporter(object):
+    """Generate annotated source files showing line coverage.
+
+    This reporter creates annotated copies of the measured source files. Each
+    .py file is copied as a .py,cover file, with a left-hand margin annotating
+    each line::
+
+        > def h(x):
+        -     if 0:   #pragma: no cover
+        -         pass
+        >     if x == 1:
+        !         a = 1
+        >     else:
+        >         a = 2
+
+        > h(2)
+
+    Executed lines use '>', lines not executed use '!', lines excluded from
+    consideration use '-'.
+
+    """
+
+    def __init__(self, coverage):
+        self.coverage = coverage
+        self.config = self.coverage.config
+        self.directory = None
+
+    blank_re = re.compile(r"\s*(#|$)")
+    else_re = re.compile(r"\s*else\s*:\s*(#|$)")
+
+    def report(self, morfs, directory=None):
+        """Run the report.
+
+        See `coverage.report()` for arguments.
+
+        """
+        self.directory = directory
+        self.coverage.get_data()
+        for fr, analysis in get_analysis_to_report(self.coverage, morfs):
+            self.annotate_file(fr, analysis)
+
+    def annotate_file(self, fr, analysis):
+        """Annotate a single file.
+
+        `fr` is the FileReporter for the file to annotate.
+
+        """
+        statements = sorted(analysis.statements)
+        missing = sorted(analysis.missing)
+        excluded = sorted(analysis.excluded)
+
+        if self.directory:
+            ensure_dir(self.directory)
+            dest_file = os.path.join(self.directory, flat_rootname(fr.relative_filename()))
+            if dest_file.endswith("_py"):
+                dest_file = dest_file[:-3] + ".py"
+            dest_file += ",cover"
+        else:
+            dest_file = fr.filename + ",cover"
+
+        with io.open(dest_file, 'w', encoding='utf8') as dest:
+            i = 0
+            j = 0
+            covered = True
+            source = fr.source()
+            for lineno, line in enumerate(source.splitlines(True), start=1):
+                while i < len(statements) and statements[i] < lineno:
+                    i += 1
+                while j < len(missing) and missing[j] < lineno:
+                    j += 1
+                if i < len(statements) and statements[i] == lineno:
+                    covered = j >= len(missing) or missing[j] > lineno
+                if self.blank_re.match(line):
+                    dest.write(u'  ')
+                elif self.else_re.match(line):
+                    # Special logic for lines containing only 'else:'.
+                    if i >= len(statements) and j >= len(missing):
+                        dest.write(u'! ')
+                    elif i >= len(statements) or j >= len(missing):
+                        dest.write(u'> ')
+                    elif statements[i] == missing[j]:
+                        dest.write(u'! ')
+                    else:
+                        dest.write(u'> ')
+                elif lineno in excluded:
+                    dest.write(u'- ')
+                elif covered:
+                    dest.write(u'> ')
+                else:
+                    dest.write(u'! ')
+
+                dest.write(line)
diff --git a/contrib/python/coverage/py3/coverage/backward.py b/contrib/python/coverage/py3/coverage/backward.py
new file mode 100644
index 0000000000..ac781ab96a
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/backward.py
@@ -0,0 +1,267 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Add things to old Pythons so I can pretend they are newer."""
+
+# This file's purpose is to provide modules to be imported from here.
+# pylint: disable=unused-import
+
+import os
+import sys
+
+from datetime import datetime
+
+from coverage import env
+
+
+# Pythons 2 and 3 differ on where to get StringIO.
+try:
+    from cStringIO import StringIO
+except ImportError:
+    from io import StringIO
+
+# In py3, ConfigParser was renamed to the more-standard configparser.
+# But there's a py3 backport that installs "configparser" in py2, and I don't
+# want it because it has annoying deprecation warnings. So try the real py2
+# import first.
+try:
+    import ConfigParser as configparser
+except ImportError:
+    import configparser
+
+# What's a string called?
+try:
+    string_class = basestring
+except NameError:
+    string_class = str
+
+# What's a Unicode string called?
+try:
+    unicode_class = unicode
+except NameError:
+    unicode_class = str
+
+# range or xrange?
+try:
+    range = xrange      # pylint: disable=redefined-builtin
+except NameError:
+    range = range
+
+try:
+    from itertools import zip_longest
+except ImportError:
+    from itertools import izip_longest as zip_longest
+
+# Where do we get the thread id from?
+try:
+    from thread import get_ident as get_thread_id
+except ImportError:
+    from threading import get_ident as get_thread_id
+
+try:
+    os.PathLike
+except AttributeError:
+    # This is Python 2 and 3
+    path_types = (bytes, string_class, unicode_class)
+else:
+    # 3.6+
+    path_types = (bytes, str, os.PathLike)
+
+# shlex.quote is new, but there's an undocumented implementation in "pipes",
+# who knew!?
+try:
+    from shlex import quote as shlex_quote
+except ImportError:
+    # Useful function, available under a different (undocumented) name
+    # in Python versions earlier than 3.3.
+    from pipes import quote as shlex_quote
+
+try:
+    import reprlib
+except ImportError:             # pragma: not covered
+    # We need this on Python 2, but in testing environments, a backport is
+    # installed, so this import isn't used.
+    import repr as reprlib
+
+# A function to iterate listlessly over a dict's items, and one to get the
+# items as a list.
+try:
+    {}.iteritems
+except AttributeError:
+    # Python 3
+    def iitems(d):
+        """Produce the items from dict `d`."""
+        return d.items()
+
+    def litems(d):
+        """Return a list of items from dict `d`."""
+        return list(d.items())
+else:
+    # Python 2
+    def iitems(d):
+        """Produce the items from dict `d`."""
+        return d.iteritems()
+
+    def litems(d):
+        """Return a list of items from dict `d`."""
+        return d.items()
+
+# Getting the `next` function from an iterator is different in 2 and 3.
+try:
+    iter([]).next
+except AttributeError:
+    def iternext(seq):
+        """Get the `next` function for iterating over `seq`."""
+        return iter(seq).__next__
+else:
+    def iternext(seq):
+        """Get the `next` function for iterating over `seq`."""
+        return iter(seq).next
+
+# Python 3.x is picky about bytes and strings, so provide methods to
+# get them right, and make them no-ops in 2.x
+if env.PY3:
+    def to_bytes(s):
+        """Convert string `s` to bytes."""
+        return s.encode('utf8')
+
+    def to_string(b):
+        """Convert bytes `b` to string."""
+        return b.decode('utf8')
+
+    def binary_bytes(byte_values):
+        """Produce a byte string with the ints from `byte_values`."""
+        return bytes(byte_values)
+
+    def byte_to_int(byte):
+        """Turn a byte indexed from a bytes object into an int."""
+        return byte
+
+    def bytes_to_ints(bytes_value):
+        """Turn a bytes object into a sequence of ints."""
+        # In Python 3, iterating bytes gives ints.
+        return bytes_value
+
+else:
+    def to_bytes(s):
+        """Convert string `s` to bytes (no-op in 2.x)."""
+        return s
+
+    def to_string(b):
+        """Convert bytes `b` to string."""
+        return b
+
+    def binary_bytes(byte_values):
+        """Produce a byte string with the ints from `byte_values`."""
+        return "".join(chr(b) for b in byte_values)
+
+    def byte_to_int(byte):
+        """Turn a byte indexed from a bytes object into an int."""
+        return ord(byte)
+
+    def bytes_to_ints(bytes_value):
+        """Turn a bytes object into a sequence of ints."""
+        for byte in bytes_value:
+            yield ord(byte)
+
+
+try:
+    # In Python 2.x, the builtins were in __builtin__
+    BUILTINS = sys.modules['__builtin__']
+except KeyError:
+    # In Python 3.x, they're in builtins
+    BUILTINS = sys.modules['builtins']
+
+
+# imp was deprecated in Python 3.3
+try:
+    import importlib
+    import importlib.util
+    imp = None
+except ImportError:
+    importlib = None
+
+# We only want to use importlib if it has everything we need.
+try:
+    importlib_util_find_spec = importlib.util.find_spec
+except Exception:
+    import imp
+    importlib_util_find_spec = None
+
+# What is the .pyc magic number for this version of Python?
+try:
+    PYC_MAGIC_NUMBER = importlib.util.MAGIC_NUMBER
+except AttributeError:
+    PYC_MAGIC_NUMBER = imp.get_magic()
+
+
+def code_object(fn):
+    """Get the code object from a function."""
+    try:
+        return fn.func_code
+    except AttributeError:
+        return fn.__code__
+
+
+try:
+    from types import SimpleNamespace
+except ImportError:
+    # The code from https://docs.python.org/3/library/types.html#types.SimpleNamespace
+    class SimpleNamespace:
+        """Python implementation of SimpleNamespace, for Python 2."""
+        def __init__(self, **kwargs):
+            self.__dict__.update(kwargs)
+
+        def __repr__(self):
+            keys = sorted(self.__dict__)
+            items = ("{}={!r}".format(k, self.__dict__[k]) for k in keys)
+            return "{}({})".format(type(self).__name__, ", ".join(items))
+
+
+def format_local_datetime(dt):
+    """Return a string with local timezone representing the date.
+    If python version is lower than 3.6, the time zone is not included.
+    """
+    try:
+        return dt.astimezone().strftime('%Y-%m-%d %H:%M %z')
+    except (TypeError, ValueError):
+        # Datetime.astimezone in Python 3.5 can not handle naive datetime
+        return dt.strftime('%Y-%m-%d %H:%M')
+
+
+def invalidate_import_caches():
+    """Invalidate any import caches that may or may not exist."""
+    if importlib and hasattr(importlib, "invalidate_caches"):
+        importlib.invalidate_caches()
+
+
+def import_local_file(modname, modfile=None):
+    """Import a local file as a module.
+
+    Opens a file in the current directory named `modname`.py, imports it
+    as `modname`, and returns the module object.  `modfile` is the file to
+    import if it isn't in the current directory.
+
+    """
+    try:
+        import importlib.util as importlib_util
+    except ImportError:
+        importlib_util = None
+
+    if modfile is None:
+        modfile = modname + '.py'
+    if importlib_util:
+        spec = importlib_util.spec_from_file_location(modname, modfile)
+        mod = importlib_util.module_from_spec(spec)
+        sys.modules[modname] = mod
+        spec.loader.exec_module(mod)
+    else:
+        for suff in imp.get_suffixes():                 # pragma: part covered
+            if suff[0] == '.py':
+                break
+
+        with open(modfile, 'r') as f:
+            # pylint: disable=undefined-loop-variable
+            mod = imp.load_module(modname, f, modfile, suff)
+
+    return mod
diff --git a/contrib/python/coverage/py3/coverage/bytecode.py b/contrib/python/coverage/py3/coverage/bytecode.py
new file mode 100644
index 0000000000..ceb18cf374
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/bytecode.py
@@ -0,0 +1,19 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Bytecode manipulation for coverage.py"""
+
+import types
+
+
+def code_objects(code):
+    """Iterate over all the code objects in `code`."""
+    stack = [code]
+    while stack:
+        # We're going to return the code object on the stack, but first
+        # push its children for later returning.
+        code = stack.pop()
+        for c in code.co_consts:
+            if isinstance(c, types.CodeType):
+                stack.append(c)
+        yield code
diff --git a/contrib/python/coverage/py3/coverage/cmdline.py b/contrib/python/coverage/py3/coverage/cmdline.py
new file mode 100644
index 0000000000..0be0cca19f
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/cmdline.py
@@ -0,0 +1,910 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Command-line support for coverage.py."""
+
+from __future__ import print_function
+
+import glob
+import optparse
+import os.path
+import shlex
+import sys
+import textwrap
+import traceback
+
+import coverage
+from coverage import Coverage
+from coverage import env
+from coverage.collector import CTracer
+from coverage.data import line_counts
+from coverage.debug import info_formatter, info_header, short_stack
+from coverage.execfile import PyRunner
+from coverage.misc import BaseCoverageException, ExceptionDuringRun, NoSource, output_encoding
+from coverage.results import should_fail_under
+
+
+class Opts(object):
+    """A namespace class for individual options we'll build parsers from."""
+
+    append = optparse.make_option(
+        '-a', '--append', action='store_true',
+        help="Append coverage data to .coverage, otherwise it starts clean each time.",
+    )
+    keep = optparse.make_option(
+        '', '--keep', action='store_true',
+        help="Keep original coverage files, otherwise they are deleted.",
+    )
+    branch = optparse.make_option(
+        '', '--branch', action='store_true',
+        help="Measure branch coverage in addition to statement coverage.",
+    )
+    CONCURRENCY_CHOICES = [
+        "thread", "gevent", "greenlet", "eventlet", "multiprocessing",
+    ]
+    concurrency = optparse.make_option(
+        '', '--concurrency', action='store', metavar="LIB",
+        choices=CONCURRENCY_CHOICES,
+        help=(
+            "Properly measure code using a concurrency library. "
+            "Valid values are: %s."
+        ) % ", ".join(CONCURRENCY_CHOICES),
+    )
+    context = optparse.make_option(
+        '', '--context', action='store', metavar="LABEL",
+        help="The context label to record for this coverage run.",
+    )
+    debug = optparse.make_option(
+        '', '--debug', action='store', metavar="OPTS",
+        help="Debug options, separated by commas. [env: COVERAGE_DEBUG]",
+    )
+    directory = optparse.make_option(
+        '-d', '--directory', action='store', metavar="DIR",
+        help="Write the output files to DIR.",
+    )
+    fail_under = optparse.make_option(
+        '', '--fail-under', action='store', metavar="MIN", type="float",
+        help="Exit with a status of 2 if the total coverage is less than MIN.",
+    )
+    help = optparse.make_option(
+        '-h', '--help', action='store_true',
+        help="Get help on this command.",
+    )
+    ignore_errors = optparse.make_option(
+        '-i', '--ignore-errors', action='store_true',
+        help="Ignore errors while reading source files.",
+    )
+    include = optparse.make_option(
+        '', '--include', action='store',
+        metavar="PAT1,PAT2,...",
+        help=(
+            "Include only files whose paths match one of these patterns. "
+            "Accepts shell-style wildcards, which must be quoted."
+        ),
+    )
+    pylib = optparse.make_option(
+        '-L', '--pylib', action='store_true',
+        help=(
+            "Measure coverage even inside the Python installed library, "
+            "which isn't done by default."
+        ),
+    )
+    sort = optparse.make_option(
+        '--sort', action='store', metavar='COLUMN',
+        help="Sort the report by the named column: name, stmts, miss, branch, brpart, or cover. "
+             "Default is name."
+    )
+    show_missing = optparse.make_option(
+        '-m', '--show-missing', action='store_true',
+        help="Show line numbers of statements in each module that weren't executed.",
+    )
+    skip_covered = optparse.make_option(
+        '--skip-covered', action='store_true',
+        help="Skip files with 100% coverage.",
+    )
+    no_skip_covered = optparse.make_option(
+        '--no-skip-covered', action='store_false', dest='skip_covered',
+        help="Disable --skip-covered.",
+    )
+    skip_empty = optparse.make_option(
+        '--skip-empty', action='store_true',
+        help="Skip files with no code.",
+    )
+    show_contexts = optparse.make_option(
+        '--show-contexts', action='store_true',
+        help="Show contexts for covered lines.",
+    )
+    omit = optparse.make_option(
+        '', '--omit', action='store',
+        metavar="PAT1,PAT2,...",
+        help=(
+            "Omit files whose paths match one of these patterns. "
+            "Accepts shell-style wildcards, which must be quoted."
+        ),
+    )
+    contexts = optparse.make_option(
+        '', '--contexts', action='store',
+        metavar="REGEX1,REGEX2,...",
+        help=(
+            "Only display data from lines covered in the given contexts. "
+            "Accepts Python regexes, which must be quoted."
+        ),
+    )
+    output_xml = optparse.make_option(
+        '-o', '', action='store', dest="outfile",
+        metavar="OUTFILE",
+        help="Write the XML report to this file. Defaults to 'coverage.xml'",
+    )
+    output_json = optparse.make_option(
+        '-o', '', action='store', dest="outfile",
+        metavar="OUTFILE",
+        help="Write the JSON report to this file. Defaults to 'coverage.json'",
+    )
+    json_pretty_print = optparse.make_option(
+        '', '--pretty-print', action='store_true',
+        help="Format the JSON for human readers.",
+    )
+    parallel_mode = optparse.make_option(
+        '-p', '--parallel-mode', action='store_true',
+        help=(
+            "Append the machine name, process id and random number to the "
+            ".coverage data file name to simplify collecting data from "
+            "many processes."
+        ),
+    )
+    module = optparse.make_option(
+        '-m', '--module', action='store_true',
+        help=(
+            "<pyfile> is an importable Python module, not a script path, "
+            "to be run as 'python -m' would run it."
+        ),
+    )
+    precision = optparse.make_option(
+        '', '--precision', action='store', metavar='N', type=int,
+        help=(
+            "Number of digits after the decimal point to display for "
+            "reported coverage percentages."
+        ),
+    )
+    rcfile = optparse.make_option(
+        '', '--rcfile', action='store',
+        help=(
+            "Specify configuration file. "
+            "By default '.coveragerc', 'setup.cfg', 'tox.ini', and "
+            "'pyproject.toml' are tried. [env: COVERAGE_RCFILE]"
+        ),
+    )
+    source = optparse.make_option(
+        '', '--source', action='store', metavar="SRC1,SRC2,...",
+        help="A list of packages or directories of code to be measured.",
+    )
+    timid = optparse.make_option(
+        '', '--timid', action='store_true',
+        help=(
+            "Use a simpler but slower trace method. Try this if you get "
+            "seemingly impossible results!"
+        ),
+    )
+    title = optparse.make_option(
+        '', '--title', action='store', metavar="TITLE",
+        help="A text string to use as the title on the HTML.",
+    )
+    version = optparse.make_option(
+        '', '--version', action='store_true',
+        help="Display version information and exit.",
+    )
+
+
+class CoverageOptionParser(optparse.OptionParser, object):
+    """Base OptionParser for coverage.py.
+
+    Problems don't exit the program.
+    Defaults are initialized for all options.
+
+    """
+
+    def __init__(self, *args, **kwargs):
+        super(CoverageOptionParser, self).__init__(
+            add_help_option=False, *args, **kwargs
+            )
+        self.set_defaults(
+            action=None,
+            append=None,
+            branch=None,
+            concurrency=None,
+            context=None,
+            debug=None,
+            directory=None,
+            fail_under=None,
+            help=None,
+            ignore_errors=None,
+            include=None,
+            keep=None,
+            module=None,
+            omit=None,
+            contexts=None,
+            parallel_mode=None,
+            precision=None,
+            pylib=None,
+            rcfile=True,
+            show_missing=None,
+            skip_covered=None,
+            skip_empty=None,
+            show_contexts=None,
+            sort=None,
+            source=None,
+            timid=None,
+            title=None,
+            version=None,
+            )
+
+        self.disable_interspersed_args()
+
+    class OptionParserError(Exception):
+        """Used to stop the optparse error handler ending the process."""
+        pass
+
+    def parse_args_ok(self, args=None, options=None):
+        """Call optparse.parse_args, but return a triple:
+
+        (ok, options, args)
+
+        """
+        try:
+            options, args = super(CoverageOptionParser, self).parse_args(args, options)
+        except self.OptionParserError:
+            return False, None, None
+        return True, options, args
+
+    def error(self, msg):
+        """Override optparse.error so sys.exit doesn't get called."""
+        show_help(msg)
+        raise self.OptionParserError
+
+
+class GlobalOptionParser(CoverageOptionParser):
+    """Command-line parser for coverage.py global option arguments."""
+
+    def __init__(self):
+        super(GlobalOptionParser, self).__init__()
+
+        self.add_options([
+            Opts.help,
+            Opts.version,
+        ])
+
+
+class CmdOptionParser(CoverageOptionParser):
+    """Parse one of the new-style commands for coverage.py."""
+
+    def __init__(self, action, options, defaults=None, usage=None, description=None):
+        """Create an OptionParser for a coverage.py command.
+
+        `action` is the slug to put into `options.action`.
+        `options` is a list of Option's for the command.
+        `defaults` is a dict of default value for options.
+        `usage` is the usage string to display in help.
+        `description` is the description of the command, for the help text.
+
+        """
+        if usage:
+            usage = "%prog " + usage
+        super(CmdOptionParser, self).__init__(
+            usage=usage,
+            description=description,
+        )
+        self.set_defaults(action=action, **(defaults or {}))
+        self.add_options(options)
+        self.cmd = action
+
+    def __eq__(self, other):
+        # A convenience equality, so that I can put strings in unit test
+        # results, and they will compare equal to objects.
+        return (other == "<CmdOptionParser:%s>" % self.cmd)
+
+    __hash__ = None     # This object doesn't need to be hashed.
+
+    def get_prog_name(self):
+        """Override of an undocumented function in optparse.OptionParser."""
+        program_name = super(CmdOptionParser, self).get_prog_name()
+
+        # Include the sub-command for this parser as part of the command.
+        return "{command} {subcommand}".format(command=program_name, subcommand=self.cmd)
+
+
+GLOBAL_ARGS = [
+    Opts.debug,
+    Opts.help,
+    Opts.rcfile,
+    ]
+
+CMDS = {
+    'annotate': CmdOptionParser(
+        "annotate",
+        [
+            Opts.directory,
+            Opts.ignore_errors,
+            Opts.include,
+            Opts.omit,
+            ] + GLOBAL_ARGS,
+        usage="[options] [modules]",
+        description=(
+            "Make annotated copies of the given files, marking statements that are executed "
+            "with > and statements that are missed with !."
+        ),
+    ),
+
+    'combine': CmdOptionParser(
+        "combine",
+        [
+            Opts.append,
+            Opts.keep,
+            ] + GLOBAL_ARGS,
+        usage="[options] <path1> <path2> ... <pathN>",
+        description=(
+            "Combine data from multiple coverage files collected "
+            "with 'run -p'.  The combined results are written to a single "
+            "file representing the union of the data. The positional "
+            "arguments are data files or directories containing data files. "
+            "If no paths are provided, data files in the default data file's "
+            "directory are combined."
+        ),
+    ),
+
+    'debug': CmdOptionParser(
+        "debug", GLOBAL_ARGS,
+        usage="<topic>",
+        description=(
+            "Display information about the internals of coverage.py, "
+            "for diagnosing problems. "
+            "Topics are: "
+                "'data' to show a summary of the collected data; "
+                "'sys' to show installation information; "
+                "'config' to show the configuration; "
+                "'premain' to show what is calling coverage."
+        ),
+    ),
+
+    'erase': CmdOptionParser(
+        "erase", GLOBAL_ARGS,
+        description="Erase previously collected coverage data.",
+    ),
+
+    'help': CmdOptionParser(
+        "help", GLOBAL_ARGS,
+        usage="[command]",
+        description="Describe how to use coverage.py",
+    ),
+
+    'html': CmdOptionParser(
+        "html",
+        [
+            Opts.contexts,
+            Opts.directory,
+            Opts.fail_under,
+            Opts.ignore_errors,
+            Opts.include,
+            Opts.omit,
+            Opts.precision,
+            Opts.show_contexts,
+            Opts.skip_covered,
+            Opts.no_skip_covered,
+            Opts.skip_empty,
+            Opts.title,
+            ] + GLOBAL_ARGS,
+        usage="[options] [modules]",
+        description=(
+            "Create an HTML report of the coverage of the files.  "
+            "Each file gets its own page, with the source decorated to show "
+            "executed, excluded, and missed lines."
+        ),
+    ),
+
+    'json': CmdOptionParser(
+        "json",
+        [
+            Opts.contexts,
+            Opts.fail_under,
+            Opts.ignore_errors,
+            Opts.include,
+            Opts.omit,
+            Opts.output_json,
+            Opts.json_pretty_print,
+            Opts.show_contexts,
+            ] + GLOBAL_ARGS,
+        usage="[options] [modules]",
+        description="Generate a JSON report of coverage results."
+    ),
+
+    'report': CmdOptionParser(
+        "report",
+        [
+            Opts.contexts,
+            Opts.fail_under,
+            Opts.ignore_errors,
+            Opts.include,
+            Opts.omit,
+            Opts.precision,
+            Opts.sort,
+            Opts.show_missing,
+            Opts.skip_covered,
+            Opts.no_skip_covered,
+            Opts.skip_empty,
+            ] + GLOBAL_ARGS,
+        usage="[options] [modules]",
+        description="Report coverage statistics on modules."
+    ),
+
+    'run': CmdOptionParser(
+        "run",
+        [
+            Opts.append,
+            Opts.branch,
+            Opts.concurrency,
+            Opts.context,
+            Opts.include,
+            Opts.module,
+            Opts.omit,
+            Opts.pylib,
+            Opts.parallel_mode,
+            Opts.source,
+            Opts.timid,
+            ] + GLOBAL_ARGS,
+        usage="[options] <pyfile> [program options]",
+        description="Run a Python program, measuring code execution."
+    ),
+
+    'xml': CmdOptionParser(
+        "xml",
+        [
+            Opts.fail_under,
+            Opts.ignore_errors,
+            Opts.include,
+            Opts.omit,
+            Opts.output_xml,
+            Opts.skip_empty,
+            ] + GLOBAL_ARGS,
+        usage="[options] [modules]",
+        description="Generate an XML report of coverage results."
+    ),
+}
+
+
+def show_help(error=None, topic=None, parser=None):
+    """Display an error message, or the named topic."""
+    assert error or topic or parser
+
+    program_path = sys.argv[0]
+    if program_path.endswith(os.path.sep + '__main__.py'):
+        # The path is the main module of a package; get that path instead.
+        program_path = os.path.dirname(program_path)
+    program_name = os.path.basename(program_path)
+    if env.WINDOWS:
+        # entry_points={'console_scripts':...} on Windows makes files
+        # called coverage.exe, coverage3.exe, and coverage-3.5.exe. These
+        # invoke coverage-script.py, coverage3-script.py, and
+        # coverage-3.5-script.py.  argv[0] is the .py file, but we want to
+        # get back to the original form.
+        auto_suffix = "-script.py"
+        if program_name.endswith(auto_suffix):
+            program_name = program_name[:-len(auto_suffix)]
+
+    help_params = dict(coverage.__dict__)
+    help_params['program_name'] = program_name
+    if CTracer is not None:
+        help_params['extension_modifier'] = 'with C extension'
+    else:
+        help_params['extension_modifier'] = 'without C extension'
+
+    if error:
+        print(error, file=sys.stderr)
+        print("Use '%s help' for help." % (program_name,), file=sys.stderr)
+    elif parser:
+        print(parser.format_help().strip())
+        print()
+    else:
+        help_msg = textwrap.dedent(HELP_TOPICS.get(topic, '')).strip()
+        if help_msg:
+            print(help_msg.format(**help_params))
+        else:
+            print("Don't know topic %r" % topic)
+    print("Full documentation is at {__url__}".format(**help_params))
+
+
+OK, ERR, FAIL_UNDER = 0, 1, 2
+
+
+class CoverageScript(object):
+    """The command-line interface to coverage.py."""
+
+    def __init__(self):
+        self.global_option = False
+        self.coverage = None
+
+    def command_line(self, argv):
+        """The bulk of the command line interface to coverage.py.
+
+        `argv` is the argument list to process.
+
+        Returns 0 if all is well, 1 if something went wrong.
+
+        """
+        # Collect the command-line options.
+        if not argv:
+            show_help(topic='minimum_help')
+            return OK
+
+        # The command syntax we parse depends on the first argument.  Global
+        # switch syntax always starts with an option.
+        self.global_option = argv[0].startswith('-')
+        if self.global_option:
+            parser = GlobalOptionParser()
+        else:
+            parser = CMDS.get(argv[0])
+            if not parser:
+                show_help("Unknown command: '%s'" % argv[0])
+                return ERR
+            argv = argv[1:]
+
+        ok, options, args = parser.parse_args_ok(argv)
+        if not ok:
+            return ERR
+
+        # Handle help and version.
+        if self.do_help(options, args, parser):
+            return OK
+
+        # Listify the list options.
+        source = unshell_list(options.source)
+        omit = unshell_list(options.omit)
+        include = unshell_list(options.include)
+        debug = unshell_list(options.debug)
+        contexts = unshell_list(options.contexts)
+
+        # Do something.
+        self.coverage = Coverage(
+            data_suffix=options.parallel_mode,
+            cover_pylib=options.pylib,
+            timid=options.timid,
+            branch=options.branch,
+            config_file=options.rcfile,
+            source=source,
+            omit=omit,
+            include=include,
+            debug=debug,
+            concurrency=options.concurrency,
+            check_preimported=True,
+            context=options.context,
+            )
+
+        if options.action == "debug":
+            return self.do_debug(args)
+
+        elif options.action == "erase":
+            self.coverage.erase()
+            return OK
+
+        elif options.action == "run":
+            return self.do_run(options, args)
+
+        elif options.action == "combine":
+            if options.append:
+                self.coverage.load()
+            data_dirs = args or None
+            self.coverage.combine(data_dirs, strict=True, keep=bool(options.keep))
+            self.coverage.save()
+            return OK
+
+        # Remaining actions are reporting, with some common options.
+        report_args = dict(
+            morfs=unglob_args(args),
+            ignore_errors=options.ignore_errors,
+            omit=omit,
+            include=include,
+            contexts=contexts,
+            )
+
+        # We need to be able to import from the current directory, because
+        # plugins may try to, for example, to read Django settings.
+        sys.path.insert(0, '')
+
+        self.coverage.load()
+
+        total = None
+        if options.action == "report":
+            total = self.coverage.report(
+                show_missing=options.show_missing,
+                skip_covered=options.skip_covered,
+                skip_empty=options.skip_empty,
+                precision=options.precision,
+                sort=options.sort,
+                **report_args
+                )
+        elif options.action == "annotate":
+            self.coverage.annotate(directory=options.directory, **report_args)
+        elif options.action == "html":
+            total = self.coverage.html_report(
+                directory=options.directory,
+                title=options.title,
+                skip_covered=options.skip_covered,
+                skip_empty=options.skip_empty,
+                show_contexts=options.show_contexts,
+                precision=options.precision,
+                **report_args
+                )
+        elif options.action == "xml":
+            outfile = options.outfile
+            total = self.coverage.xml_report(
+                outfile=outfile, skip_empty=options.skip_empty,
+                **report_args
+                )
+        elif options.action == "json":
+            outfile = options.outfile
+            total = self.coverage.json_report(
+                outfile=outfile,
+                pretty_print=options.pretty_print,
+                show_contexts=options.show_contexts,
+                **report_args
+            )
+
+        if total is not None:
+            # Apply the command line fail-under options, and then use the config
+            # value, so we can get fail_under from the config file.
+            if options.fail_under is not None:
+                self.coverage.set_option("report:fail_under", options.fail_under)
+
+            fail_under = self.coverage.get_option("report:fail_under")
+            precision = self.coverage.get_option("report:precision")
+            if should_fail_under(total, fail_under, precision):
+                msg = "total of {total:.{p}f} is less than fail-under={fail_under:.{p}f}".format(
+                    total=total, fail_under=fail_under, p=precision,
+                )
+                print("Coverage failure:", msg)
+                return FAIL_UNDER
+
+        return OK
+
+    def do_help(self, options, args, parser):
+        """Deal with help requests.
+
+        Return True if it handled the request, False if not.
+
+        """
+        # Handle help.
+        if options.help:
+            if self.global_option:
+                show_help(topic='help')
+            else:
+                show_help(parser=parser)
+            return True
+
+        if options.action == "help":
+            if args:
+                for a in args:
+                    parser = CMDS.get(a)
+                    if parser:
+                        show_help(parser=parser)
+                    else:
+                        show_help(topic=a)
+            else:
+                show_help(topic='help')
+            return True
+
+        # Handle version.
+        if options.version:
+            show_help(topic='version')
+            return True
+
+        return False
+
+    def do_run(self, options, args):
+        """Implementation of 'coverage run'."""
+
+        if not args:
+            if options.module:
+                # Specified -m with nothing else.
+                show_help("No module specified for -m")
+                return ERR
+            command_line = self.coverage.get_option("run:command_line")
+            if command_line is not None:
+                args = shlex.split(command_line)
+                if args and args[0] == "-m":
+                    options.module = True
+                    args = args[1:]
+        if not args:
+            show_help("Nothing to do.")
+            return ERR
+
+        if options.append and self.coverage.get_option("run:parallel"):
+            show_help("Can't append to data files in parallel mode.")
+            return ERR
+
+        if options.concurrency == "multiprocessing":
+            # Can't set other run-affecting command line options with
+            # multiprocessing.
+            for opt_name in ['branch', 'include', 'omit', 'pylib', 'source', 'timid']:
+                # As it happens, all of these options have no default, meaning
+                # they will be None if they have not been specified.
+                if getattr(options, opt_name) is not None:
+                    show_help(
+                        "Options affecting multiprocessing must only be specified "
+                        "in a configuration file.\n"
+                        "Remove --{} from the command line.".format(opt_name)
+                    )
+                    return ERR
+
+        runner = PyRunner(args, as_module=bool(options.module))
+        runner.prepare()
+
+        if options.append:
+            self.coverage.load()
+
+        # Run the script.
+        self.coverage.start()
+        code_ran = True
+        try:
+            runner.run()
+        except NoSource:
+            code_ran = False
+            raise
+        finally:
+            self.coverage.stop()
+            if code_ran:
+                self.coverage.save()
+
+        return OK
+
+    def do_debug(self, args):
+        """Implementation of 'coverage debug'."""
+
+        if not args:
+            show_help("What information would you like: config, data, sys, premain?")
+            return ERR
+
+        for info in args:
+            if info == 'sys':
+                sys_info = self.coverage.sys_info()
+                print(info_header("sys"))
+                for line in info_formatter(sys_info):
+                    print(" %s" % line)
+            elif info == 'data':
+                self.coverage.load()
+                data = self.coverage.get_data()
+                print(info_header("data"))
+                print("path: %s" % data.data_filename())
+                if data:
+                    print("has_arcs: %r" % data.has_arcs())
+                    summary = line_counts(data, fullpath=True)
+                    filenames = sorted(summary.keys())
+                    print("\n%d files:" % len(filenames))
+                    for f in filenames:
+                        line = "%s: %d lines" % (f, summary[f])
+                        plugin = data.file_tracer(f)
+                        if plugin:
+                            line += " [%s]" % plugin
+                        print(line)
+                else:
+                    print("No data collected")
+            elif info == 'config':
+                print(info_header("config"))
+                config_info = self.coverage.config.__dict__.items()
+                for line in info_formatter(config_info):
+                    print(" %s" % line)
+            elif info == "premain":
+                print(info_header("premain"))
+                print(short_stack())
+            else:
+                show_help("Don't know what you mean by %r" % info)
+                return ERR
+
+        return OK
+
+
+def unshell_list(s):
+    """Turn a command-line argument into a list."""
+    if not s:
+        return None
+    if env.WINDOWS:
+        # When running coverage.py as coverage.exe, some of the behavior
+        # of the shell is emulated: wildcards are expanded into a list of
+        # file names.  So you have to single-quote patterns on the command
+        # line, but (not) helpfully, the single quotes are included in the
+        # argument, so we have to strip them off here.
+        s = s.strip("'")
+    return s.split(',')
+
+
+def unglob_args(args):
+    """Interpret shell wildcards for platforms that need it."""
+    if env.WINDOWS:
+        globbed = []
+        for arg in args:
+            if '?' in arg or '*' in arg:
+                globbed.extend(glob.glob(arg))
+            else:
+                globbed.append(arg)
+        args = globbed
+    return args
+
+
+HELP_TOPICS = {
+    'help': """\
+        Coverage.py, version {__version__} {extension_modifier}
+        Measure, collect, and report on code coverage in Python programs.
+
+        usage: {program_name} <command> [options] [args]
+
+        Commands:
+            annotate    Annotate source files with execution information.
+            combine     Combine a number of data files.
+            debug       Display information about the internals of coverage.py
+            erase       Erase previously collected coverage data.
+            help        Get help on using coverage.py.
+            html        Create an HTML report.
+            json        Create a JSON report of coverage results.
+            report      Report coverage stats on modules.
+            run         Run a Python program and measure code execution.
+            xml         Create an XML report of coverage results.
+
+        Use "{program_name} help <command>" for detailed help on any command.
+    """,
+
+    'minimum_help': """\
+        Code coverage for Python, version {__version__} {extension_modifier}.  Use '{program_name} help' for help.
+    """,
+
+    'version': """\
+        Coverage.py, version {__version__} {extension_modifier}
+    """,
+}
+
+
+def main(argv=None):
+    """The main entry point to coverage.py.
+
+    This is installed as the script entry point.
+
+    """
+    if argv is None:
+        argv = sys.argv[1:]
+    try:
+        status = CoverageScript().command_line(argv)
+    except ExceptionDuringRun as err:
+        # An exception was caught while running the product code.  The
+        # sys.exc_info() return tuple is packed into an ExceptionDuringRun
+        # exception.
+        traceback.print_exception(*err.args)    # pylint: disable=no-value-for-parameter
+        status = ERR
+    except BaseCoverageException as err:
+        # A controlled error inside coverage.py: print the message to the user.
+        msg = err.args[0]
+        if env.PY2:
+            msg = msg.encode(output_encoding())
+        print(msg)
+        status = ERR
+    except SystemExit as err:
+        # The user called `sys.exit()`.  Exit with their argument, if any.
+        if err.args:
+            status = err.args[0]
+        else:
+            status = None
+    return status
+
+# Profiling using ox_profile.  Install it from GitHub:
+#   pip install git+https://github.com/emin63/ox_profile.git
+#
+# $set_env.py: COVERAGE_PROFILE - Set to use ox_profile.
+_profile = os.environ.get("COVERAGE_PROFILE", "")
+if _profile:                                                # pragma: debugging
+    from ox_profile.core.launchers import SimpleLauncher    # pylint: disable=import-error
+    original_main = main
+
+    def main(argv=None):                                    # pylint: disable=function-redefined
+        """A wrapper around main that profiles."""
+        profiler = SimpleLauncher.launch()
+        try:
+            return original_main(argv)
+        finally:
+            data, _ = profiler.query(re_filter='coverage', max_records=100)
+            print(profiler.show(query=data, limit=100, sep='', col=''))
+            profiler.cancel()
diff --git a/contrib/python/coverage/py3/coverage/collector.py b/contrib/python/coverage/py3/coverage/collector.py
new file mode 100644
index 0000000000..c42d29feec
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/collector.py
@@ -0,0 +1,455 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Raw data collector for coverage.py."""
+
+import os
+import sys
+
+from coverage import env
+from coverage.backward import litems, range     # pylint: disable=redefined-builtin
+from coverage.debug import short_stack
+from coverage.disposition import FileDisposition
+from coverage.misc import CoverageException, isolate_module
+from coverage.pytracer import PyTracer
+
+os = isolate_module(os)
+
+
+try:
+    # Use the C extension code when we can, for speed.
+    from coverage.tracer import CTracer, CFileDisposition
+except ImportError:
+    # Couldn't import the C extension, maybe it isn't built.
+    if os.getenv('COVERAGE_TEST_TRACER') == 'c':
+        # During testing, we use the COVERAGE_TEST_TRACER environment variable
+        # to indicate that we've fiddled with the environment to test this
+        # fallback code.  If we thought we had a C tracer, but couldn't import
+        # it, then exit quickly and clearly instead of dribbling confusing
+        # errors. I'm using sys.exit here instead of an exception because an
+        # exception here causes all sorts of other noise in unittest.
+        sys.stderr.write("*** COVERAGE_TEST_TRACER is 'c' but can't import CTracer!\n")
+        sys.exit(1)
+    CTracer = None
+
+
+class Collector(object):
+    """Collects trace data.
+
+    Creates a Tracer object for each thread, since they track stack
+    information.  Each Tracer points to the same shared data, contributing
+    traced data points.
+
+    When the Collector is started, it creates a Tracer for the current thread,
+    and installs a function to create Tracers for each new thread started.
+    When the Collector is stopped, all active Tracers are stopped.
+
+    Threads started while the Collector is stopped will never have Tracers
+    associated with them.
+
+    """
+
+    # The stack of active Collectors.  Collectors are added here when started,
+    # and popped when stopped.  Collectors on the stack are paused when not
+    # the top, and resumed when they become the top again.
+    _collectors = []
+
+    # The concurrency settings we support here.
+    SUPPORTED_CONCURRENCIES = {"greenlet", "eventlet", "gevent", "thread"}
+
+    def __init__(
+        self, should_trace, check_include, should_start_context, file_mapper,
+        timid, branch, warn, concurrency,
+    ):
+        """Create a collector.
+
+        `should_trace` is a function, taking a file name and a frame, and
+        returning a `coverage.FileDisposition object`.
+
+        `check_include` is a function taking a file name and a frame. It returns
+        a boolean: True if the file should be traced, False if not.
+
+        `should_start_context` is a function taking a frame, and returning a
+        string. If the frame should be the start of a new context, the string
+        is the new context. If the frame should not be the start of a new
+        context, return None.
+
+        `file_mapper` is a function taking a filename, and returning a Unicode
+        filename.  The result is the name that will be recorded in the data
+        file.
+
+        If `timid` is true, then a slower simpler trace function will be
+        used.  This is important for some environments where manipulation of
+        tracing functions make the faster more sophisticated trace function not
+        operate properly.
+
+        If `branch` is true, then branches will be measured.  This involves
+        collecting data on which statements followed each other (arcs).  Use
+        `get_arc_data` to get the arc data.
+
+        `warn` is a warning function, taking a single string message argument
+        and an optional slug argument which will be a string or None, to be
+        used if a warning needs to be issued.
+
+        `concurrency` is a list of strings indicating the concurrency libraries
+        in use.  Valid values are "greenlet", "eventlet", "gevent", or "thread"
+        (the default).  Of these four values, only one can be supplied.  Other
+        values are ignored.
+
+        """
+        self.should_trace = should_trace
+        self.check_include = check_include
+        self.should_start_context = should_start_context
+        self.file_mapper = file_mapper
+        self.warn = warn
+        self.branch = branch
+        self.threading = None
+        self.covdata = None
+
+        self.static_context = None
+
+        self.origin = short_stack()
+
+        self.concur_id_func = None
+        self.mapped_file_cache = {}
+
+        # We can handle a few concurrency options here, but only one at a time.
+        these_concurrencies = self.SUPPORTED_CONCURRENCIES.intersection(concurrency)
+        if len(these_concurrencies) > 1:
+            raise CoverageException("Conflicting concurrency settings: %s" % concurrency)
+        self.concurrency = these_concurrencies.pop() if these_concurrencies else ''
+
+        try:
+            if self.concurrency == "greenlet":
+                import greenlet
+                self.concur_id_func = greenlet.getcurrent
+            elif self.concurrency == "eventlet":
+                import eventlet.greenthread     # pylint: disable=import-error,useless-suppression
+                self.concur_id_func = eventlet.greenthread.getcurrent
+            elif self.concurrency == "gevent":
+                import gevent                   # pylint: disable=import-error,useless-suppression
+                self.concur_id_func = gevent.getcurrent
+            elif self.concurrency == "thread" or not self.concurrency:
+                # It's important to import threading only if we need it.  If
+                # it's imported early, and the program being measured uses
+                # gevent, then gevent's monkey-patching won't work properly.
+                import threading
+                self.threading = threading
+            else:
+                raise CoverageException("Don't understand concurrency=%s" % concurrency)
+        except ImportError:
+            raise CoverageException(
+                "Couldn't trace with concurrency=%s, the module isn't installed." % (
+                    self.concurrency,
+                )
+            )
+
+        self.reset()
+
+        if timid:
+            # Being timid: use the simple Python trace function.
+            self._trace_class = PyTracer
+        else:
+            # Being fast: use the C Tracer if it is available, else the Python
+            # trace function.
+            self._trace_class = CTracer or PyTracer
+
+        if self._trace_class is CTracer:
+            self.file_disposition_class = CFileDisposition
+            self.supports_plugins = True
+        else:
+            self.file_disposition_class = FileDisposition
+            self.supports_plugins = False
+
+    def __repr__(self):
+        return "<Collector at 0x%x: %s>" % (id(self), self.tracer_name())
+
+    def use_data(self, covdata, context):
+        """Use `covdata` for recording data."""
+        self.covdata = covdata
+        self.static_context = context
+        self.covdata.set_context(self.static_context)
+
+    def tracer_name(self):
+        """Return the class name of the tracer we're using."""
+        return self._trace_class.__name__
+
+    def _clear_data(self):
+        """Clear out existing data, but stay ready for more collection."""
+        # We used to used self.data.clear(), but that would remove filename
+        # keys and data values that were still in use higher up the stack
+        # when we are called as part of switch_context.
+        for d in self.data.values():
+            d.clear()
+
+        for tracer in self.tracers:
+            tracer.reset_activity()
+
+    def reset(self):
+        """Clear collected data, and prepare to collect more."""
+        # A dictionary mapping file names to dicts with line number keys (if not
+        # branch coverage), or mapping file names to dicts with line number
+        # pairs as keys (if branch coverage).
+        self.data = {}
+
+        # A dictionary mapping file names to file tracer plugin names that will
+        # handle them.
+        self.file_tracers = {}
+
+        self.disabled_plugins = set()
+
+        # The .should_trace_cache attribute is a cache from file names to
+        # coverage.FileDisposition objects, or None.  When a file is first
+        # considered for tracing, a FileDisposition is obtained from
+        # Coverage.should_trace.  Its .trace attribute indicates whether the
+        # file should be traced or not.  If it should be, a plugin with dynamic
+        # file names can decide not to trace it based on the dynamic file name
+        # being excluded by the inclusion rules, in which case the
+        # FileDisposition will be replaced by None in the cache.
+        if env.PYPY:
+            import __pypy__                     # pylint: disable=import-error
+            # Alex Gaynor said:
+            # should_trace_cache is a strictly growing key: once a key is in
+            # it, it never changes.  Further, the keys used to access it are
+            # generally constant, given sufficient context. That is to say, at
+            # any given point _trace() is called, pypy is able to know the key.
+            # This is because the key is determined by the physical source code
+            # line, and that's invariant with the call site.
+            #
+            # This property of a dict with immutable keys, combined with
+            # call-site-constant keys is a match for PyPy's module dict,
+            # which is optimized for such workloads.
+            #
+            # This gives a 20% benefit on the workload described at
+            # https://bitbucket.org/pypy/pypy/issue/1871/10x-slower-than-cpython-under-coverage
+            self.should_trace_cache = __pypy__.newdict("module")
+        else:
+            self.should_trace_cache = {}
+
+        # Our active Tracers.
+        self.tracers = []
+
+        self._clear_data()
+
+    def _start_tracer(self):
+        """Start a new Tracer object, and store it in self.tracers."""
+        tracer = self._trace_class()
+        tracer.data = self.data
+        tracer.trace_arcs = self.branch
+        tracer.should_trace = self.should_trace
+        tracer.should_trace_cache = self.should_trace_cache
+        tracer.warn = self.warn
+
+        if hasattr(tracer, 'concur_id_func'):
+            tracer.concur_id_func = self.concur_id_func
+        elif self.concur_id_func:
+            raise CoverageException(
+                "Can't support concurrency=%s with %s, only threads are supported" % (
+                    self.concurrency, self.tracer_name(),
+                )
+            )
+
+        if hasattr(tracer, 'file_tracers'):
+            tracer.file_tracers = self.file_tracers
+        if hasattr(tracer, 'threading'):
+            tracer.threading = self.threading
+        if hasattr(tracer, 'check_include'):
+            tracer.check_include = self.check_include
+        if hasattr(tracer, 'should_start_context'):
+            tracer.should_start_context = self.should_start_context
+            tracer.switch_context = self.switch_context
+        if hasattr(tracer, 'disable_plugin'):
+            tracer.disable_plugin = self.disable_plugin
+
+        fn = tracer.start()
+        self.tracers.append(tracer)
+
+        return fn
+
+    # The trace function has to be set individually on each thread before
+    # execution begins.  Ironically, the only support the threading module has
+    # for running code before the thread main is the tracing function.  So we
+    # install this as a trace function, and the first time it's called, it does
+    # the real trace installation.
+
+    def _installation_trace(self, frame, event, arg):
+        """Called on new threads, installs the real tracer."""
+        # Remove ourselves as the trace function.
+        sys.settrace(None)
+        # Install the real tracer.
+        fn = self._start_tracer()
+        # Invoke the real trace function with the current event, to be sure
+        # not to lose an event.
+        if fn:
+            fn = fn(frame, event, arg)
+        # Return the new trace function to continue tracing in this scope.
+        return fn
+
+    def start(self):
+        """Start collecting trace information."""
+        if self._collectors:
+            self._collectors[-1].pause()
+
+        self.tracers = []
+
+        # Check to see whether we had a fullcoverage tracer installed. If so,
+        # get the stack frames it stashed away for us.
+        traces0 = []
+        fn0 = sys.gettrace()
+        if fn0:
+            tracer0 = getattr(fn0, '__self__', None)
+            if tracer0:
+                traces0 = getattr(tracer0, 'traces', [])
+
+        try:
+            # Install the tracer on this thread.
+            fn = self._start_tracer()
+        except:
+            if self._collectors:
+                self._collectors[-1].resume()
+            raise
+
+        # If _start_tracer succeeded, then we add ourselves to the global
+        # stack of collectors.
+        self._collectors.append(self)
+
+        # Replay all the events from fullcoverage into the new trace function.
+        for args in traces0:
+            (frame, event, arg), lineno = args
+            try:
+                fn(frame, event, arg, lineno=lineno)
+            except TypeError:
+                raise Exception("fullcoverage must be run with the C trace function.")
+
+        # Install our installation tracer in threading, to jump-start other
+        # threads.
+        if self.threading:
+            self.threading.settrace(self._installation_trace)
+
+    def stop(self):
+        """Stop collecting trace information."""
+        assert self._collectors
+        if self._collectors[-1] is not self:
+            print("self._collectors:")
+            for c in self._collectors:
+                print("  {!r}\n{}".format(c, c.origin))
+        assert self._collectors[-1] is self, (
+            "Expected current collector to be %r, but it's %r" % (self, self._collectors[-1])
+        )
+
+        self.pause()
+
+        # Remove this Collector from the stack, and resume the one underneath
+        # (if any).
+        self._collectors.pop()
+        if self._collectors:
+            self._collectors[-1].resume()
+
+    def pause(self):
+        """Pause tracing, but be prepared to `resume`."""
+        for tracer in self.tracers:
+            tracer.stop()
+            stats = tracer.get_stats()
+            if stats:
+                print("\nCoverage.py tracer stats:")
+                for k in sorted(stats.keys()):
+                    print("%20s: %s" % (k, stats[k]))
+        if self.threading:
+            self.threading.settrace(None)
+
+    def resume(self):
+        """Resume tracing after a `pause`."""
+        for tracer in self.tracers:
+            tracer.start()
+        if self.threading:
+            self.threading.settrace(self._installation_trace)
+        else:
+            self._start_tracer()
+
+    def _activity(self):
+        """Has any activity been traced?
+
+        Returns a boolean, True if any trace function was invoked.
+
+        """
+        return any(tracer.activity() for tracer in self.tracers)
+
+    def switch_context(self, new_context):
+        """Switch to a new dynamic context."""
+        self.flush_data()
+        if self.static_context:
+            context = self.static_context
+            if new_context:
+                context += "|" + new_context
+        else:
+            context = new_context
+        self.covdata.set_context(context)
+
+    def disable_plugin(self, disposition):
+        """Disable the plugin mentioned in `disposition`."""
+        file_tracer = disposition.file_tracer
+        plugin = file_tracer._coverage_plugin
+        plugin_name = plugin._coverage_plugin_name
+        self.warn("Disabling plug-in {!r} due to previous exception".format(plugin_name))
+        plugin._coverage_enabled = False
+        disposition.trace = False
+
+    def cached_mapped_file(self, filename):
+        """A locally cached version of file names mapped through file_mapper."""
+        key = (type(filename), filename)
+        try:
+            return self.mapped_file_cache[key]
+        except KeyError:
+            return self.mapped_file_cache.setdefault(key, self.file_mapper(filename))
+
+    def mapped_file_dict(self, d):
+        """Return a dict like d, but with keys modified by file_mapper."""
+        # The call to litems() ensures that the GIL protects the dictionary
+        # iterator against concurrent modifications by tracers running
+        # in other threads. We try three times in case of concurrent
+        # access, hoping to get a clean copy.
+        runtime_err = None
+        for _ in range(3):
+            try:
+                items = litems(d)
+            except RuntimeError as ex:
+                runtime_err = ex
+            else:
+                break
+        else:
+            raise runtime_err
+
+        if getattr(sys, 'is_standalone_binary', False):
+            # filenames should stay relative to the arcadia root, because files may not exist
+            return dict((k, v) for k, v in items if v)
+
+        return dict((self.cached_mapped_file(k), v) for k, v in items if v)
+
+    def plugin_was_disabled(self, plugin):
+        """Record that `plugin` was disabled during the run."""
+        self.disabled_plugins.add(plugin._coverage_plugin_name)
+
+    def flush_data(self):
+        """Save the collected data to our associated `CoverageData`.
+
+        Data may have also been saved along the way. This forces the
+        last of the data to be saved.
+
+        Returns True if there was data to save, False if not.
+        """
+        if not self._activity():
+            return False
+
+        if self.branch:
+            self.covdata.add_arcs(self.mapped_file_dict(self.data))
+        else:
+            self.covdata.add_lines(self.mapped_file_dict(self.data))
+
+        file_tracers = {
+            k: v for k, v in self.file_tracers.items()
+            if v not in self.disabled_plugins
+        }
+        self.covdata.add_file_tracers(self.mapped_file_dict(file_tracers))
+
+        self._clear_data()
+        return True
diff --git a/contrib/python/coverage/py3/coverage/config.py b/contrib/python/coverage/py3/coverage/config.py
new file mode 100644
index 0000000000..ceb7201b65
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/config.py
@@ -0,0 +1,605 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Config file for coverage.py"""
+
+import collections
+import copy
+import os
+import os.path
+import re
+import sys
+
+from coverage import env
+from coverage.backward import configparser, iitems, string_class
+from coverage.misc import contract, CoverageException, isolate_module
+from coverage.misc import substitute_variables
+
+from coverage.tomlconfig import TomlConfigParser, TomlDecodeError
+
+os = isolate_module(os)
+
+
+class HandyConfigParser(configparser.RawConfigParser):
+    """Our specialization of ConfigParser."""
+
+    def __init__(self, our_file):
+        """Create the HandyConfigParser.
+
+        `our_file` is True if this config file is specifically for coverage,
+        False if we are examining another config file (tox.ini, setup.cfg)
+        for possible settings.
+        """
+
+        configparser.RawConfigParser.__init__(self)
+        self.section_prefixes = ["coverage:"]
+        if our_file:
+            self.section_prefixes.append("")
+
+    def read(self, filenames, encoding=None):
+        """Read a file name as UTF-8 configuration data."""
+        kwargs = {}
+        if env.PYVERSION >= (3, 2):
+            kwargs['encoding'] = encoding or "utf-8"
+        return configparser.RawConfigParser.read(self, filenames, **kwargs)
+
+    def has_option(self, section, option):
+        for section_prefix in self.section_prefixes:
+            real_section = section_prefix + section
+            has = configparser.RawConfigParser.has_option(self, real_section, option)
+            if has:
+                return has
+        return False
+
+    def has_section(self, section):
+        for section_prefix in self.section_prefixes:
+            real_section = section_prefix + section
+            has = configparser.RawConfigParser.has_section(self, real_section)
+            if has:
+                return real_section
+        return False
+
+    def options(self, section):
+        for section_prefix in self.section_prefixes:
+            real_section = section_prefix + section
+            if configparser.RawConfigParser.has_section(self, real_section):
+                return configparser.RawConfigParser.options(self, real_section)
+        raise configparser.NoSectionError(section)
+
+    def get_section(self, section):
+        """Get the contents of a section, as a dictionary."""
+        d = {}
+        for opt in self.options(section):
+            d[opt] = self.get(section, opt)
+        return d
+
+    def get(self, section, option, *args, **kwargs):
+        """Get a value, replacing environment variables also.
+
+        The arguments are the same as `RawConfigParser.get`, but in the found
+        value, ``$WORD`` or ``${WORD}`` are replaced by the value of the
+        environment variable ``WORD``.
+
+        Returns the finished value.
+
+        """
+        for section_prefix in self.section_prefixes:
+            real_section = section_prefix + section
+            if configparser.RawConfigParser.has_option(self, real_section, option):
+                break
+        else:
+            raise configparser.NoOptionError(option, section)
+
+        v = configparser.RawConfigParser.get(self, real_section, option, *args, **kwargs)
+        v = substitute_variables(v, os.environ)
+        return v
+
+    def getlist(self, section, option):
+        """Read a list of strings.
+
+        The value of `section` and `option` is treated as a comma- and newline-
+        separated list of strings.  Each value is stripped of whitespace.
+
+        Returns the list of strings.
+
+        """
+        value_list = self.get(section, option)
+        values = []
+        for value_line in value_list.split('\n'):
+            for value in value_line.split(','):
+                value = value.strip()
+                if value:
+                    values.append(value)
+        return values
+
+    def getregexlist(self, section, option):
+        """Read a list of full-line regexes.
+
+        The value of `section` and `option` is treated as a newline-separated
+        list of regexes.  Each value is stripped of whitespace.
+
+        Returns the list of strings.
+
+        """
+        line_list = self.get(section, option)
+        value_list = []
+        for value in line_list.splitlines():
+            value = value.strip()
+            try:
+                re.compile(value)
+            except re.error as e:
+                raise CoverageException(
+                    "Invalid [%s].%s value %r: %s" % (section, option, value, e)
+                )
+            if value:
+                value_list.append(value)
+        return value_list
+
+
+# The default line exclusion regexes.
+DEFAULT_EXCLUDE = [
+    r'#\s*(pragma|PRAGMA)[:\s]?\s*(no|NO)\s*(cover|COVER)',
+]
+
+# The default partial branch regexes, to be modified by the user.
+DEFAULT_PARTIAL = [
+    r'#\s*(pragma|PRAGMA)[:\s]?\s*(no|NO)\s*(branch|BRANCH)',
+]
+
+# The default partial branch regexes, based on Python semantics.
+# These are any Python branching constructs that can't actually execute all
+# their branches.
+DEFAULT_PARTIAL_ALWAYS = [
+    'while (True|1|False|0):',
+    'if (True|1|False|0):',
+]
+
+
+class CoverageConfig(object):
+    """Coverage.py configuration.
+
+    The attributes of this class are the various settings that control the
+    operation of coverage.py.
+
+    """
+    # pylint: disable=too-many-instance-attributes
+
+    def __init__(self):
+        """Initialize the configuration attributes to their defaults."""
+        # Metadata about the config.
+        # We tried to read these config files.
+        self.attempted_config_files = []
+        # We did read these config files, but maybe didn't find any content for us.
+        self.config_files_read = []
+        # The file that gave us our configuration.
+        self.config_file = None
+        self._config_contents = None
+
+        # Defaults for [run] and [report]
+        self._include = None
+        self._omit = None
+
+        # Defaults for [run]
+        self.branch = False
+        self.command_line = None
+        self.concurrency = None
+        self.context = None
+        self.cover_pylib = False
+        self.data_file = ".coverage"
+        self.debug = []
+        self.disable_warnings = []
+        self.dynamic_context = None
+        self.note = None
+        self.parallel = False
+        self.plugins = []
+        self.relative_files = False
+        self.run_include = None
+        self.run_omit = None
+        self.source = None
+        self.source_pkgs = []
+        self.timid = False
+        self._crash = None
+
+        # Defaults for [report]
+        self.exclude_list = DEFAULT_EXCLUDE[:]
+        self.fail_under = 0.0
+        self.ignore_errors = False
+        self.report_include = None
+        self.report_omit = None
+        self.partial_always_list = DEFAULT_PARTIAL_ALWAYS[:]
+        self.partial_list = DEFAULT_PARTIAL[:]
+        self.precision = 0
+        self.report_contexts = None
+        self.show_missing = False
+        self.skip_covered = False
+        self.skip_empty = False
+        self.sort = None
+
+        # Defaults for [html]
+        self.extra_css = None
+        self.html_dir = "htmlcov"
+        self.html_skip_covered = None
+        self.html_skip_empty = None
+        self.html_title = "Coverage report"
+        self.show_contexts = False
+
+        # Defaults for [xml]
+        self.xml_output = "coverage.xml"
+        self.xml_package_depth = 99
+
+        # Defaults for [json]
+        self.json_output = "coverage.json"
+        self.json_pretty_print = False
+        self.json_show_contexts = False
+
+        # Defaults for [paths]
+        self.paths = collections.OrderedDict()
+
+        # Options for plugins
+        self.plugin_options = {}
+        self.suppress_plugin_errors = True
+
+    MUST_BE_LIST = [
+        "debug", "concurrency", "plugins",
+        "report_omit", "report_include",
+        "run_omit", "run_include",
+    ]
+
+    def from_args(self, **kwargs):
+        """Read config values from `kwargs`."""
+        for k, v in iitems(kwargs):
+            if v is not None:
+                if k in self.MUST_BE_LIST and isinstance(v, string_class):
+                    v = [v]
+                setattr(self, k, v)
+
+    def from_resource(self, resource_name):
+        assert getattr(sys, 'is_standalone_binary', False), 'You have used method by mistake in script, not binary'
+        cp, self._config_contents = _load_config_from_resource(resource_name)
+        return self._parse_config(cp, resource_name, True)
+
+    @contract(filename=str)
+    def from_file(self, filename, our_file):
+        """Read configuration from a .rc file.
+
+        `filename` is a file name to read.
+
+        `our_file` is True if this config file is specifically for coverage,
+        False if we are examining another config file (tox.ini, setup.cfg)
+        for possible settings.
+
+        Returns True or False, whether the file could be read, and it had some
+        coverage.py settings in it.
+
+        """
+        _, ext = os.path.splitext(filename)
+        if ext == '.toml':
+            cp = TomlConfigParser(our_file)
+        else:
+            cp = HandyConfigParser(our_file)
+
+        self.attempted_config_files.append(filename)
+
+        try:
+            files_read = cp.read(filename)
+        except (configparser.Error, TomlDecodeError) as err:
+            raise CoverageException("Couldn't read config file %s: %s" % (filename, err))
+        if not files_read:
+            return False
+
+        self.config_files_read.extend(map(os.path.abspath, files_read))
+
+        return self._parse_config(cp, filename, our_file)
+
+    def _parse_config(self, cp, filename, our_file):
+        any_set = False
+        try:
+            for option_spec in self.CONFIG_FILE_OPTIONS:
+                was_set = self._set_attr_from_config_option(cp, *option_spec)
+                if was_set:
+                    any_set = True
+        except ValueError as err:
+            raise CoverageException("Couldn't read config file %s: %s" % (filename, err))
+
+        # Check that there are no unrecognized options.
+        all_options = collections.defaultdict(set)
+        for option_spec in self.CONFIG_FILE_OPTIONS:
+            section, option = option_spec[1].split(":")
+            all_options[section].add(option)
+
+        for section, options in iitems(all_options):
+            real_section = cp.has_section(section)
+            if real_section:
+                for unknown in set(cp.options(section)) - options:
+                    raise CoverageException(
+                        "Unrecognized option '[%s] %s=' in config file %s" % (
+                            real_section, unknown, filename
+                        )
+                    )
+
+        # [paths] is special
+        if cp.has_section('paths'):
+            for option in cp.options('paths'):
+                self.paths[option] = cp.getlist('paths', option)
+                any_set = True
+
+        # plugins can have options
+        for plugin in self.plugins:
+            if cp.has_section(plugin):
+                self.plugin_options[plugin] = cp.get_section(plugin)
+                any_set = True
+
+        # Was this file used as a config file? If it's specifically our file,
+        # then it was used.  If we're piggybacking on someone else's file,
+        # then it was only used if we found some settings in it.
+        if our_file:
+            used = True
+        else:
+            used = any_set
+
+        if used:
+            self.config_file = os.path.abspath(filename)
+            if not getattr(sys, 'is_standalone_binary', False):
+                with open(filename, "rb") as f:
+                    self._config_contents = f.read()
+
+        return used
+
+    def copy(self):
+        """Return a copy of the configuration."""
+        return copy.deepcopy(self)
+
+    CONFIG_FILE_OPTIONS = [
+        # These are *args for _set_attr_from_config_option:
+        #   (attr, where, type_="")
+        #
+        #   attr is the attribute to set on the CoverageConfig object.
+        #   where is the section:name to read from the configuration file.
+        #   type_ is the optional type to apply, by using .getTYPE to read the
+        #       configuration value from the file.
+
+        # [run]
+        ('branch', 'run:branch', 'boolean'),
+        ('command_line', 'run:command_line'),
+        ('concurrency', 'run:concurrency', 'list'),
+        ('context', 'run:context'),
+        ('cover_pylib', 'run:cover_pylib', 'boolean'),
+        ('data_file', 'run:data_file'),
+        ('debug', 'run:debug', 'list'),
+        ('disable_warnings', 'run:disable_warnings', 'list'),
+        ('dynamic_context', 'run:dynamic_context'),
+        ('note', 'run:note'),
+        ('parallel', 'run:parallel', 'boolean'),
+        ('plugins', 'run:plugins', 'list'),
+        ('relative_files', 'run:relative_files', 'boolean'),
+        ('run_include', 'run:include', 'list'),
+        ('run_omit', 'run:omit', 'list'),
+        ('source', 'run:source', 'list'),
+        ('source_pkgs', 'run:source_pkgs', 'list'),
+        ('timid', 'run:timid', 'boolean'),
+        ('_crash', 'run:_crash'),
+        ('suppress_plugin_errors', 'run:suppress_plugin_errors', 'boolean'),
+
+        # [report]
+        ('exclude_list', 'report:exclude_lines', 'regexlist'),
+        ('fail_under', 'report:fail_under', 'float'),
+        ('ignore_errors', 'report:ignore_errors', 'boolean'),
+        ('partial_always_list', 'report:partial_branches_always', 'regexlist'),
+        ('partial_list', 'report:partial_branches', 'regexlist'),
+        ('precision', 'report:precision', 'int'),
+        ('report_contexts', 'report:contexts', 'list'),
+        ('report_include', 'report:include', 'list'),
+        ('report_omit', 'report:omit', 'list'),
+        ('show_missing', 'report:show_missing', 'boolean'),
+        ('skip_covered', 'report:skip_covered', 'boolean'),
+        ('skip_empty', 'report:skip_empty', 'boolean'),
+        ('sort', 'report:sort'),
+
+        # [html]
+        ('extra_css', 'html:extra_css'),
+        ('html_dir', 'html:directory'),
+        ('html_skip_covered', 'html:skip_covered', 'boolean'),
+        ('html_skip_empty', 'html:skip_empty', 'boolean'),
+        ('html_title', 'html:title'),
+        ('show_contexts', 'html:show_contexts', 'boolean'),
+
+        # [xml]
+        ('xml_output', 'xml:output'),
+        ('xml_package_depth', 'xml:package_depth', 'int'),
+
+        # [json]
+        ('json_output', 'json:output'),
+        ('json_pretty_print', 'json:pretty_print', 'boolean'),
+        ('json_show_contexts', 'json:show_contexts', 'boolean'),
+    ]
+
+    def _set_attr_from_config_option(self, cp, attr, where, type_=''):
+        """Set an attribute on self if it exists in the ConfigParser.
+
+        Returns True if the attribute was set.
+
+        """
+        section, option = where.split(":")
+        if cp.has_option(section, option):
+            method = getattr(cp, 'get' + type_)
+            setattr(self, attr, method(section, option))
+            return True
+        return False
+
+    def get_plugin_options(self, plugin):
+        """Get a dictionary of options for the plugin named `plugin`."""
+        return self.plugin_options.get(plugin, {})
+
+    def set_option(self, option_name, value):
+        """Set an option in the configuration.
+
+        `option_name` is a colon-separated string indicating the section and
+        option name.  For example, the ``branch`` option in the ``[run]``
+        section of the config file would be indicated with `"run:branch"`.
+
+        `value` is the new value for the option.
+
+        """
+        # Special-cased options.
+        if option_name == "paths":
+            self.paths = value
+            return
+
+        # Check all the hard-coded options.
+        for option_spec in self.CONFIG_FILE_OPTIONS:
+            attr, where = option_spec[:2]
+            if where == option_name:
+                setattr(self, attr, value)
+                return
+
+        # See if it's a plugin option.
+        plugin_name, _, key = option_name.partition(":")
+        if key and plugin_name in self.plugins:
+            self.plugin_options.setdefault(plugin_name, {})[key] = value
+            return
+
+        # If we get here, we didn't find the option.
+        raise CoverageException("No such option: %r" % option_name)
+
+    def get_option(self, option_name):
+        """Get an option from the configuration.
+
+        `option_name` is a colon-separated string indicating the section and
+        option name.  For example, the ``branch`` option in the ``[run]``
+        section of the config file would be indicated with `"run:branch"`.
+
+        Returns the value of the option.
+
+        """
+        # Special-cased options.
+        if option_name == "paths":
+            return self.paths
+
+        # Check all the hard-coded options.
+        for option_spec in self.CONFIG_FILE_OPTIONS:
+            attr, where = option_spec[:2]
+            if where == option_name:
+                return getattr(self, attr)
+
+        # See if it's a plugin option.
+        plugin_name, _, key = option_name.partition(":")
+        if key and plugin_name in self.plugins:
+            return self.plugin_options.get(plugin_name, {}).get(key)
+
+        # If we get here, we didn't find the option.
+        raise CoverageException("No such option: %r" % option_name)
+
+    def post_process_file(self, path):
+        """Make final adjustments to a file path to make it usable."""
+        return os.path.expanduser(path)
+
+    def post_process(self):
+        """Make final adjustments to settings to make them usable."""
+        self.data_file = self.post_process_file(self.data_file)
+        self.html_dir = self.post_process_file(self.html_dir)
+        self.xml_output = self.post_process_file(self.xml_output)
+        self.paths = collections.OrderedDict(
+            (k, [self.post_process_file(f) for f in v])
+            for k, v in self.paths.items()
+        )
+
+
+def config_files_to_try(config_file):
+    """What config files should we try to read?
+
+    Returns a list of tuples:
+        (filename, is_our_file, was_file_specified)
+    """
+
+    # Some API users were specifying ".coveragerc" to mean the same as
+    # True, so make it so.
+    if config_file == ".coveragerc":
+        config_file = True
+    specified_file = (config_file is not True)
+    if not specified_file:
+        # No file was specified. Check COVERAGE_RCFILE.
+        config_file = os.environ.get('COVERAGE_RCFILE')
+        if config_file:
+            specified_file = True
+    if not specified_file:
+        # Still no file specified. Default to .coveragerc
+        config_file = ".coveragerc"
+    files_to_try = [
+        (config_file, True, specified_file),
+        ("setup.cfg", False, False),
+        ("tox.ini", False, False),
+        ("pyproject.toml", False, False),
+    ]
+    return files_to_try
+
+
+def read_coverage_config(config_file, **kwargs):
+    """Read the coverage.py configuration.
+
+    Arguments:
+        config_file: a boolean or string, see the `Coverage` class for the
+            tricky details.
+        all others: keyword arguments from the `Coverage` class, used for
+            setting values in the configuration.
+
+    Returns:
+        config:
+            config is a CoverageConfig object read from the appropriate
+            configuration file.
+
+    """
+    # Build the configuration from a number of sources:
+    # 1) defaults:
+    config = CoverageConfig()
+
+    # 1.1 built-in config
+    if getattr(sys, 'is_standalone_binary', False):
+        config.from_resource("/coverage_plugins/coveragerc.txt")
+
+    # 2) from a file:
+    if config_file:
+        files_to_try = config_files_to_try(config_file)
+
+        for fname, our_file, specified_file in files_to_try:
+            if getattr(sys, 'is_standalone_binary', False) and fname == "/coverage_plugins/coveragerc.txt":
+                continue
+            config_read = config.from_file(fname, our_file=our_file)
+            if config_read:
+                break
+            if specified_file:
+                raise CoverageException("Couldn't read '%s' as a config file" % fname)
+
+    # $set_env.py: COVERAGE_DEBUG - Options for --debug.
+    # 3) from environment variables:
+    env_data_file = os.environ.get('COVERAGE_FILE')
+    if env_data_file:
+        config.data_file = env_data_file
+    debugs = os.environ.get('COVERAGE_DEBUG')
+    if debugs:
+        config.debug.extend(d.strip() for d in debugs.split(","))
+
+    # 4) from constructor arguments:
+    config.from_args(**kwargs)
+
+    # Once all the config has been collected, there's a little post-processing
+    # to do.
+    config.post_process()
+
+    return config
+
+
+def _load_config_from_resource(resource_name):
+    from io import StringIO
+    from library.python import resource
+
+    config_data = resource.find(resource_name)
+    if config_data is None:
+        raise IOError("No such resource: " + resource_name)
+
+    config_data = config_data.decode('utf-8')
+    cp = HandyConfigParser(True)
+    try:
+        cp.readfp(StringIO(config_data))
+    except configparser.Error as err:
+        raise CoverageException("Couldn't read config %s: %s" % (resource_name, err))
+    return cp, config_data
diff --git a/contrib/python/coverage/py3/coverage/context.py b/contrib/python/coverage/py3/coverage/context.py
new file mode 100644
index 0000000000..ea13da21ed
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/context.py
@@ -0,0 +1,91 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Determine contexts for coverage.py"""
+
+
+def combine_context_switchers(context_switchers):
+    """Create a single context switcher from multiple switchers.
+
+    `context_switchers` is a list of functions that take a frame as an
+    argument and return a string to use as the new context label.
+
+    Returns a function that composites `context_switchers` functions, or None
+    if `context_switchers` is an empty list.
+
+    When invoked, the combined switcher calls `context_switchers` one-by-one
+    until a string is returned.  The combined switcher returns None if all
+    `context_switchers` return None.
+    """
+    if not context_switchers:
+        return None
+
+    if len(context_switchers) == 1:
+        return context_switchers[0]
+
+    def should_start_context(frame):
+        """The combiner for multiple context switchers."""
+        for switcher in context_switchers:
+            new_context = switcher(frame)
+            if new_context is not None:
+                return new_context
+        return None
+
+    return should_start_context
+
+
+def should_start_context_test_function(frame):
+    """Is this frame calling a test_* function?"""
+    co_name = frame.f_code.co_name
+    if co_name.startswith("test") or co_name == "runTest":
+        return qualname_from_frame(frame)
+    return None
+
+
+def qualname_from_frame(frame):
+    """Get a qualified name for the code running in `frame`."""
+    co = frame.f_code
+    fname = co.co_name
+    method = None
+    if co.co_argcount and co.co_varnames[0] == "self":
+        self = frame.f_locals["self"]
+        method = getattr(self, fname, None)
+
+    if method is None:
+        func = frame.f_globals.get(fname)
+        if func is None:
+            return None
+        return func.__module__ + '.' + fname
+
+    func = getattr(method, '__func__', None)
+    if func is None:
+        cls = self.__class__
+        return cls.__module__ + '.' + cls.__name__ + "." + fname
+
+    if hasattr(func, '__qualname__'):
+        qname = func.__module__ + '.' + func.__qualname__
+    else:
+        for cls in getattr(self.__class__, '__mro__', ()):
+            f = cls.__dict__.get(fname, None)
+            if f is None:
+                continue
+            if f is func:
+                qname = cls.__module__ + '.' + cls.__name__ + "." + fname
+                break
+        else:
+            # Support for old-style classes.
+            def mro(bases):
+                for base in bases:
+                    f = base.__dict__.get(fname, None)
+                    if f is func:
+                        return base.__module__ + '.' + base.__name__ + "." + fname
+                for base in bases:
+                    qname = mro(base.__bases__)
+                    if qname is not None:
+                        return qname
+                return None
+            qname = mro([self.__class__])
+            if qname is None:
+                qname = func.__module__ + '.' + fname
+
+    return qname
diff --git a/contrib/python/coverage/py3/coverage/control.py b/contrib/python/coverage/py3/coverage/control.py
new file mode 100644
index 0000000000..605b50c26b
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/control.py
@@ -0,0 +1,1162 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Core control stuff for coverage.py."""
+
+import atexit
+import collections
+import contextlib
+import os
+import os.path
+import platform
+import sys
+import time
+import json
+
+from coverage import env
+from coverage.annotate import AnnotateReporter
+from coverage.backward import string_class, iitems
+from coverage.collector import Collector, CTracer
+from coverage.config import read_coverage_config
+from coverage.context import should_start_context_test_function, combine_context_switchers
+from coverage.data import CoverageData, combine_parallel_data
+from coverage.debug import DebugControl, short_stack, write_formatted_info
+from coverage.disposition import disposition_debug_msg
+from coverage.files import PathAliases, abs_file, canonical_filename, relative_filename, set_relative_directory
+from coverage.html import HtmlReporter
+from coverage.inorout import InOrOut
+from coverage.jsonreport import JsonReporter
+from coverage.misc import CoverageException, bool_or_none, join_regex
+from coverage.misc import DefaultValue, ensure_dir_for_file, isolate_module
+from coverage.plugin import FileReporter
+from coverage.plugin_support import Plugins
+from coverage.python import PythonFileReporter
+from coverage.report import render_report
+from coverage.results import Analysis, Numbers
+from coverage.summary import SummaryReporter
+from coverage.xmlreport import XmlReporter
+
+try:
+    from coverage.multiproc import patch_multiprocessing
+except ImportError:                                         # pragma: only jython
+    # Jython has no multiprocessing module.
+    patch_multiprocessing = None
+
+os = isolate_module(os)
+
+@contextlib.contextmanager
+def override_config(cov, **kwargs):
+    """Temporarily tweak the configuration of `cov`.
+
+    The arguments are applied to `cov.config` with the `from_args` method.
+    At the end of the with-statement, the old configuration is restored.
+    """
+    original_config = cov.config
+    cov.config = cov.config.copy()
+    try:
+        cov.config.from_args(**kwargs)
+        yield
+    finally:
+        cov.config = original_config
+
+
+_DEFAULT_DATAFILE = DefaultValue("MISSING")
+
+class Coverage(object):
+    """Programmatic access to coverage.py.
+
+    To use::
+
+        from coverage import Coverage
+
+        cov = Coverage()
+        cov.start()
+        #.. call your code ..
+        cov.stop()
+        cov.html_report(directory='covhtml')
+
+    Note: in keeping with Python custom, names starting with underscore are
+    not part of the public API. They might stop working at any point.  Please
+    limit yourself to documented methods to avoid problems.
+
+    """
+
+    # The stack of started Coverage instances.
+    _instances = []
+
+    @classmethod
+    def current(cls):
+        """Get the latest started `Coverage` instance, if any.
+
+        Returns: a `Coverage` instance, or None.
+
+        .. versionadded:: 5.0
+
+        """
+        if cls._instances:
+            return cls._instances[-1]
+        else:
+            return None
+
+    def __init__(
+        self, data_file=_DEFAULT_DATAFILE, data_suffix=None, cover_pylib=None,
+        auto_data=False, timid=None, branch=None, config_file=True,
+        source=None, source_pkgs=None, omit=None, include=None, debug=None,
+        concurrency=None, check_preimported=False, context=None,
+    ):  # pylint: disable=too-many-arguments
+        """
+        Many of these arguments duplicate and override values that can be
+        provided in a configuration file.  Parameters that are missing here
+        will use values from the config file.
+
+        `data_file` is the base name of the data file to use. The config value
+        defaults to ".coverage".  None can be provided to prevent writing a data
+        file.  `data_suffix` is appended (with a dot) to `data_file` to create
+        the final file name.  If `data_suffix` is simply True, then a suffix is
+        created with the machine and process identity included.
+
+        `cover_pylib` is a boolean determining whether Python code installed
+        with the Python interpreter is measured.  This includes the Python
+        standard library and any packages installed with the interpreter.
+
+        If `auto_data` is true, then any existing data file will be read when
+        coverage measurement starts, and data will be saved automatically when
+        measurement stops.
+
+        If `timid` is true, then a slower and simpler trace function will be
+        used.  This is important for some environments where manipulation of
+        tracing functions breaks the faster trace function.
+
+        If `branch` is true, then branch coverage will be measured in addition
+        to the usual statement coverage.
+
+        `config_file` determines what configuration file to read:
+
+            * If it is ".coveragerc", it is interpreted as if it were True,
+              for backward compatibility.
+
+            * If it is a string, it is the name of the file to read.  If the
+              file can't be read, it is an error.
+
+            * If it is True, then a few standard files names are tried
+              (".coveragerc", "setup.cfg", "tox.ini").  It is not an error for
+              these files to not be found.
+
+            * If it is False, then no configuration file is read.
+
+        `source` is a list of file paths or package names.  Only code located
+        in the trees indicated by the file paths or package names will be
+        measured.
+
+        `source_pkgs` is a list of package names. It works the same as
+        `source`, but can be used to name packages where the name can also be
+        interpreted as a file path.
+
+        `include` and `omit` are lists of file name patterns. Files that match
+        `include` will be measured, files that match `omit` will not.  Each
+        will also accept a single string argument.
+
+        `debug` is a list of strings indicating what debugging information is
+        desired.
+
+        `concurrency` is a string indicating the concurrency library being used
+        in the measured code.  Without this, coverage.py will get incorrect
+        results if these libraries are in use.  Valid strings are "greenlet",
+        "eventlet", "gevent", "multiprocessing", or "thread" (the default).
+        This can also be a list of these strings.
+
+        If `check_preimported` is true, then when coverage is started, the
+        already-imported files will be checked to see if they should be
+        measured by coverage.  Importing measured files before coverage is
+        started can mean that code is missed.
+
+        `context` is a string to use as the :ref:`static context
+        <static_contexts>` label for collected data.
+
+        .. versionadded:: 4.0
+            The `concurrency` parameter.
+
+        .. versionadded:: 4.2
+            The `concurrency` parameter can now be a list of strings.
+
+        .. versionadded:: 5.0
+            The `check_preimported` and `context` parameters.
+
+        .. versionadded:: 5.3
+            The `source_pkgs` parameter.
+
+        """
+        # data_file=None means no disk file at all. data_file missing means
+        # use the value from the config file.
+        self._no_disk = data_file is None
+        if data_file is _DEFAULT_DATAFILE:
+            data_file = None
+
+        # Build our configuration from a number of sources.
+        self.config = read_coverage_config(
+            config_file=config_file,
+            data_file=data_file, cover_pylib=cover_pylib, timid=timid,
+            branch=branch, parallel=bool_or_none(data_suffix),
+            source=source, source_pkgs=source_pkgs, run_omit=omit, run_include=include, debug=debug,
+            report_omit=omit, report_include=include,
+            concurrency=concurrency, context=context,
+            )
+
+        # This is injectable by tests.
+        self._debug_file = None
+
+        self._auto_load = self._auto_save = auto_data
+        self._data_suffix_specified = data_suffix
+
+        # Is it ok for no data to be collected?
+        self._warn_no_data = True
+        self._warn_unimported_source = True
+        self._warn_preimported_source = check_preimported
+        self._no_warn_slugs = None
+
+        # A record of all the warnings that have been issued.
+        self._warnings = []
+
+        # Other instance attributes, set later.
+        self._data = self._collector = None
+        self._plugins = None
+        self._inorout = None
+        self._data_suffix = self._run_suffix = None
+        self._exclude_re = None
+        self._debug = None
+        self._file_mapper = None
+
+        # State machine variables:
+        # Have we initialized everything?
+        self._inited = False
+        self._inited_for_start = False
+        # Have we started collecting and not stopped it?
+        self._started = False
+        # Should we write the debug output?
+        self._should_write_debug = True
+
+        # If we have sub-process measurement happening automatically, then we
+        # want any explicit creation of a Coverage object to mean, this process
+        # is already coverage-aware, so don't auto-measure it.  By now, the
+        # auto-creation of a Coverage object has already happened.  But we can
+        # find it and tell it not to save its data.
+        if not env.METACOV:
+            _prevent_sub_process_measurement()
+
+        # Store constructor args to reproduce Coverage object in a subprocess created via multiprocessing.Process
+        self._dumped_args = json.dumps(dict(
+            data_file=data_file, data_suffix=data_suffix, cover_pylib=cover_pylib,
+            auto_data=auto_data, timid=timid, branch=branch, config_file=config_file,
+            source=source, omit=omit, include=include, debug=debug,
+            concurrency=concurrency
+        ))
+
+    def _init(self):
+        """Set all the initial state.
+
+        This is called by the public methods to initialize state. This lets us
+        construct a :class:`Coverage` object, then tweak its state before this
+        function is called.
+
+        """
+        if self._inited:
+            return
+
+        self._inited = True
+
+        # Create and configure the debugging controller. COVERAGE_DEBUG_FILE
+        # is an environment variable, the name of a file to append debug logs
+        # to.
+        self._debug = DebugControl(self.config.debug, self._debug_file)
+
+        if "multiprocessing" in (self.config.concurrency or ()):
+            # Multi-processing uses parallel for the subprocesses, so also use
+            # it for the main process.
+            self.config.parallel = True
+
+        # _exclude_re is a dict that maps exclusion list names to compiled regexes.
+        self._exclude_re = {}
+
+        set_relative_directory()
+
+        if getattr(sys, 'is_standalone_binary', False):
+            self._file_mapper = canonical_filename
+        else:
+            self._file_mapper = relative_filename if self.config.relative_files else abs_file
+
+        # Load plugins
+        self._plugins = Plugins.load_plugins(self.config.plugins, self.config, self._debug)
+
+        # Run configuring plugins.
+        for plugin in self._plugins.configurers:
+            # We need an object with set_option and get_option. Either self or
+            # self.config will do. Choosing randomly stops people from doing
+            # other things with those objects, against the public API.  Yes,
+            # this is a bit childish. :)
+            plugin.configure([self, self.config][int(time.time()) % 2])
+
+    def _post_init(self):
+        """Stuff to do after everything is initialized."""
+        if self._should_write_debug:
+            self._should_write_debug = False
+            self._write_startup_debug()
+
+        # '[run] _crash' will raise an exception if the value is close by in
+        # the call stack, for testing error handling.
+        if self.config._crash and self.config._crash in short_stack(limit=4):
+            raise Exception("Crashing because called by {}".format(self.config._crash))
+
+    def _write_startup_debug(self):
+        """Write out debug info at startup if needed."""
+        wrote_any = False
+        with self._debug.without_callers():
+            if self._debug.should('config'):
+                config_info = sorted(self.config.__dict__.items())
+                config_info = [(k, v) for k, v in config_info if not k.startswith('_')]
+                write_formatted_info(self._debug, "config", config_info)
+                wrote_any = True
+
+            if self._debug.should('sys'):
+                write_formatted_info(self._debug, "sys", self.sys_info())
+                for plugin in self._plugins:
+                    header = "sys: " + plugin._coverage_plugin_name
+                    info = plugin.sys_info()
+                    write_formatted_info(self._debug, header, info)
+                wrote_any = True
+
+        if wrote_any:
+            write_formatted_info(self._debug, "end", ())
+
+    def _should_trace(self, filename, frame):
+        """Decide whether to trace execution in `filename`.
+
+        Calls `_should_trace_internal`, and returns the FileDisposition.
+
+        """
+        disp = self._inorout.should_trace(filename, frame)
+        if self._debug.should('trace'):
+            self._debug.write(disposition_debug_msg(disp))
+        return disp
+
+    def _check_include_omit_etc(self, filename, frame):
+        """Check a file name against the include/omit/etc, rules, verbosely.
+
+        Returns a boolean: True if the file should be traced, False if not.
+
+        """
+        reason = self._inorout.check_include_omit_etc(filename, frame)
+        if self._debug.should('trace'):
+            if not reason:
+                msg = "Including %r" % (filename,)
+            else:
+                msg = "Not including %r: %s" % (filename, reason)
+            self._debug.write(msg)
+
+        return not reason
+
+    def _warn(self, msg, slug=None, once=False):
+        """Use `msg` as a warning.
+
+        For warning suppression, use `slug` as the shorthand.
+
+        If `once` is true, only show this warning once (determined by the
+        slug.)
+
+        """
+        if self._no_warn_slugs is None:
+            self._no_warn_slugs = list(self.config.disable_warnings)
+
+        if slug in self._no_warn_slugs:
+            # Don't issue the warning
+            return
+
+        self._warnings.append(msg)
+        if slug:
+            msg = "%s (%s)" % (msg, slug)
+        if self._debug.should('pid'):
+            msg = "[%d] %s" % (os.getpid(), msg)
+        sys.stderr.write("Coverage.py warning: %s\n" % msg)
+
+        if once:
+            self._no_warn_slugs.append(slug)
+
+    def get_option(self, option_name):
+        """Get an option from the configuration.
+
+        `option_name` is a colon-separated string indicating the section and
+        option name.  For example, the ``branch`` option in the ``[run]``
+        section of the config file would be indicated with `"run:branch"`.
+
+        Returns the value of the option.  The type depends on the option
+        selected.
+
+        As a special case, an `option_name` of ``"paths"`` will return an
+        OrderedDict with the entire ``[paths]`` section value.
+
+        .. versionadded:: 4.0
+
+        """
+        return self.config.get_option(option_name)
+
+    def set_option(self, option_name, value):
+        """Set an option in the configuration.
+
+        `option_name` is a colon-separated string indicating the section and
+        option name.  For example, the ``branch`` option in the ``[run]``
+        section of the config file would be indicated with ``"run:branch"``.
+
+        `value` is the new value for the option.  This should be an
+        appropriate Python value.  For example, use True for booleans, not the
+        string ``"True"``.
+
+        As an example, calling::
+
+            cov.set_option("run:branch", True)
+
+        has the same effect as this configuration file::
+
+            [run]
+            branch = True
+
+        As a special case, an `option_name` of ``"paths"`` will replace the
+        entire ``[paths]`` section.  The value should be an OrderedDict.
+
+        .. versionadded:: 4.0
+
+        """
+        self.config.set_option(option_name, value)
+
+    def load(self):
+        """Load previously-collected coverage data from the data file."""
+        self._init()
+        if self._collector:
+            self._collector.reset()
+        should_skip = self.config.parallel and not os.path.exists(self.config.data_file)
+        if not should_skip:
+            self._init_data(suffix=None)
+        self._post_init()
+        if not should_skip:
+            self._data.read()
+
+    def _init_for_start(self):
+        """Initialization for start()"""
+        # Construct the collector.
+        concurrency = self.config.concurrency or ()
+        if "multiprocessing" in concurrency:
+            if not patch_multiprocessing:
+                raise CoverageException(                    # pragma: only jython
+                    "multiprocessing is not supported on this Python"
+                )
+            patch_multiprocessing(rcfile=self.config.config_file, coverage_args=self._dumped_args)
+
+        dycon = self.config.dynamic_context
+        if not dycon or dycon == "none":
+            context_switchers = []
+        elif dycon == "test_function":
+            context_switchers = [should_start_context_test_function]
+        else:
+            raise CoverageException(
+                "Don't understand dynamic_context setting: {!r}".format(dycon)
+            )
+
+        context_switchers.extend(
+            plugin.dynamic_context for plugin in self._plugins.context_switchers
+        )
+
+        should_start_context = combine_context_switchers(context_switchers)
+
+        self._collector = Collector(
+            should_trace=self._should_trace,
+            check_include=self._check_include_omit_etc,
+            should_start_context=should_start_context,
+            file_mapper=self._file_mapper,
+            timid=self.config.timid,
+            branch=self.config.branch,
+            warn=self._warn,
+            concurrency=concurrency,
+            )
+
+        suffix = self._data_suffix_specified
+        if suffix or self.config.parallel:
+            if not isinstance(suffix, string_class):
+                # if data_suffix=True, use .machinename.pid.random
+                suffix = True
+        else:
+            suffix = None
+
+        self._init_data(suffix)
+
+        self._collector.use_data(self._data, self.config.context)
+
+        # Early warning if we aren't going to be able to support plugins.
+        if self._plugins.file_tracers and not self._collector.supports_plugins:
+            self._warn(
+                "Plugin file tracers (%s) aren't supported with %s" % (
+                    ", ".join(
+                        plugin._coverage_plugin_name
+                            for plugin in self._plugins.file_tracers
+                        ),
+                    self._collector.tracer_name(),
+                    )
+                )
+            for plugin in self._plugins.file_tracers:
+                plugin._coverage_enabled = False
+
+        # Create the file classifying substructure.
+        self._inorout = InOrOut(
+            warn=self._warn,
+            debug=(self._debug if self._debug.should('trace') else None),
+        )
+        self._inorout.configure(self.config)
+        self._inorout.plugins = self._plugins
+        self._inorout.disp_class = self._collector.file_disposition_class
+
+        # It's useful to write debug info after initing for start.
+        self._should_write_debug = True
+
+        atexit.register(self._atexit)
+
+    def _init_data(self, suffix):
+        """Create a data file if we don't have one yet."""
+        if self._data is None:
+            # Create the data file.  We do this at construction time so that the
+            # data file will be written into the directory where the process
+            # started rather than wherever the process eventually chdir'd to.
+            ensure_dir_for_file(self.config.data_file)
+            self._data = CoverageData(
+                basename=self.config.data_file,
+                suffix=suffix,
+                warn=self._warn,
+                debug=self._debug,
+                no_disk=self._no_disk,
+            )
+
+    def start(self):
+        """Start measuring code coverage.
+
+        Coverage measurement only occurs in functions called after
+        :meth:`start` is invoked.  Statements in the same scope as
+        :meth:`start` won't be measured.
+
+        Once you invoke :meth:`start`, you must also call :meth:`stop`
+        eventually, or your process might not shut down cleanly.
+
+        """
+        self._init()
+        if not self._inited_for_start:
+            self._inited_for_start = True
+            self._init_for_start()
+        self._post_init()
+
+        # Issue warnings for possible problems.
+        self._inorout.warn_conflicting_settings()
+
+        # See if we think some code that would eventually be measured has
+        # already been imported.
+        if self._warn_preimported_source:
+            self._inorout.warn_already_imported_files()
+
+        if self._auto_load:
+            self.load()
+
+        self._collector.start()
+        self._started = True
+        self._instances.append(self)
+
+    def stop(self):
+        """Stop measuring code coverage."""
+        if self._instances:
+            if self._instances[-1] is self:
+                self._instances.pop()
+        if self._started:
+            self._collector.stop()
+        self._started = False
+
+    def _atexit(self):
+        """Clean up on process shutdown."""
+        if self._debug.should("process"):
+            self._debug.write("atexit: pid: {}, instance: {!r}".format(os.getpid(), self))
+        if self._started:
+            self.stop()
+        if self._auto_save:
+            self.save()
+
+    def erase(self):
+        """Erase previously collected coverage data.
+
+        This removes the in-memory data collected in this session as well as
+        discarding the data file.
+
+        """
+        self._init()
+        self._post_init()
+        if self._collector:
+            self._collector.reset()
+        self._init_data(suffix=None)
+        self._data.erase(parallel=self.config.parallel)
+        self._data = None
+        self._inited_for_start = False
+
+    def switch_context(self, new_context):
+        """Switch to a new dynamic context.
+
+        `new_context` is a string to use as the :ref:`dynamic context
+        <dynamic_contexts>` label for collected data.  If a :ref:`static
+        context <static_contexts>` is in use, the static and dynamic context
+        labels will be joined together with a pipe character.
+
+        Coverage collection must be started already.
+
+        .. versionadded:: 5.0
+
+        """
+        if not self._started:                           # pragma: part started
+            raise CoverageException(
+                "Cannot switch context, coverage is not started"
+                )
+
+        if self._collector.should_start_context:
+            self._warn("Conflicting dynamic contexts", slug="dynamic-conflict", once=True)
+
+        self._collector.switch_context(new_context)
+
+    def clear_exclude(self, which='exclude'):
+        """Clear the exclude list."""
+        self._init()
+        setattr(self.config, which + "_list", [])
+        self._exclude_regex_stale()
+
+    def exclude(self, regex, which='exclude'):
+        """Exclude source lines from execution consideration.
+
+        A number of lists of regular expressions are maintained.  Each list
+        selects lines that are treated differently during reporting.
+
+        `which` determines which list is modified.  The "exclude" list selects
+        lines that are not considered executable at all.  The "partial" list
+        indicates lines with branches that are not taken.
+
+        `regex` is a regular expression.  The regex is added to the specified
+        list.  If any of the regexes in the list is found in a line, the line
+        is marked for special treatment during reporting.
+
+        """
+        self._init()
+        excl_list = getattr(self.config, which + "_list")
+        excl_list.append(regex)
+        self._exclude_regex_stale()
+
+    def _exclude_regex_stale(self):
+        """Drop all the compiled exclusion regexes, a list was modified."""
+        self._exclude_re.clear()
+
+    def _exclude_regex(self, which):
+        """Return a compiled regex for the given exclusion list."""
+        if which not in self._exclude_re:
+            excl_list = getattr(self.config, which + "_list")
+            self._exclude_re[which] = join_regex(excl_list)
+        return self._exclude_re[which]
+
+    def get_exclude_list(self, which='exclude'):
+        """Return a list of excluded regex patterns.
+
+        `which` indicates which list is desired.  See :meth:`exclude` for the
+        lists that are available, and their meaning.
+
+        """
+        self._init()
+        return getattr(self.config, which + "_list")
+
+    def save(self):
+        """Save the collected coverage data to the data file."""
+        data = self.get_data()
+        data.write()
+
+    def combine(self, data_paths=None, strict=False, keep=False):
+        """Combine together a number of similarly-named coverage data files.
+
+        All coverage data files whose name starts with `data_file` (from the
+        coverage() constructor) will be read, and combined together into the
+        current measurements.
+
+        `data_paths` is a list of files or directories from which data should
+        be combined. If no list is passed, then the data files from the
+        directory indicated by the current data file (probably the current
+        directory) will be combined.
+
+        If `strict` is true, then it is an error to attempt to combine when
+        there are no data files to combine.
+
+        If `keep` is true, then original input data files won't be deleted.
+
+        .. versionadded:: 4.0
+            The `data_paths` parameter.
+
+        .. versionadded:: 4.3
+            The `strict` parameter.
+
+        .. versionadded: 5.5
+            The `keep` parameter.
+        """
+        self._init()
+        self._init_data(suffix=None)
+        self._post_init()
+        self.get_data()
+
+        aliases = None
+        if self.config.paths:
+            aliases = PathAliases()
+            for paths in self.config.paths.values():
+                result = paths[0]
+                for pattern in paths[1:]:
+                    aliases.add(pattern, result)
+
+        combine_parallel_data(
+            self._data,
+            aliases=aliases,
+            data_paths=data_paths,
+            strict=strict,
+            keep=keep,
+        )
+
+    def get_data(self):
+        """Get the collected data.
+
+        Also warn about various problems collecting data.
+
+        Returns a :class:`coverage.CoverageData`, the collected coverage data.
+
+        .. versionadded:: 4.0
+
+        """
+        self._init()
+        self._init_data(suffix=None)
+        self._post_init()
+
+        for plugin in self._plugins:
+            if not plugin._coverage_enabled:
+                self._collector.plugin_was_disabled(plugin)
+
+        if self._collector and self._collector.flush_data():
+            self._post_save_work()
+
+        return self._data
+
+    def _post_save_work(self):
+        """After saving data, look for warnings, post-work, etc.
+
+        Warn about things that should have happened but didn't.
+        Look for unexecuted files.
+
+        """
+        # If there are still entries in the source_pkgs_unmatched list,
+        # then we never encountered those packages.
+        if self._warn_unimported_source:
+            self._inorout.warn_unimported_source()
+
+        # Find out if we got any data.
+        if not self._data and self._warn_no_data:
+            self._warn("No data was collected.", slug="no-data-collected")
+
+        # Touch all the files that could have executed, so that we can
+        # mark completely unexecuted files as 0% covered.
+        if self._data is not None:
+            file_paths = collections.defaultdict(list)
+            for file_path, plugin_name in self._inorout.find_possibly_unexecuted_files():
+                file_path = self._file_mapper(file_path)
+                file_paths[plugin_name].append(file_path)
+            for plugin_name, paths in file_paths.items():
+                self._data.touch_files(paths, plugin_name)
+
+        if self.config.note:
+            self._warn("The '[run] note' setting is no longer supported.")
+
+    # Backward compatibility with version 1.
+    def analysis(self, morf):
+        """Like `analysis2` but doesn't return excluded line numbers."""
+        f, s, _, m, mf = self.analysis2(morf)
+        return f, s, m, mf
+
+    def analysis2(self, morf):
+        """Analyze a module.
+
+        `morf` is a module or a file name.  It will be analyzed to determine
+        its coverage statistics.  The return value is a 5-tuple:
+
+        * The file name for the module.
+        * A list of line numbers of executable statements.
+        * A list of line numbers of excluded statements.
+        * A list of line numbers of statements not run (missing from
+          execution).
+        * A readable formatted string of the missing line numbers.
+
+        The analysis uses the source file itself and the current measured
+        coverage data.
+
+        """
+        analysis = self._analyze(morf)
+        return (
+            analysis.filename,
+            sorted(analysis.statements),
+            sorted(analysis.excluded),
+            sorted(analysis.missing),
+            analysis.missing_formatted(),
+            )
+
+    def _analyze(self, it):
+        """Analyze a single morf or code unit.
+
+        Returns an `Analysis` object.
+
+        """
+        # All reporting comes through here, so do reporting initialization.
+        self._init()
+        Numbers.set_precision(self.config.precision)
+        self._post_init()
+
+        data = self.get_data()
+        if not isinstance(it, FileReporter):
+            it = self._get_file_reporter(it)
+
+        return Analysis(data, it, self._file_mapper)
+
+    def _get_file_reporter(self, morf):
+        """Get a FileReporter for a module or file name."""
+        plugin = None
+        file_reporter = "python"
+
+        if isinstance(morf, string_class):
+            if getattr(sys, 'is_standalone_binary', False):
+                # Leave morf in canonical format - relative to the arcadia root
+                mapped_morf = morf
+            else:
+                mapped_morf = self._file_mapper(morf)
+            plugin_name = self._data.file_tracer(mapped_morf)
+            if plugin_name:
+                plugin = self._plugins.get(plugin_name)
+
+                if plugin:
+                    file_reporter = plugin.file_reporter(mapped_morf)
+                    if file_reporter is None:
+                        raise CoverageException(
+                            "Plugin %r did not provide a file reporter for %r." % (
+                                plugin._coverage_plugin_name, morf
+                            )
+                        )
+
+        if file_reporter == "python":
+            file_reporter = PythonFileReporter(morf, self)
+
+        return file_reporter
+
+    def _get_file_reporters(self, morfs=None):
+        """Get a list of FileReporters for a list of modules or file names.
+
+        For each module or file name in `morfs`, find a FileReporter.  Return
+        the list of FileReporters.
+
+        If `morfs` is a single module or file name, this returns a list of one
+        FileReporter.  If `morfs` is empty or None, then the list of all files
+        measured is used to find the FileReporters.
+
+        """
+        if not morfs:
+            morfs = self._data.measured_files()
+
+        # Be sure we have a collection.
+        if not isinstance(morfs, (list, tuple, set)):
+            morfs = [morfs]
+
+        file_reporters = [self._get_file_reporter(morf) for morf in morfs]
+        return file_reporters
+
+    def report(
+        self, morfs=None, show_missing=None, ignore_errors=None,
+        file=None, omit=None, include=None, skip_covered=None,
+        contexts=None, skip_empty=None, precision=None, sort=None
+    ):
+        """Write a textual summary report to `file`.
+
+        Each module in `morfs` is listed, with counts of statements, executed
+        statements, missing statements, and a list of lines missed.
+
+        If `show_missing` is true, then details of which lines or branches are
+        missing will be included in the report.  If `ignore_errors` is true,
+        then a failure while reporting a single file will not stop the entire
+        report.
+
+        `file` is a file-like object, suitable for writing.
+
+        `include` is a list of file name patterns.  Files that match will be
+        included in the report. Files matching `omit` will not be included in
+        the report.
+
+        If `skip_covered` is true, don't report on files with 100% coverage.
+
+        If `skip_empty` is true, don't report on empty files (those that have
+        no statements).
+
+        `contexts` is a list of regular expressions.  Only data from
+        :ref:`dynamic contexts <dynamic_contexts>` that match one of those
+        expressions (using :func:`re.search <python:re.search>`) will be
+        included in the report.
+
+        `precision` is the number of digits to display after the decimal
+        point for percentages.
+
+        All of the arguments default to the settings read from the
+        :ref:`configuration file <config>`.
+
+        Returns a float, the total percentage covered.
+
+        .. versionadded:: 4.0
+            The `skip_covered` parameter.
+
+        .. versionadded:: 5.0
+            The `contexts` and `skip_empty` parameters.
+
+        .. versionadded:: 5.2
+            The `precision` parameter.
+
+        """
+        with override_config(
+            self,
+            ignore_errors=ignore_errors, report_omit=omit, report_include=include,
+            show_missing=show_missing, skip_covered=skip_covered,
+            report_contexts=contexts, skip_empty=skip_empty, precision=precision,
+            sort=sort
+        ):
+            reporter = SummaryReporter(self)
+            return reporter.report(morfs, outfile=file)
+
+    def annotate(
+        self, morfs=None, directory=None, ignore_errors=None,
+        omit=None, include=None, contexts=None,
+    ):
+        """Annotate a list of modules.
+
+        Each module in `morfs` is annotated.  The source is written to a new
+        file, named with a ",cover" suffix, with each line prefixed with a
+        marker to indicate the coverage of the line.  Covered lines have ">",
+        excluded lines have "-", and missing lines have "!".
+
+        See :meth:`report` for other arguments.
+
+        """
+        with override_config(self,
+            ignore_errors=ignore_errors, report_omit=omit,
+            report_include=include, report_contexts=contexts,
+        ):
+            reporter = AnnotateReporter(self)
+            reporter.report(morfs, directory=directory)
+
+    def html_report(
+        self, morfs=None, directory=None, ignore_errors=None,
+        omit=None, include=None, extra_css=None, title=None,
+        skip_covered=None, show_contexts=None, contexts=None,
+        skip_empty=None, precision=None,
+    ):
+        """Generate an HTML report.
+
+        The HTML is written to `directory`.  The file "index.html" is the
+        overview starting point, with links to more detailed pages for
+        individual modules.
+
+        `extra_css` is a path to a file of other CSS to apply on the page.
+        It will be copied into the HTML directory.
+
+        `title` is a text string (not HTML) to use as the title of the HTML
+        report.
+
+        See :meth:`report` for other arguments.
+
+        Returns a float, the total percentage covered.
+
+        .. note::
+            The HTML report files are generated incrementally based on the
+            source files and coverage results. If you modify the report files,
+            the changes will not be considered.  You should be careful about
+            changing the files in the report folder.
+
+        """
+        with override_config(self,
+            ignore_errors=ignore_errors, report_omit=omit, report_include=include,
+            html_dir=directory, extra_css=extra_css, html_title=title,
+            html_skip_covered=skip_covered, show_contexts=show_contexts, report_contexts=contexts,
+            html_skip_empty=skip_empty, precision=precision,
+        ):
+            reporter = HtmlReporter(self)
+            return reporter.report(morfs)
+
+    def xml_report(
+        self, morfs=None, outfile=None, ignore_errors=None,
+        omit=None, include=None, contexts=None, skip_empty=None,
+    ):
+        """Generate an XML report of coverage results.
+
+        The report is compatible with Cobertura reports.
+
+        Each module in `morfs` is included in the report.  `outfile` is the
+        path to write the file to, "-" will write to stdout.
+
+        See :meth:`report` for other arguments.
+
+        Returns a float, the total percentage covered.
+
+        """
+        with override_config(self,
+            ignore_errors=ignore_errors, report_omit=omit, report_include=include,
+            xml_output=outfile, report_contexts=contexts, skip_empty=skip_empty,
+        ):
+            return render_report(self.config.xml_output, XmlReporter(self), morfs)
+
+    def json_report(
+        self, morfs=None, outfile=None, ignore_errors=None,
+        omit=None, include=None, contexts=None, pretty_print=None,
+        show_contexts=None
+    ):
+        """Generate a JSON report of coverage results.
+
+        Each module in `morfs` is included in the report.  `outfile` is the
+        path to write the file to, "-" will write to stdout.
+
+        See :meth:`report` for other arguments.
+
+        Returns a float, the total percentage covered.
+
+        .. versionadded:: 5.0
+
+        """
+        with override_config(self,
+            ignore_errors=ignore_errors, report_omit=omit, report_include=include,
+            json_output=outfile, report_contexts=contexts, json_pretty_print=pretty_print,
+            json_show_contexts=show_contexts
+        ):
+            return render_report(self.config.json_output, JsonReporter(self), morfs)
+
+    def sys_info(self):
+        """Return a list of (key, value) pairs showing internal information."""
+
+        import coverage as covmod
+
+        self._init()
+        self._post_init()
+
+        def plugin_info(plugins):
+            """Make an entry for the sys_info from a list of plug-ins."""
+            entries = []
+            for plugin in plugins:
+                entry = plugin._coverage_plugin_name
+                if not plugin._coverage_enabled:
+                    entry += " (disabled)"
+                entries.append(entry)
+            return entries
+
+        info = [
+            ('version', covmod.__version__),
+            ('coverage', covmod.__file__),
+            ('tracer', self._collector.tracer_name() if self._collector else "-none-"),
+            ('CTracer', 'available' if CTracer else "unavailable"),
+            ('plugins.file_tracers', plugin_info(self._plugins.file_tracers)),
+            ('plugins.configurers', plugin_info(self._plugins.configurers)),
+            ('plugins.context_switchers', plugin_info(self._plugins.context_switchers)),
+            ('configs_attempted', self.config.attempted_config_files),
+            ('configs_read', self.config.config_files_read),
+            ('config_file', self.config.config_file),
+            ('config_contents',
+                repr(self.config._config_contents)
+                if self.config._config_contents
+                else '-none-'
+            ),
+            ('data_file', self._data.data_filename() if self._data is not None else "-none-"),
+            ('python', sys.version.replace('\n', '')),
+            ('platform', platform.platform()),
+            ('implementation', platform.python_implementation()),
+            ('executable', sys.executable),
+            ('def_encoding', sys.getdefaultencoding()),
+            ('fs_encoding', sys.getfilesystemencoding()),
+            ('pid', os.getpid()),
+            ('cwd', os.getcwd()),
+            ('path', sys.path),
+            ('environment', sorted(
+                ("%s = %s" % (k, v))
+                for k, v in iitems(os.environ)
+                if any(slug in k for slug in ("COV", "PY"))
+            )),
+            ('command_line', " ".join(getattr(sys, 'argv', ['-none-']))),
+            ]
+
+        if self._inorout:
+            info.extend(self._inorout.sys_info())
+
+        info.extend(CoverageData.sys_info())
+
+        return info
+
+
+# Mega debugging...
+# $set_env.py: COVERAGE_DEBUG_CALLS - Lots and lots of output about calls to Coverage.
+if int(os.environ.get("COVERAGE_DEBUG_CALLS", 0)):              # pragma: debugging
+    from coverage.debug import decorate_methods, show_calls
+
+    Coverage = decorate_methods(show_calls(show_args=True), butnot=['get_data'])(Coverage)
+
+
+def process_startup():
+    """Call this at Python start-up to perhaps measure coverage.
+
+    If the environment variable COVERAGE_PROCESS_START is defined, coverage
+    measurement is started.  The value of the variable is the config file
+    to use.
+
+    There are two ways to configure your Python installation to invoke this
+    function when Python starts:
+
+    #. Create or append to sitecustomize.py to add these lines::
+
+        import coverage
+        coverage.process_startup()
+
+    #. Create a .pth file in your Python installation containing::
+
+        import coverage; coverage.process_startup()
+
+    Returns the :class:`Coverage` instance that was started, or None if it was
+    not started by this call.
+
+    """
+    cps = os.environ.get("COVERAGE_PROCESS_START")
+    if not cps:
+        # No request for coverage, nothing to do.
+        return None
+
+    # This function can be called more than once in a process. This happens
+    # because some virtualenv configurations make the same directory visible
+    # twice in sys.path.  This means that the .pth file will be found twice,
+    # and executed twice, executing this function twice.  We set a global
+    # flag (an attribute on this function) to indicate that coverage.py has
+    # already been started, so we can avoid doing it twice.
+    #
+    # https://github.com/nedbat/coveragepy/issues/340 has more details.
+
+    if hasattr(process_startup, "coverage"):
+        # We've annotated this function before, so we must have already
+        # started coverage.py in this process.  Nothing to do.
+        return None
+
+    cov = Coverage(config_file=cps)
+    process_startup.coverage = cov
+    cov._warn_no_data = False
+    cov._warn_unimported_source = False
+    cov._warn_preimported_source = False
+    cov._auto_save = True
+    cov.start()
+
+    return cov
+
+
+def _prevent_sub_process_measurement():
+    """Stop any subprocess auto-measurement from writing data."""
+    auto_created_coverage = getattr(process_startup, "coverage", None)
+    if auto_created_coverage is not None:
+        auto_created_coverage._auto_save = False
diff --git a/contrib/python/coverage/py3/coverage/ctracer/datastack.c b/contrib/python/coverage/py3/coverage/ctracer/datastack.c
new file mode 100644
index 0000000000..a9cfcc2cf2
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/datastack.c
@@ -0,0 +1,50 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+#include "util.h"
+#include "datastack.h"
+
+#define STACK_DELTA    20
+
+int
+DataStack_init(Stats *pstats, DataStack *pdata_stack)
+{
+    pdata_stack->depth = -1;
+    pdata_stack->stack = NULL;
+    pdata_stack->alloc = 0;
+    return RET_OK;
+}
+
+void
+DataStack_dealloc(Stats *pstats, DataStack *pdata_stack)
+{
+    int i;
+
+    for (i = 0; i < pdata_stack->alloc; i++) {
+        Py_XDECREF(pdata_stack->stack[i].file_data);
+    }
+    PyMem_Free(pdata_stack->stack);
+}
+
+int
+DataStack_grow(Stats *pstats, DataStack *pdata_stack)
+{
+    pdata_stack->depth++;
+    if (pdata_stack->depth >= pdata_stack->alloc) {
+        /* We've outgrown our data_stack array: make it bigger. */
+        int bigger = pdata_stack->alloc + STACK_DELTA;
+        DataStackEntry * bigger_data_stack = PyMem_Realloc(pdata_stack->stack, bigger * sizeof(DataStackEntry));
+        STATS( pstats->stack_reallocs++; )
+        if (bigger_data_stack == NULL) {
+            PyErr_NoMemory();
+            pdata_stack->depth--;
+            return RET_ERROR;
+        }
+        /* Zero the new entries. */
+        memset(bigger_data_stack + pdata_stack->alloc, 0, STACK_DELTA * sizeof(DataStackEntry));
+
+        pdata_stack->stack = bigger_data_stack;
+        pdata_stack->alloc = bigger;
+    }
+    return RET_OK;
+}
diff --git a/contrib/python/coverage/py3/coverage/ctracer/datastack.h b/contrib/python/coverage/py3/coverage/ctracer/datastack.h
new file mode 100644
index 0000000000..3b3078ba27
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/datastack.h
@@ -0,0 +1,45 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+#ifndef _COVERAGE_DATASTACK_H
+#define _COVERAGE_DATASTACK_H
+
+#include "util.h"
+#include "stats.h"
+
+/* An entry on the data stack.  For each call frame, we need to record all
+ * the information needed for CTracer_handle_line to operate as quickly as
+ * possible.
+ */
+typedef struct DataStackEntry {
+    /* The current file_data dictionary. Owned. */
+    PyObject * file_data;
+
+    /* The disposition object for this frame. A borrowed instance of CFileDisposition. */
+    PyObject * disposition;
+
+    /* The FileTracer handling this frame, or None if it's Python.  Borrowed. */
+    PyObject * file_tracer;
+
+    /* The line number of the last line recorded, for tracing arcs.
+        -1 means there was no previous line, as when entering a code object.
+    */
+    int last_line;
+
+    BOOL started_context;
+} DataStackEntry;
+
+/* A data stack is a dynamically allocated vector of DataStackEntry's. */
+typedef struct DataStack {
+    int depth;      /* The index of the last-used entry in stack. */
+    int alloc;      /* number of entries allocated at stack. */
+    /* The file data at each level, or NULL if not recording. */
+    DataStackEntry * stack;
+} DataStack;
+
+
+int DataStack_init(Stats * pstats, DataStack *pdata_stack);
+void DataStack_dealloc(Stats * pstats, DataStack *pdata_stack);
+int DataStack_grow(Stats * pstats, DataStack *pdata_stack);
+
+#endif /* _COVERAGE_DATASTACK_H */
diff --git a/contrib/python/coverage/py3/coverage/ctracer/filedisp.c b/contrib/python/coverage/py3/coverage/ctracer/filedisp.c
new file mode 100644
index 0000000000..47782ae090
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/filedisp.c
@@ -0,0 +1,85 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+#include "util.h"
+#include "filedisp.h"
+
+void
+CFileDisposition_dealloc(CFileDisposition *self)
+{
+    Py_XDECREF(self->original_filename);
+    Py_XDECREF(self->canonical_filename);
+    Py_XDECREF(self->source_filename);
+    Py_XDECREF(self->trace);
+    Py_XDECREF(self->reason);
+    Py_XDECREF(self->file_tracer);
+    Py_XDECREF(self->has_dynamic_filename);
+}
+
+static PyMemberDef
+CFileDisposition_members[] = {
+    { "original_filename",      T_OBJECT, offsetof(CFileDisposition, original_filename), 0,
+            PyDoc_STR("") },
+
+    { "canonical_filename",     T_OBJECT, offsetof(CFileDisposition, canonical_filename), 0,
+            PyDoc_STR("") },
+
+    { "source_filename",        T_OBJECT, offsetof(CFileDisposition, source_filename), 0,
+            PyDoc_STR("") },
+
+    { "trace",                  T_OBJECT, offsetof(CFileDisposition, trace), 0,
+            PyDoc_STR("") },
+
+    { "reason",                 T_OBJECT, offsetof(CFileDisposition, reason), 0,
+            PyDoc_STR("") },
+
+    { "file_tracer",            T_OBJECT, offsetof(CFileDisposition, file_tracer), 0,
+            PyDoc_STR("") },
+
+    { "has_dynamic_filename",   T_OBJECT, offsetof(CFileDisposition, has_dynamic_filename), 0,
+            PyDoc_STR("") },
+
+    { NULL }
+};
+
+PyTypeObject
+CFileDispositionType = {
+    MyType_HEAD_INIT
+    "coverage.CFileDispositionType",        /*tp_name*/
+    sizeof(CFileDisposition),  /*tp_basicsize*/
+    0,                         /*tp_itemsize*/
+    (destructor)CFileDisposition_dealloc, /*tp_dealloc*/
+    0,                         /*tp_print*/
+    0,                         /*tp_getattr*/
+    0,                         /*tp_setattr*/
+    0,                         /*tp_compare*/
+    0,                         /*tp_repr*/
+    0,                         /*tp_as_number*/
+    0,                         /*tp_as_sequence*/
+    0,                         /*tp_as_mapping*/
+    0,                         /*tp_hash */
+    0,                         /*tp_call*/
+    0,                         /*tp_str*/
+    0,                         /*tp_getattro*/
+    0,                         /*tp_setattro*/
+    0,                         /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+    "CFileDisposition objects", /* tp_doc */
+    0,                         /* tp_traverse */
+    0,                         /* tp_clear */
+    0,                         /* tp_richcompare */
+    0,                         /* tp_weaklistoffset */
+    0,                         /* tp_iter */
+    0,                         /* tp_iternext */
+    0,                         /* tp_methods */
+    CFileDisposition_members,  /* tp_members */
+    0,                         /* tp_getset */
+    0,                         /* tp_base */
+    0,                         /* tp_dict */
+    0,                         /* tp_descr_get */
+    0,                         /* tp_descr_set */
+    0,                         /* tp_dictoffset */
+    0,                         /* tp_init */
+    0,                         /* tp_alloc */
+    0,                         /* tp_new */
+};
diff --git a/contrib/python/coverage/py3/coverage/ctracer/filedisp.h b/contrib/python/coverage/py3/coverage/ctracer/filedisp.h
new file mode 100644
index 0000000000..860f9a50b1
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/filedisp.h
@@ -0,0 +1,26 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+#ifndef _COVERAGE_FILEDISP_H
+#define _COVERAGE_FILEDISP_H
+
+#include "util.h"
+#include "structmember.h"
+
+typedef struct CFileDisposition {
+    PyObject_HEAD
+
+    PyObject * original_filename;
+    PyObject * canonical_filename;
+    PyObject * source_filename;
+    PyObject * trace;
+    PyObject * reason;
+    PyObject * file_tracer;
+    PyObject * has_dynamic_filename;
+} CFileDisposition;
+
+void CFileDisposition_dealloc(CFileDisposition *self);
+
+extern PyTypeObject CFileDispositionType;
+
+#endif /* _COVERAGE_FILEDISP_H */
diff --git a/contrib/python/coverage/py3/coverage/ctracer/module.c b/contrib/python/coverage/py3/coverage/ctracer/module.c
new file mode 100644
index 0000000000..f308902b69
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/module.c
@@ -0,0 +1,108 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+#include "util.h"
+#include "tracer.h"
+#include "filedisp.h"
+
+/* Module definition */
+
+#define MODULE_DOC PyDoc_STR("Fast coverage tracer.")
+
+#if PY_MAJOR_VERSION >= 3
+
+static PyModuleDef
+moduledef = {
+    PyModuleDef_HEAD_INIT,
+    "coverage.tracer",
+    MODULE_DOC,
+    -1,
+    NULL,       /* methods */
+    NULL,
+    NULL,       /* traverse */
+    NULL,       /* clear */
+    NULL
+};
+
+
+PyObject *
+PyInit_tracer(void)
+{
+    PyObject * mod = PyModule_Create(&moduledef);
+    if (mod == NULL) {
+        return NULL;
+    }
+
+    if (CTracer_intern_strings() < 0) {
+        return NULL;
+    }
+
+    /* Initialize CTracer */
+    CTracerType.tp_new = PyType_GenericNew;
+    if (PyType_Ready(&CTracerType) < 0) {
+        Py_DECREF(mod);
+        return NULL;
+    }
+
+    Py_INCREF(&CTracerType);
+    if (PyModule_AddObject(mod, "CTracer", (PyObject *)&CTracerType) < 0) {
+        Py_DECREF(mod);
+        Py_DECREF(&CTracerType);
+        return NULL;
+    }
+
+    /* Initialize CFileDisposition */
+    CFileDispositionType.tp_new = PyType_GenericNew;
+    if (PyType_Ready(&CFileDispositionType) < 0) {
+        Py_DECREF(mod);
+        Py_DECREF(&CTracerType);
+        return NULL;
+    }
+
+    Py_INCREF(&CFileDispositionType);
+    if (PyModule_AddObject(mod, "CFileDisposition", (PyObject *)&CFileDispositionType) < 0) {
+        Py_DECREF(mod);
+        Py_DECREF(&CTracerType);
+        Py_DECREF(&CFileDispositionType);
+        return NULL;
+    }
+
+    return mod;
+}
+
+#else
+
+void
+inittracer(void)
+{
+    PyObject * mod;
+
+    mod = Py_InitModule3("coverage.tracer", NULL, MODULE_DOC);
+    if (mod == NULL) {
+        return;
+    }
+
+    if (CTracer_intern_strings() < 0) {
+        return;
+    }
+
+    /* Initialize CTracer */
+    CTracerType.tp_new = PyType_GenericNew;
+    if (PyType_Ready(&CTracerType) < 0) {
+        return;
+    }
+
+    Py_INCREF(&CTracerType);
+    PyModule_AddObject(mod, "CTracer", (PyObject *)&CTracerType);
+
+    /* Initialize CFileDisposition */
+    CFileDispositionType.tp_new = PyType_GenericNew;
+    if (PyType_Ready(&CFileDispositionType) < 0) {
+        return;
+    }
+
+    Py_INCREF(&CFileDispositionType);
+    PyModule_AddObject(mod, "CFileDisposition", (PyObject *)&CFileDispositionType);
+}
+
+#endif /* Py3k */
diff --git a/contrib/python/coverage/py3/coverage/ctracer/stats.h b/contrib/python/coverage/py3/coverage/ctracer/stats.h
new file mode 100644
index 0000000000..05173369f7
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/stats.h
@@ -0,0 +1,31 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+#ifndef _COVERAGE_STATS_H
+#define _COVERAGE_STATS_H
+
+#include "util.h"
+
+#if COLLECT_STATS
+#define STATS(x)        x
+#else
+#define STATS(x)
+#endif
+
+typedef struct Stats {
+    unsigned int calls;     /* Need at least one member, but the rest only if needed. */
+#if COLLECT_STATS
+    unsigned int lines;
+    unsigned int returns;
+    unsigned int exceptions;
+    unsigned int others;
+    unsigned int files;
+    unsigned int missed_returns;
+    unsigned int stack_reallocs;
+    unsigned int errors;
+    unsigned int pycalls;
+    unsigned int start_context_calls;
+#endif
+} Stats;
+
+#endif /* _COVERAGE_STATS_H */
diff --git a/contrib/python/coverage/py3/coverage/ctracer/tracer.c b/contrib/python/coverage/py3/coverage/ctracer/tracer.c
new file mode 100644
index 0000000000..3e776958cd
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/tracer.c
@@ -0,0 +1,1149 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+/* C-based Tracer for coverage.py. */
+
+#include "util.h"
+#include "datastack.h"
+#include "filedisp.h"
+#include "tracer.h"
+
+/* Python C API helpers. */
+
+static int
+pyint_as_int(PyObject * pyint, int *pint)
+{
+    int the_int = MyInt_AsInt(pyint);
+    if (the_int == -1 && PyErr_Occurred()) {
+        return RET_ERROR;
+    }
+
+    *pint = the_int;
+    return RET_OK;
+}
+
+
+/* Interned strings to speed GetAttr etc. */
+
+static PyObject *str_trace;
+static PyObject *str_file_tracer;
+static PyObject *str__coverage_enabled;
+static PyObject *str__coverage_plugin;
+static PyObject *str__coverage_plugin_name;
+static PyObject *str_dynamic_source_filename;
+static PyObject *str_line_number_range;
+
+int
+CTracer_intern_strings(void)
+{
+    int ret = RET_ERROR;
+
+#define INTERN_STRING(v, s)                     \
+    v = MyText_InternFromString(s);             \
+    if (v == NULL) {                            \
+        goto error;                             \
+    }
+
+    INTERN_STRING(str_trace, "trace")
+    INTERN_STRING(str_file_tracer, "file_tracer")
+    INTERN_STRING(str__coverage_enabled, "_coverage_enabled")
+    INTERN_STRING(str__coverage_plugin, "_coverage_plugin")
+    INTERN_STRING(str__coverage_plugin_name, "_coverage_plugin_name")
+    INTERN_STRING(str_dynamic_source_filename, "dynamic_source_filename")
+    INTERN_STRING(str_line_number_range, "line_number_range")
+
+    ret = RET_OK;
+
+error:
+    return ret;
+}
+
+static void CTracer_disable_plugin(CTracer *self, PyObject * disposition);
+
+static int
+CTracer_init(CTracer *self, PyObject *args_unused, PyObject *kwds_unused)
+{
+    int ret = RET_ERROR;
+
+    if (DataStack_init(&self->stats, &self->data_stack) < 0) {
+        goto error;
+    }
+
+    self->pdata_stack = &self->data_stack;
+
+    self->context = Py_None;
+    Py_INCREF(self->context);
+
+    ret = RET_OK;
+    goto ok;
+
+error:
+    STATS( self->stats.errors++; )
+
+ok:
+    return ret;
+}
+
+static void
+CTracer_dealloc(CTracer *self)
+{
+    int i;
+
+    if (self->started) {
+        PyEval_SetTrace(NULL, NULL);
+    }
+
+    Py_XDECREF(self->should_trace);
+    Py_XDECREF(self->check_include);
+    Py_XDECREF(self->warn);
+    Py_XDECREF(self->concur_id_func);
+    Py_XDECREF(self->data);
+    Py_XDECREF(self->file_tracers);
+    Py_XDECREF(self->should_trace_cache);
+    Py_XDECREF(self->should_start_context);
+    Py_XDECREF(self->switch_context);
+    Py_XDECREF(self->context);
+    Py_XDECREF(self->disable_plugin);
+
+    DataStack_dealloc(&self->stats, &self->data_stack);
+    if (self->data_stacks) {
+        for (i = 0; i < self->data_stacks_used; i++) {
+            DataStack_dealloc(&self->stats, self->data_stacks + i);
+        }
+        PyMem_Free(self->data_stacks);
+    }
+
+    Py_XDECREF(self->data_stack_index);
+
+    Py_TYPE(self)->tp_free((PyObject*)self);
+}
+
+#if TRACE_LOG
+static const char *
+indent(int n)
+{
+    static const char * spaces =
+        "                                                                    "
+        "                                                                    "
+        "                                                                    "
+        "                                                                    "
+        ;
+    return spaces + strlen(spaces) - n*2;
+}
+
+static BOOL logging = FALSE;
+/* Set these constants to be a file substring and line number to start logging. */
+static const char * start_file = "tests/views";
+static int start_line = 27;
+
+static void
+showlog(int depth, int lineno, PyObject * filename, const char * msg)
+{
+    if (logging) {
+        printf("%s%3d ", indent(depth), depth);
+        if (lineno) {
+            printf("%4d", lineno);
+        }
+        else {
+            printf("    ");
+        }
+        if (filename) {
+            PyObject *ascii = MyText_AS_BYTES(filename);
+            printf(" %s", MyBytes_AS_STRING(ascii));
+            Py_DECREF(ascii);
+        }
+        if (msg) {
+            printf(" %s", msg);
+        }
+        printf("\n");
+    }
+}
+
+#define SHOWLOG(a,b,c,d)    showlog(a,b,c,d)
+#else
+#define SHOWLOG(a,b,c,d)
+#endif /* TRACE_LOG */
+
+#if WHAT_LOG
+static const char * what_sym[] = {"CALL", "EXC ", "LINE", "RET "};
+#endif
+
+/* Record a pair of integers in self->pcur_entry->file_data. */
+static int
+CTracer_record_pair(CTracer *self, int l1, int l2)
+{
+    int ret = RET_ERROR;
+
+    PyObject * t = NULL;
+
+    t = Py_BuildValue("(ii)", l1, l2);
+    if (t == NULL) {
+        goto error;
+    }
+
+    if (PyDict_SetItem(self->pcur_entry->file_data, t, Py_None) < 0) {
+        goto error;
+    }
+
+    ret = RET_OK;
+
+error:
+    Py_XDECREF(t);
+
+    return ret;
+}
+
+/* Set self->pdata_stack to the proper data_stack to use. */
+static int
+CTracer_set_pdata_stack(CTracer *self)
+{
+    int ret = RET_ERROR;
+    PyObject * co_obj = NULL;
+    PyObject * stack_index = NULL;
+
+    if (self->concur_id_func != Py_None) {
+        int the_index = 0;
+
+        if (self->data_stack_index == NULL) {
+            PyObject * weakref = NULL;
+
+            weakref = PyImport_ImportModule("weakref");
+            if (weakref == NULL) {
+                goto error;
+            }
+            STATS( self->stats.pycalls++; )
+            self->data_stack_index = PyObject_CallMethod(weakref, "WeakKeyDictionary", NULL);
+            Py_XDECREF(weakref);
+
+            if (self->data_stack_index == NULL) {
+                goto error;
+            }
+        }
+
+        STATS( self->stats.pycalls++; )
+        co_obj = PyObject_CallObject(self->concur_id_func, NULL);
+        if (co_obj == NULL) {
+            goto error;
+        }
+        stack_index = PyObject_GetItem(self->data_stack_index, co_obj);
+        if (stack_index == NULL) {
+            /* PyObject_GetItem sets an exception if it didn't find the thing. */
+            PyErr_Clear();
+
+            /* A new concurrency object.  Make a new data stack. */
+            the_index = self->data_stacks_used;
+            stack_index = MyInt_FromInt(the_index);
+            if (stack_index == NULL) {
+                goto error;
+            }
+            if (PyObject_SetItem(self->data_stack_index, co_obj, stack_index) < 0) {
+                goto error;
+            }
+            self->data_stacks_used++;
+            if (self->data_stacks_used >= self->data_stacks_alloc) {
+                int bigger = self->data_stacks_alloc + 10;
+                DataStack * bigger_stacks = PyMem_Realloc(self->data_stacks, bigger * sizeof(DataStack));
+                if (bigger_stacks == NULL) {
+                    PyErr_NoMemory();
+                    goto error;
+                }
+                self->data_stacks = bigger_stacks;
+                self->data_stacks_alloc = bigger;
+            }
+            DataStack_init(&self->stats, &self->data_stacks[the_index]);
+        }
+        else {
+            if (pyint_as_int(stack_index, &the_index) < 0) {
+                goto error;
+            }
+        }
+
+        self->pdata_stack = &self->data_stacks[the_index];
+    }
+    else {
+        self->pdata_stack = &self->data_stack;
+    }
+
+    ret = RET_OK;
+
+error:
+
+    Py_XDECREF(co_obj);
+    Py_XDECREF(stack_index);
+
+    return ret;
+}
+
+/*
+ * Parts of the trace function.
+ */
+
+static int
+CTracer_check_missing_return(CTracer *self, PyFrameObject *frame)
+{
+    int ret = RET_ERROR;
+
+    if (self->last_exc_back) {
+        if (frame == self->last_exc_back) {
+            /* Looks like someone forgot to send a return event. We'll clear
+               the exception state and do the RETURN code here.  Notice that the
+               frame we have in hand here is not the correct frame for the RETURN,
+               that frame is gone.  Our handling for RETURN doesn't need the
+               actual frame, but we do log it, so that will look a little off if
+               you're looking at the detailed log.
+
+               If someday we need to examine the frame when doing RETURN, then
+               we'll need to keep more of the missed frame's state.
+            */
+            STATS( self->stats.missed_returns++; )
+            if (CTracer_set_pdata_stack(self) < 0) {
+                goto error;
+            }
+            if (self->pdata_stack->depth >= 0) {
+                if (self->tracing_arcs && self->pcur_entry->file_data) {
+                    if (CTracer_record_pair(self, self->pcur_entry->last_line, -self->last_exc_firstlineno) < 0) {
+                        goto error;
+                    }
+                }
+                SHOWLOG(self->pdata_stack->depth, PyFrame_GetLineNumber(frame), MyFrame_GetCode(frame)->co_filename, "missedreturn");
+                self->pdata_stack->depth--;
+                self->pcur_entry = &self->pdata_stack->stack[self->pdata_stack->depth];
+            }
+        }
+        self->last_exc_back = NULL;
+    }
+
+    ret = RET_OK;
+
+error:
+
+    return ret;
+}
+
+static int
+CTracer_handle_call(CTracer *self, PyFrameObject *frame)
+{
+    int ret = RET_ERROR;
+    int ret2;
+
+    /* Owned references that we clean up at the very end of the function. */
+    PyObject * disposition = NULL;
+    PyObject * plugin = NULL;
+    PyObject * plugin_name = NULL;
+    PyObject * next_tracename = NULL;
+
+    /* Borrowed references. */
+    PyObject * filename = NULL;
+    PyObject * disp_trace = NULL;
+    PyObject * tracename = NULL;
+    PyObject * file_tracer = NULL;
+    PyObject * has_dynamic_filename = NULL;
+
+    CFileDisposition * pdisp = NULL;
+
+    STATS( self->stats.calls++; )
+
+    /* Grow the stack. */
+    if (CTracer_set_pdata_stack(self) < 0) {
+        goto error;
+    }
+    if (DataStack_grow(&self->stats, self->pdata_stack) < 0) {
+        goto error;
+    }
+    self->pcur_entry = &self->pdata_stack->stack[self->pdata_stack->depth];
+
+    /* See if this frame begins a new context. */
+    if (self->should_start_context != Py_None && self->context == Py_None) {
+        PyObject * context;
+        /* We're looking for our context, ask should_start_context if this is the start. */
+        STATS( self->stats.start_context_calls++; )
+        STATS( self->stats.pycalls++; )
+        context = PyObject_CallFunctionObjArgs(self->should_start_context, frame, NULL);
+        if (context == NULL) {
+            goto error;
+        }
+        if (context != Py_None) {
+            PyObject * val;
+            Py_DECREF(self->context);
+            self->context = context;
+            self->pcur_entry->started_context = TRUE;
+            STATS( self->stats.pycalls++; )
+            val = PyObject_CallFunctionObjArgs(self->switch_context, context, NULL);
+            if (val == NULL) {
+                goto error;
+            }
+            Py_DECREF(val);
+        }
+        else {
+            Py_DECREF(context);
+            self->pcur_entry->started_context = FALSE;
+        }
+    }
+    else {
+        self->pcur_entry->started_context = FALSE;
+    }
+
+    /* Check if we should trace this line. */
+    filename = MyFrame_GetCode(frame)->co_filename;
+    disposition = PyDict_GetItem(self->should_trace_cache, filename);
+    if (disposition == NULL) {
+        if (PyErr_Occurred()) {
+            goto error;
+        }
+        STATS( self->stats.files++; )
+
+        /* We've never considered this file before. */
+        /* Ask should_trace about it. */
+        STATS( self->stats.pycalls++; )
+        disposition = PyObject_CallFunctionObjArgs(self->should_trace, filename, frame, NULL);
+        if (disposition == NULL) {
+            /* An error occurred inside should_trace. */
+            goto error;
+        }
+        if (PyDict_SetItem(self->should_trace_cache, filename, disposition) < 0) {
+            goto error;
+        }
+    }
+    else {
+        Py_INCREF(disposition);
+    }
+
+    if (disposition == Py_None) {
+        /* A later check_include returned false, so don't trace it. */
+        disp_trace = Py_False;
+    }
+    else {
+        /* The object we got is a CFileDisposition, use it efficiently. */
+        pdisp = (CFileDisposition *) disposition;
+        disp_trace = pdisp->trace;
+        if (disp_trace == NULL) {
+            goto error;
+        }
+    }
+
+    if (disp_trace == Py_True) {
+        /* If tracename is a string, then we're supposed to trace. */
+        tracename = pdisp->source_filename;
+        if (tracename == NULL) {
+            goto error;
+        }
+        file_tracer = pdisp->file_tracer;
+        if (file_tracer == NULL) {
+            goto error;
+        }
+        if (file_tracer != Py_None) {
+            plugin = PyObject_GetAttr(file_tracer, str__coverage_plugin);
+            if (plugin == NULL) {
+                goto error;
+            }
+            plugin_name = PyObject_GetAttr(plugin, str__coverage_plugin_name);
+            if (plugin_name == NULL) {
+                goto error;
+            }
+        }
+        has_dynamic_filename = pdisp->has_dynamic_filename;
+        if (has_dynamic_filename == NULL) {
+            goto error;
+        }
+        if (has_dynamic_filename == Py_True) {
+            STATS( self->stats.pycalls++; )
+            next_tracename = PyObject_CallMethodObjArgs(
+                file_tracer, str_dynamic_source_filename,
+                tracename, frame, NULL
+                );
+            if (next_tracename == NULL) {
+                /* An exception from the function. Alert the user with a
+                 * warning and a traceback.
+                 */
+                CTracer_disable_plugin(self, disposition);
+                /* Because we handled the error, goto ok. */
+                goto ok;
+            }
+            tracename = next_tracename;
+
+            if (tracename != Py_None) {
+                /* Check the dynamic source filename against the include rules. */
+                PyObject * included = NULL;
+                int should_include;
+                included = PyDict_GetItem(self->should_trace_cache, tracename);
+                if (included == NULL) {
+                    PyObject * should_include_bool;
+                    if (PyErr_Occurred()) {
+                        goto error;
+                    }
+                    STATS( self->stats.files++; )
+                    STATS( self->stats.pycalls++; )
+                    should_include_bool = PyObject_CallFunctionObjArgs(self->check_include, tracename, frame, NULL);
+                    if (should_include_bool == NULL) {
+                        goto error;
+                    }
+                    should_include = (should_include_bool == Py_True);
+                    Py_DECREF(should_include_bool);
+                    if (PyDict_SetItem(self->should_trace_cache, tracename, should_include ? disposition : Py_None) < 0) {
+                        goto error;
+                    }
+                }
+                else {
+                    should_include = (included != Py_None);
+                }
+                if (!should_include) {
+                    tracename = Py_None;
+                }
+            }
+        }
+    }
+    else {
+        tracename = Py_None;
+    }
+
+    if (tracename != Py_None) {
+        PyObject * file_data = PyDict_GetItem(self->data, tracename);
+
+        if (file_data == NULL) {
+            if (PyErr_Occurred()) {
+                goto error;
+            }
+            file_data = PyDict_New();
+            if (file_data == NULL) {
+                goto error;
+            }
+            ret2 = PyDict_SetItem(self->data, tracename, file_data);
+            if (ret2 < 0) {
+                goto error;
+            }
+
+            /* If the disposition mentions a plugin, record that. */
+            if (file_tracer != Py_None) {
+                ret2 = PyDict_SetItem(self->file_tracers, tracename, plugin_name);
+                if (ret2 < 0) {
+                    goto error;
+                }
+            }
+        }
+        else {
+            /* PyDict_GetItem gives a borrowed reference. Own it. */
+            Py_INCREF(file_data);
+        }
+
+        Py_XDECREF(self->pcur_entry->file_data);
+        self->pcur_entry->file_data = file_data;
+        self->pcur_entry->file_tracer = file_tracer;
+
+        SHOWLOG(self->pdata_stack->depth, PyFrame_GetLineNumber(frame), filename, "traced");
+    }
+    else {
+        Py_XDECREF(self->pcur_entry->file_data);
+        self->pcur_entry->file_data = NULL;
+        self->pcur_entry->file_tracer = Py_None;
+        SHOWLOG(self->pdata_stack->depth, PyFrame_GetLineNumber(frame), filename, "skipped");
+    }
+
+    self->pcur_entry->disposition = disposition;
+
+    /* Make the frame right in case settrace(gettrace()) happens. */
+    Py_INCREF(self);
+    My_XSETREF(frame->f_trace, (PyObject*)self);
+
+    /* A call event is really a "start frame" event, and can happen for
+     * re-entering a generator also.  f_lasti is -1 for a true call, and a
+     * real byte offset for a generator re-entry.
+     */
+    if (MyFrame_GetLasti(frame) < 0) {
+        self->pcur_entry->last_line = -MyFrame_GetCode(frame)->co_firstlineno;
+    }
+    else {
+        self->pcur_entry->last_line = PyFrame_GetLineNumber(frame);
+    }
+
+ok:
+    ret = RET_OK;
+
+error:
+    Py_XDECREF(next_tracename);
+    Py_XDECREF(disposition);
+    Py_XDECREF(plugin);
+    Py_XDECREF(plugin_name);
+
+    return ret;
+}
+
+
+static void
+CTracer_disable_plugin(CTracer *self, PyObject * disposition)
+{
+    PyObject * ret;
+    PyErr_Print();
+
+    STATS( self->stats.pycalls++; )
+    ret = PyObject_CallFunctionObjArgs(self->disable_plugin, disposition, NULL);
+    if (ret == NULL) {
+        goto error;
+    }
+    Py_DECREF(ret);
+
+    return;
+
+error:
+    /* This function doesn't return a status, so if an error happens, print it,
+     * but don't interrupt the flow. */
+    /* PySys_WriteStderr is nicer, but is not in the public API. */
+    fprintf(stderr, "Error occurred while disabling plug-in:\n");
+    PyErr_Print();
+}
+
+
+static int
+CTracer_unpack_pair(CTracer *self, PyObject *pair, int *p_one, int *p_two)
+{
+    int ret = RET_ERROR;
+    int the_int;
+    PyObject * pyint = NULL;
+    int index;
+
+    if (!PyTuple_Check(pair) || PyTuple_Size(pair) != 2) {
+        PyErr_SetString(
+            PyExc_TypeError,
+            "line_number_range must return 2-tuple"
+            );
+        goto error;
+    }
+
+    for (index = 0; index < 2; index++) {
+        pyint = PyTuple_GetItem(pair, index);
+        if (pyint == NULL) {
+            goto error;
+        }
+        if (pyint_as_int(pyint, &the_int) < 0) {
+            goto error;
+        }
+        *(index == 0 ? p_one : p_two) = the_int;
+    }
+
+    ret = RET_OK;
+
+error:
+    return ret;
+}
+
+static int
+CTracer_handle_line(CTracer *self, PyFrameObject *frame)
+{
+    int ret = RET_ERROR;
+    int ret2;
+
+    STATS( self->stats.lines++; )
+    if (self->pdata_stack->depth >= 0) {
+        SHOWLOG(self->pdata_stack->depth, PyFrame_GetLineNumber(frame), MyFrame_GetCode(frame)->co_filename, "line");
+        if (self->pcur_entry->file_data) {
+            int lineno_from = -1;
+            int lineno_to = -1;
+
+            /* We're tracing in this frame: record something. */
+            if (self->pcur_entry->file_tracer != Py_None) {
+                PyObject * from_to = NULL;
+                STATS( self->stats.pycalls++; )
+                from_to = PyObject_CallMethodObjArgs(self->pcur_entry->file_tracer, str_line_number_range, frame, NULL);
+                if (from_to == NULL) {
+                    CTracer_disable_plugin(self, self->pcur_entry->disposition);
+                    goto ok;
+                }
+                ret2 = CTracer_unpack_pair(self, from_to, &lineno_from, &lineno_to);
+                Py_DECREF(from_to);
+                if (ret2 < 0) {
+                    CTracer_disable_plugin(self, self->pcur_entry->disposition);
+                    goto ok;
+                }
+            }
+            else {
+                lineno_from = lineno_to = PyFrame_GetLineNumber(frame);
+            }
+
+            if (lineno_from != -1) {
+                for (; lineno_from <= lineno_to; lineno_from++) {
+                    if (self->tracing_arcs) {
+                        /* Tracing arcs: key is (last_line,this_line). */
+                        if (CTracer_record_pair(self, self->pcur_entry->last_line, lineno_from) < 0) {
+                            goto error;
+                        }
+                    }
+                    else {
+                        /* Tracing lines: key is simply this_line. */
+                        PyObject * this_line = MyInt_FromInt(lineno_from);
+                        if (this_line == NULL) {
+                            goto error;
+                        }
+
+                        ret2 = PyDict_SetItem(self->pcur_entry->file_data, this_line, Py_None);
+                        Py_DECREF(this_line);
+                        if (ret2 < 0) {
+                            goto error;
+                        }
+                    }
+
+                    self->pcur_entry->last_line = lineno_from;
+                }
+            }
+        }
+    }
+
+ok:
+    ret = RET_OK;
+
+error:
+
+    return ret;
+}
+
+static int
+CTracer_handle_return(CTracer *self, PyFrameObject *frame)
+{
+    int ret = RET_ERROR;
+
+    STATS( self->stats.returns++; )
+    /* A near-copy of this code is above in the missing-return handler. */
+    if (CTracer_set_pdata_stack(self) < 0) {
+        goto error;
+    }
+    self->pcur_entry = &self->pdata_stack->stack[self->pdata_stack->depth];
+
+    if (self->pdata_stack->depth >= 0) {
+        if (self->tracing_arcs && self->pcur_entry->file_data) {
+            /* Need to distinguish between RETURN_VALUE and YIELD_VALUE. Read
+             * the current bytecode to see what it is.  In unusual circumstances
+             * (Cython code), co_code can be the empty string, so range-check
+             * f_lasti before reading the byte.
+             */
+            int bytecode = RETURN_VALUE;
+            PyObject * pCode = MyCode_GetCode(MyFrame_GetCode(frame));
+            int lasti = MyFrame_GetLasti(frame);
+
+            if (lasti < MyBytes_GET_SIZE(pCode)) {
+                bytecode = MyBytes_AS_STRING(pCode)[lasti];
+            }
+            if (bytecode != YIELD_VALUE) {
+                int first = MyFrame_GetCode(frame)->co_firstlineno;
+                if (CTracer_record_pair(self, self->pcur_entry->last_line, -first) < 0) {
+                    goto error;
+                }
+            }
+        }
+
+        /* If this frame started a context, then returning from it ends the context. */
+        if (self->pcur_entry->started_context) {
+            PyObject * val;
+            Py_DECREF(self->context);
+            self->context = Py_None;
+            Py_INCREF(self->context);
+            STATS( self->stats.pycalls++; )
+
+            val = PyObject_CallFunctionObjArgs(self->switch_context, self->context, NULL);
+            if (val == NULL) {
+                goto error;
+            }
+            Py_DECREF(val);
+        }
+
+        /* Pop the stack. */
+        SHOWLOG(self->pdata_stack->depth, PyFrame_GetLineNumber(frame), MyFrame_GetCode(frame)->co_filename, "return");
+        self->pdata_stack->depth--;
+        self->pcur_entry = &self->pdata_stack->stack[self->pdata_stack->depth];
+    }
+
+    ret = RET_OK;
+
+error:
+
+    return ret;
+}
+
+static int
+CTracer_handle_exception(CTracer *self, PyFrameObject *frame)
+{
+    /* Some code (Python 2.3, and pyexpat anywhere) fires an exception event
+        without a return event.  To detect that, we'll keep a copy of the
+        parent frame for an exception event.  If the next event is in that
+        frame, then we must have returned without a return event.  We can
+        synthesize the missing event then.
+
+        Python itself fixed this problem in 2.4.  Pyexpat still has the bug.
+        I've reported the problem with pyexpat as http://bugs.python.org/issue6359 .
+        If it gets fixed, this code should still work properly.  Maybe some day
+        the bug will be fixed everywhere coverage.py is supported, and we can
+        remove this missing-return detection.
+
+        More about this fix: https://nedbatchelder.com/blog/200907/a_nasty_little_bug.html
+    */
+    STATS( self->stats.exceptions++; )
+    self->last_exc_back = frame->f_back;
+    self->last_exc_firstlineno = MyFrame_GetCode(frame)->co_firstlineno;
+
+    return RET_OK;
+}
+
+/*
+ * The Trace Function
+ */
+static int
+CTracer_trace(CTracer *self, PyFrameObject *frame, int what, PyObject *arg_unused)
+{
+    int ret = RET_ERROR;
+
+    #if DO_NOTHING
+    return RET_OK;
+    #endif
+
+    if (!self->started) {
+        /* If CTracer.stop() has been called from another thread, the tracer
+           is still active in the current thread. Let's deactivate ourselves
+           now. */
+        PyEval_SetTrace(NULL, NULL);
+        return RET_OK;
+    }
+
+    #if WHAT_LOG || TRACE_LOG
+    PyObject * ascii = NULL;
+    #endif
+
+    #if WHAT_LOG
+    if (what <= (int)(sizeof(what_sym)/sizeof(const char *))) {
+        ascii = MyText_AS_BYTES(MyFrame_GetCode(frame)->co_filename);
+        printf("trace: %s @ %s %d\n", what_sym[what], MyBytes_AS_STRING(ascii), PyFrame_GetLineNumber(frame));
+        Py_DECREF(ascii);
+    }
+    #endif
+
+    #if TRACE_LOG
+    ascii = MyText_AS_BYTES(MyFrame_GetCode(frame)->co_filename);
+    if (strstr(MyBytes_AS_STRING(ascii), start_file) && PyFrame_GetLineNumber(frame) == start_line) {
+        logging = TRUE;
+    }
+    Py_DECREF(ascii);
+    #endif
+
+    /* See below for details on missing-return detection. */
+    if (CTracer_check_missing_return(self, frame) < 0) {
+        goto error;
+    }
+
+    self->activity = TRUE;
+
+    switch (what) {
+    case PyTrace_CALL:
+        if (CTracer_handle_call(self, frame) < 0) {
+            goto error;
+        }
+        break;
+
+    case PyTrace_RETURN:
+        if (CTracer_handle_return(self, frame) < 0) {
+            goto error;
+        }
+        break;
+
+    case PyTrace_LINE:
+        if (CTracer_handle_line(self, frame) < 0) {
+            goto error;
+        }
+        break;
+
+    case PyTrace_EXCEPTION:
+        if (CTracer_handle_exception(self, frame) < 0) {
+            goto error;
+        }
+        break;
+
+    default:
+        STATS( self->stats.others++; )
+        break;
+    }
+
+    ret = RET_OK;
+    goto cleanup;
+
+error:
+    STATS( self->stats.errors++; )
+
+cleanup:
+    return ret;
+}
+
+
+/*
+ * Python has two ways to set the trace function: sys.settrace(fn), which
+ * takes a Python callable, and PyEval_SetTrace(func, obj), which takes
+ * a C function and a Python object.  The way these work together is that
+ * sys.settrace(pyfn) calls PyEval_SetTrace(builtin_func, pyfn), using the
+ * Python callable as the object in PyEval_SetTrace.  So sys.gettrace()
+ * simply returns the Python object used as the second argument to
+ * PyEval_SetTrace.  So sys.gettrace() will return our self parameter, which
+ * means it must be callable to be used in sys.settrace().
+ *
+ * So we make ourself callable, equivalent to invoking our trace function.
+ *
+ * To help with the process of replaying stored frames, this function has an
+ * optional keyword argument:
+ *
+ *      def CTracer_call(frame, event, arg, lineno=0)
+ *
+ * If provided, the lineno argument is used as the line number, and the
+ * frame's f_lineno member is ignored.
+ */
+static PyObject *
+CTracer_call(CTracer *self, PyObject *args, PyObject *kwds)
+{
+    PyFrameObject *frame;
+    PyObject *what_str;
+    PyObject *arg;
+    int lineno = 0;
+    int what;
+    int orig_lineno;
+    PyObject *ret = NULL;
+    PyObject * ascii = NULL;
+
+    #if DO_NOTHING
+    CRASH
+    #endif
+
+    static char *what_names[] = {
+        "call", "exception", "line", "return",
+        "c_call", "c_exception", "c_return",
+        NULL
+        };
+
+    static char *kwlist[] = {"frame", "event", "arg", "lineno", NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!O!O|i:Tracer_call", kwlist,
+            &PyFrame_Type, &frame, &MyText_Type, &what_str, &arg, &lineno)) {
+        goto done;
+    }
+
+    /* In Python, the what argument is a string, we need to find an int
+       for the C function. */
+    for (what = 0; what_names[what]; what++) {
+        int should_break;
+        ascii = MyText_AS_BYTES(what_str);
+        should_break = !strcmp(MyBytes_AS_STRING(ascii), what_names[what]);
+        Py_DECREF(ascii);
+        if (should_break) {
+            break;
+        }
+    }
+
+    #if WHAT_LOG
+    ascii = MyText_AS_BYTES(MyFrame_GetCode(frame)->co_filename);
+    printf("pytrace: %s @ %s %d\n", what_sym[what], MyBytes_AS_STRING(ascii), PyFrame_GetLineNumber(frame));
+    Py_DECREF(ascii);
+    #endif
+
+    /* Save off the frame's lineno, and use the forced one, if provided. */
+    orig_lineno = frame->f_lineno;
+    if (lineno > 0) {
+        frame->f_lineno = lineno;
+    }
+
+    /* Invoke the C function, and return ourselves. */
+    if (CTracer_trace(self, frame, what, arg) == RET_OK) {
+        Py_INCREF(self);
+        ret = (PyObject *)self;
+    }
+
+    /* Clean up. */
+    frame->f_lineno = orig_lineno;
+
+    /* For better speed, install ourselves the C way so that future calls go
+       directly to CTracer_trace, without this intermediate function.
+
+       Only do this if this is a CALL event, since new trace functions only
+       take effect then.  If we don't condition it on CALL, then we'll clobber
+       the new trace function before it has a chance to get called.  To
+       understand why, there are three internal values to track: frame.f_trace,
+       c_tracefunc, and c_traceobj.  They are explained here:
+       https://nedbatchelder.com/text/trace-function.html
+
+       Without the conditional on PyTrace_CALL, this is what happens:
+
+            def func():                 #   f_trace         c_tracefunc     c_traceobj
+                                        #   --------------  --------------  --------------
+                                        #   CTracer         CTracer.trace   CTracer
+                sys.settrace(my_func)
+                                        #   CTracer         trampoline      my_func
+                        # Now Python calls trampoline(CTracer), which calls this function
+                        # which calls PyEval_SetTrace below, setting us as the tracer again:
+                                        #   CTracer         CTracer.trace   CTracer
+                        # and it's as if the settrace never happened.
+        */
+    if (what == PyTrace_CALL) {
+        PyEval_SetTrace((Py_tracefunc)CTracer_trace, (PyObject*)self);
+    }
+
+done:
+    return ret;
+}
+
+static PyObject *
+CTracer_start(CTracer *self, PyObject *args_unused)
+{
+    PyEval_SetTrace((Py_tracefunc)CTracer_trace, (PyObject*)self);
+    self->started = TRUE;
+    self->tracing_arcs = self->trace_arcs && PyObject_IsTrue(self->trace_arcs);
+
+    /* start() returns a trace function usable with sys.settrace() */
+    Py_INCREF(self);
+    return (PyObject *)self;
+}
+
+static PyObject *
+CTracer_stop(CTracer *self, PyObject *args_unused)
+{
+    if (self->started) {
+        /* Set the started flag only. The actual call to
+           PyEval_SetTrace(NULL, NULL) is delegated to the callback
+           itself to ensure that it called from the right thread.
+           */
+        self->started = FALSE;
+    }
+
+    Py_RETURN_NONE;
+}
+
+static PyObject *
+CTracer_activity(CTracer *self, PyObject *args_unused)
+{
+    if (self->activity) {
+        Py_RETURN_TRUE;
+    }
+    else {
+        Py_RETURN_FALSE;
+    }
+}
+
+static PyObject *
+CTracer_reset_activity(CTracer *self, PyObject *args_unused)
+{
+    self->activity = FALSE;
+    Py_RETURN_NONE;
+}
+
+static PyObject *
+CTracer_get_stats(CTracer *self, PyObject *args_unused)
+{
+#if COLLECT_STATS
+    return Py_BuildValue(
+        "{sI,sI,sI,sI,sI,sI,sI,sI,si,sI,sI,sI}",
+        "calls", self->stats.calls,
+        "lines", self->stats.lines,
+        "returns", self->stats.returns,
+        "exceptions", self->stats.exceptions,
+        "others", self->stats.others,
+        "files", self->stats.files,
+        "missed_returns", self->stats.missed_returns,
+        "stack_reallocs", self->stats.stack_reallocs,
+        "stack_alloc", self->pdata_stack->alloc,
+        "errors", self->stats.errors,
+        "pycalls", self->stats.pycalls,
+        "start_context_calls", self->stats.start_context_calls
+        );
+#else
+    Py_RETURN_NONE;
+#endif /* COLLECT_STATS */
+}
+
+static PyMemberDef
+CTracer_members[] = {
+    { "should_trace",       T_OBJECT, offsetof(CTracer, should_trace), 0,
+            PyDoc_STR("Function indicating whether to trace a file.") },
+
+    { "check_include",      T_OBJECT, offsetof(CTracer, check_include), 0,
+            PyDoc_STR("Function indicating whether to include a file.") },
+
+    { "warn",               T_OBJECT, offsetof(CTracer, warn), 0,
+            PyDoc_STR("Function for issuing warnings.") },
+
+    { "concur_id_func",     T_OBJECT, offsetof(CTracer, concur_id_func), 0,
+            PyDoc_STR("Function for determining concurrency context") },
+
+    { "data",               T_OBJECT, offsetof(CTracer, data), 0,
+            PyDoc_STR("The raw dictionary of trace data.") },
+
+    { "file_tracers",       T_OBJECT, offsetof(CTracer, file_tracers), 0,
+            PyDoc_STR("Mapping from file name to plugin name.") },
+
+    { "should_trace_cache", T_OBJECT, offsetof(CTracer, should_trace_cache), 0,
+            PyDoc_STR("Dictionary caching should_trace results.") },
+
+    { "trace_arcs",         T_OBJECT, offsetof(CTracer, trace_arcs), 0,
+            PyDoc_STR("Should we trace arcs, or just lines?") },
+
+    { "should_start_context", T_OBJECT, offsetof(CTracer, should_start_context), 0,
+            PyDoc_STR("Function for starting contexts.") },
+
+    { "switch_context",     T_OBJECT, offsetof(CTracer, switch_context), 0,
+            PyDoc_STR("Function for switching to a new context.") },
+
+    { "disable_plugin",     T_OBJECT, offsetof(CTracer, disable_plugin), 0,
+            PyDoc_STR("Function for disabling a plugin.") },
+
+    { NULL }
+};
+
+static PyMethodDef
+CTracer_methods[] = {
+    { "start",      (PyCFunction) CTracer_start,        METH_VARARGS,
+            PyDoc_STR("Start the tracer") },
+
+    { "stop",       (PyCFunction) CTracer_stop,         METH_VARARGS,
+            PyDoc_STR("Stop the tracer") },
+
+    { "get_stats",  (PyCFunction) CTracer_get_stats,    METH_VARARGS,
+            PyDoc_STR("Get statistics about the tracing") },
+
+    { "activity",   (PyCFunction) CTracer_activity,     METH_VARARGS,
+            PyDoc_STR("Has there been any activity?") },
+
+    { "reset_activity", (PyCFunction) CTracer_reset_activity, METH_VARARGS,
+            PyDoc_STR("Reset the activity flag") },
+
+    { NULL }
+};
+
+PyTypeObject
+CTracerType = {
+    MyType_HEAD_INIT
+    "coverage.CTracer",        /*tp_name*/
+    sizeof(CTracer),           /*tp_basicsize*/
+    0,                         /*tp_itemsize*/
+    (destructor)CTracer_dealloc, /*tp_dealloc*/
+    0,                         /*tp_print*/
+    0,                         /*tp_getattr*/
+    0,                         /*tp_setattr*/
+    0,                         /*tp_compare*/
+    0,                         /*tp_repr*/
+    0,                         /*tp_as_number*/
+    0,                         /*tp_as_sequence*/
+    0,                         /*tp_as_mapping*/
+    0,                         /*tp_hash */
+    (ternaryfunc)CTracer_call, /*tp_call*/
+    0,                         /*tp_str*/
+    0,                         /*tp_getattro*/
+    0,                         /*tp_setattro*/
+    0,                         /*tp_as_buffer*/
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
+    "CTracer objects",         /* tp_doc */
+    0,                         /* tp_traverse */
+    0,                         /* tp_clear */
+    0,                         /* tp_richcompare */
+    0,                         /* tp_weaklistoffset */
+    0,                         /* tp_iter */
+    0,                         /* tp_iternext */
+    CTracer_methods,           /* tp_methods */
+    CTracer_members,           /* tp_members */
+    0,                         /* tp_getset */
+    0,                         /* tp_base */
+    0,                         /* tp_dict */
+    0,                         /* tp_descr_get */
+    0,                         /* tp_descr_set */
+    0,                         /* tp_dictoffset */
+    (initproc)CTracer_init,    /* tp_init */
+    0,                         /* tp_alloc */
+    0,                         /* tp_new */
+};
diff --git a/contrib/python/coverage/py3/coverage/ctracer/tracer.h b/contrib/python/coverage/py3/coverage/ctracer/tracer.h
new file mode 100644
index 0000000000..8994a9e3d6
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/tracer.h
@@ -0,0 +1,75 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+#ifndef _COVERAGE_TRACER_H
+#define _COVERAGE_TRACER_H
+
+#include "util.h"
+#include "structmember.h"
+#include "frameobject.h"
+#include "opcode.h"
+
+#include "datastack.h"
+
+/* The CTracer type. */
+
+typedef struct CTracer {
+    PyObject_HEAD
+
+    /* Python objects manipulated directly by the Collector class. */
+    PyObject * should_trace;
+    PyObject * check_include;
+    PyObject * warn;
+    PyObject * concur_id_func;
+    PyObject * data;
+    PyObject * file_tracers;
+    PyObject * should_trace_cache;
+    PyObject * trace_arcs;
+    PyObject * should_start_context;
+    PyObject * switch_context;
+    PyObject * disable_plugin;
+
+    /* Has the tracer been started? */
+    BOOL started;
+    /* Are we tracing arcs, or just lines? */
+    BOOL tracing_arcs;
+    /* Have we had any activity? */
+    BOOL activity;
+    /* The current dynamic context. */
+    PyObject * context;
+
+    /*
+        The data stack is a stack of dictionaries.  Each dictionary collects
+        data for a single source file.  The data stack parallels the call stack:
+        each call pushes the new frame's file data onto the data stack, and each
+        return pops file data off.
+
+        The file data is a dictionary whose form depends on the tracing options.
+        If tracing arcs, the keys are line number pairs.  If not tracing arcs,
+        the keys are line numbers.  In both cases, the value is irrelevant
+        (None).
+    */
+
+    DataStack data_stack;           /* Used if we aren't doing concurrency. */
+
+    PyObject * data_stack_index;    /* Used if we are doing concurrency. */
+    DataStack * data_stacks;
+    int data_stacks_alloc;
+    int data_stacks_used;
+    DataStack * pdata_stack;
+
+    /* The current file's data stack entry. */
+    DataStackEntry * pcur_entry;
+
+    /* The parent frame for the last exception event, to fix missing returns. */
+    PyFrameObject * last_exc_back;
+    int last_exc_firstlineno;
+
+    Stats stats;
+} CTracer;
+
+int CTracer_intern_strings(void);
+
+extern PyTypeObject CTracerType;
+
+#endif /* _COVERAGE_TRACER_H */
diff --git a/contrib/python/coverage/py3/coverage/ctracer/util.h b/contrib/python/coverage/py3/coverage/ctracer/util.h
new file mode 100644
index 0000000000..973672db02
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/ctracer/util.h
@@ -0,0 +1,103 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+#ifndef _COVERAGE_UTIL_H
+#define _COVERAGE_UTIL_H
+
+#include <Python.h>
+
+/* Compile-time debugging helpers */
+#undef WHAT_LOG         /* Define to log the WHAT params in the trace function. */
+#undef TRACE_LOG        /* Define to log our bookkeeping. */
+#undef COLLECT_STATS    /* Collect counters: stats are printed when tracer is stopped. */
+#undef DO_NOTHING       /* Define this to make the tracer do nothing. */
+
+#if PY_VERSION_HEX >= 0x030B00A0
+// 3.11 moved f_lasti into an internal structure. This is totally the wrong way
+// to make this work, but it's all I've got until https://bugs.python.org/issue40421
+// is resolved.
+#include <internal/pycore_frame.h>
+#if PY_VERSION_HEX >= 0x030B00A7
+#define MyFrame_GetLasti(f)     (PyFrame_GetLasti(f))
+#else
+#define MyFrame_GetLasti(f)     ((f)->f_frame->f_lasti * 2)
+#endif
+#elif PY_VERSION_HEX >= 0x030A00A7
+// The f_lasti field changed meaning in 3.10.0a7. It had been bytes, but
+// now is instructions, so we need to adjust it to use it as a byte index.
+#define MyFrame_GetLasti(f)     ((f)->f_lasti * 2)
+#else
+#define MyFrame_GetLasti(f)     ((f)->f_lasti)
+#endif
+
+// Access f_code should be done through a helper starting in 3.9.
+#if PY_VERSION_HEX >= 0x03090000
+#define MyFrame_GetCode(f)      (PyFrame_GetCode(f))
+#else
+#define MyFrame_GetCode(f)      ((f)->f_code)
+#endif
+
+#if PY_VERSION_HEX >= 0x030B00B1
+#define MyCode_GetCode(co)      (PyCode_GetCode(co))
+#define MyCode_FreeCode(code)   Py_XDECREF(code)
+#elif PY_VERSION_HEX >= 0x030B00A7
+#define MyCode_GetCode(co)      (PyObject_GetAttrString((PyObject *)(co), "co_code"))
+#define MyCode_FreeCode(code)   Py_XDECREF(code)
+#else
+#define MyCode_GetCode(co)      ((co)->co_code)
+#define MyCode_FreeCode(code)
+#endif
+
+/* Py 2.x and 3.x compatibility */
+
+#if PY_MAJOR_VERSION >= 3
+
+#define MyText_Type                     PyUnicode_Type
+#define MyText_AS_BYTES(o)              PyUnicode_AsASCIIString(o)
+#define MyBytes_GET_SIZE(o)             PyBytes_GET_SIZE(o)
+#define MyBytes_AS_STRING(o)            PyBytes_AS_STRING(o)
+#define MyText_AsString(o)              PyUnicode_AsUTF8(o)
+#define MyText_FromFormat               PyUnicode_FromFormat
+#define MyInt_FromInt(i)                PyLong_FromLong((long)i)
+#define MyInt_AsInt(o)                  (int)PyLong_AsLong(o)
+#define MyText_InternFromString(s)      PyUnicode_InternFromString(s)
+
+#define MyType_HEAD_INIT                PyVarObject_HEAD_INIT(NULL, 0)
+
+#else
+
+#define MyText_Type                     PyString_Type
+#define MyText_AS_BYTES(o)              (Py_INCREF(o), o)
+#define MyBytes_GET_SIZE(o)             PyString_GET_SIZE(o)
+#define MyBytes_AS_STRING(o)            PyString_AS_STRING(o)
+#define MyText_AsString(o)              PyString_AsString(o)
+#define MyText_FromFormat               PyUnicode_FromFormat
+#define MyInt_FromInt(i)                PyInt_FromLong((long)i)
+#define MyInt_AsInt(o)                  (int)PyInt_AsLong(o)
+#define MyText_InternFromString(s)      PyString_InternFromString(s)
+
+#define MyType_HEAD_INIT                PyObject_HEAD_INIT(NULL)  0,
+
+#endif /* Py3k */
+
+// Undocumented, and not in all 2.7.x, so our own copy of it.
+#define My_XSETREF(op, op2)                     \
+    do {                                        \
+        PyObject *_py_tmp = (PyObject *)(op);   \
+        (op) = (op2);                           \
+        Py_XDECREF(_py_tmp);                    \
+    } while (0)
+
+/* The values returned to indicate ok or error. */
+#define RET_OK      0
+#define RET_ERROR   -1
+
+/* Nicer booleans */
+typedef int BOOL;
+#define FALSE   0
+#define TRUE    1
+
+/* Only for extreme machete-mode debugging! */
+#define CRASH       { printf("*** CRASH! ***\n"); *((int*)1) = 1; }
+
+#endif /* _COVERAGE_UTIL_H */
diff --git a/contrib/python/coverage/py3/coverage/data.py b/contrib/python/coverage/py3/coverage/data.py
new file mode 100644
index 0000000000..5dd1dfe3f0
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/data.py
@@ -0,0 +1,125 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Coverage data for coverage.py.
+
+This file had the 4.x JSON data support, which is now gone.  This file still
+has storage-agnostic helpers, and is kept to avoid changing too many imports.
+CoverageData is now defined in sqldata.py, and imported here to keep the
+imports working.
+
+"""
+
+import glob
+import os.path
+
+from coverage.misc import CoverageException, file_be_gone
+from coverage.sqldata import CoverageData
+
+
+def line_counts(data, fullpath=False):
+    """Return a dict summarizing the line coverage data.
+
+    Keys are based on the file names, and values are the number of executed
+    lines.  If `fullpath` is true, then the keys are the full pathnames of
+    the files, otherwise they are the basenames of the files.
+
+    Returns a dict mapping file names to counts of lines.
+
+    """
+    summ = {}
+    if fullpath:
+        filename_fn = lambda f: f
+    else:
+        filename_fn = os.path.basename
+    for filename in data.measured_files():
+        summ[filename_fn(filename)] = len(data.lines(filename))
+    return summ
+
+
+def add_data_to_hash(data, filename, hasher):
+    """Contribute `filename`'s data to the `hasher`.
+
+    `hasher` is a `coverage.misc.Hasher` instance to be updated with
+    the file's data.  It should only get the results data, not the run
+    data.
+
+    """
+    if data.has_arcs():
+        hasher.update(sorted(data.arcs(filename) or []))
+    else:
+        hasher.update(sorted(data.lines(filename) or []))
+    hasher.update(data.file_tracer(filename))
+
+
+def combine_parallel_data(data, aliases=None, data_paths=None, strict=False, keep=False):
+    """Combine a number of data files together.
+
+    Treat `data.filename` as a file prefix, and combine the data from all
+    of the data files starting with that prefix plus a dot.
+
+    If `aliases` is provided, it's a `PathAliases` object that is used to
+    re-map paths to match the local machine's.
+
+    If `data_paths` is provided, it is a list of directories or files to
+    combine.  Directories are searched for files that start with
+    `data.filename` plus dot as a prefix, and those files are combined.
+
+    If `data_paths` is not provided, then the directory portion of
+    `data.filename` is used as the directory to search for data files.
+
+    Unless `keep` is True every data file found and combined is then deleted from disk. If a file
+    cannot be read, a warning will be issued, and the file will not be
+    deleted.
+
+    If `strict` is true, and no files are found to combine, an error is
+    raised.
+
+    """
+    # Because of the os.path.abspath in the constructor, data_dir will
+    # never be an empty string.
+    data_dir, local = os.path.split(data.base_filename())
+    localdot = local + '.*'
+
+    data_paths = data_paths or [data_dir]
+    files_to_combine = []
+    for p in data_paths:
+        if os.path.isfile(p):
+            files_to_combine.append(os.path.abspath(p))
+        elif os.path.isdir(p):
+            pattern = os.path.join(os.path.abspath(p), localdot)
+            files_to_combine.extend(glob.glob(pattern))
+        else:
+            raise CoverageException("Couldn't combine from non-existent path '%s'" % (p,))
+
+    if strict and not files_to_combine:
+        raise CoverageException("No data to combine")
+
+    files_combined = 0
+    for f in files_to_combine:
+        if f == data.data_filename():
+            # Sometimes we are combining into a file which is one of the
+            # parallel files.  Skip that file.
+            if data._debug.should('dataio'):
+                data._debug.write("Skipping combining ourself: %r" % (f,))
+            continue
+        if data._debug.should('dataio'):
+            data._debug.write("Combining data file %r" % (f,))
+        try:
+            new_data = CoverageData(f, debug=data._debug)
+            new_data.read()
+        except CoverageException as exc:
+            if data._warn:
+                # The CoverageException has the file name in it, so just
+                # use the message as the warning.
+                data._warn(str(exc))
+        else:
+            data.update(new_data, aliases=aliases)
+            files_combined += 1
+            if not keep:
+                if data._debug.should('dataio'):
+                    data._debug.write("Deleting combined data file %r" % (f,))
+                file_be_gone(f)
+
+    if strict and not files_combined:
+        raise CoverageException("No usable data files")
diff --git a/contrib/python/coverage/py3/coverage/debug.py b/contrib/python/coverage/py3/coverage/debug.py
new file mode 100644
index 0000000000..194f16f50d
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/debug.py
@@ -0,0 +1,406 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Control of and utilities for debugging."""
+
+import contextlib
+import functools
+import inspect
+import itertools
+import os
+import pprint
+import sys
+try:
+    import _thread
+except ImportError:
+    import thread as _thread
+
+from coverage.backward import reprlib, StringIO
+from coverage.misc import isolate_module
+
+os = isolate_module(os)
+
+
+# When debugging, it can be helpful to force some options, especially when
+# debugging the configuration mechanisms you usually use to control debugging!
+# This is a list of forced debugging options.
+FORCED_DEBUG = []
+FORCED_DEBUG_FILE = None
+
+
+class DebugControl(object):
+    """Control and output for debugging."""
+
+    show_repr_attr = False      # For SimpleReprMixin
+
+    def __init__(self, options, output):
+        """Configure the options and output file for debugging."""
+        self.options = list(options) + FORCED_DEBUG
+        self.suppress_callers = False
+
+        filters = []
+        if self.should('pid'):
+            filters.append(add_pid_and_tid)
+        self.output = DebugOutputFile.get_one(
+            output,
+            show_process=self.should('process'),
+            filters=filters,
+        )
+        self.raw_output = self.output.outfile
+
+    def __repr__(self):
+        return "<DebugControl options=%r raw_output=%r>" % (self.options, self.raw_output)
+
+    def should(self, option):
+        """Decide whether to output debug information in category `option`."""
+        if option == "callers" and self.suppress_callers:
+            return False
+        return (option in self.options)
+
+    @contextlib.contextmanager
+    def without_callers(self):
+        """A context manager to prevent call stacks from being logged."""
+        old = self.suppress_callers
+        self.suppress_callers = True
+        try:
+            yield
+        finally:
+            self.suppress_callers = old
+
+    def write(self, msg):
+        """Write a line of debug output.
+
+        `msg` is the line to write. A newline will be appended.
+
+        """
+        self.output.write(msg+"\n")
+        if self.should('self'):
+            caller_self = inspect.stack()[1][0].f_locals.get('self')
+            if caller_self is not None:
+                self.output.write("self: {!r}\n".format(caller_self))
+        if self.should('callers'):
+            dump_stack_frames(out=self.output, skip=1)
+        self.output.flush()
+
+
+class DebugControlString(DebugControl):
+    """A `DebugControl` that writes to a StringIO, for testing."""
+    def __init__(self, options):
+        super(DebugControlString, self).__init__(options, StringIO())
+
+    def get_output(self):
+        """Get the output text from the `DebugControl`."""
+        return self.raw_output.getvalue()
+
+
+class NoDebugging(object):
+    """A replacement for DebugControl that will never try to do anything."""
+    def should(self, option):               # pylint: disable=unused-argument
+        """Should we write debug messages?  Never."""
+        return False
+
+
+def info_header(label):
+    """Make a nice header string."""
+    return "--{:-<60s}".format(" "+label+" ")
+
+
+def info_formatter(info):
+    """Produce a sequence of formatted lines from info.
+
+    `info` is a sequence of pairs (label, data).  The produced lines are
+    nicely formatted, ready to print.
+
+    """
+    info = list(info)
+    if not info:
+        return
+    label_len = 30
+    assert all(len(l) < label_len for l, _ in info)
+    for label, data in info:
+        if data == []:
+            data = "-none-"
+        if isinstance(data, (list, set, tuple)):
+            prefix = "%*s:" % (label_len, label)
+            for e in data:
+                yield "%*s %s" % (label_len+1, prefix, e)
+                prefix = ""
+        else:
+            yield "%*s: %s" % (label_len, label, data)
+
+
+def write_formatted_info(writer, header, info):
+    """Write a sequence of (label,data) pairs nicely."""
+    writer.write(info_header(header))
+    for line in info_formatter(info):
+        writer.write(" %s" % line)
+
+
+def short_stack(limit=None, skip=0):
+    """Return a string summarizing the call stack.
+
+    The string is multi-line, with one line per stack frame. Each line shows
+    the function name, the file name, and the line number:
+
+        ...
+        start_import_stop : /Users/ned/coverage/trunk/tests/coveragetest.py @95
+        import_local_file : /Users/ned/coverage/trunk/tests/coveragetest.py @81
+        import_local_file : /Users/ned/coverage/trunk/coverage/backward.py @159
+        ...
+
+    `limit` is the number of frames to include, defaulting to all of them.
+
+    `skip` is the number of frames to skip, so that debugging functions can
+    call this and not be included in the result.
+
+    """
+    stack = inspect.stack()[limit:skip:-1]
+    return "\n".join("%30s : %s:%d" % (t[3], t[1], t[2]) for t in stack)
+
+
+def dump_stack_frames(limit=None, out=None, skip=0):
+    """Print a summary of the stack to stdout, or someplace else."""
+    out = out or sys.stdout
+    out.write(short_stack(limit=limit, skip=skip+1))
+    out.write("\n")
+
+
+def clipped_repr(text, numchars=50):
+    """`repr(text)`, but limited to `numchars`."""
+    r = reprlib.Repr()
+    r.maxstring = numchars
+    return r.repr(text)
+
+
+def short_id(id64):
+    """Given a 64-bit id, make a shorter 16-bit one."""
+    id16 = 0
+    for offset in range(0, 64, 16):
+        id16 ^= id64 >> offset
+    return id16 & 0xFFFF
+
+
+def add_pid_and_tid(text):
+    """A filter to add pid and tid to debug messages."""
+    # Thread ids are useful, but too long. Make a shorter one.
+    tid = "{:04x}".format(short_id(_thread.get_ident()))
+    text = "{:5d}.{}: {}".format(os.getpid(), tid, text)
+    return text
+
+
+class SimpleReprMixin(object):
+    """A mixin implementing a simple __repr__."""
+    simple_repr_ignore = ['simple_repr_ignore', '$coverage.object_id']
+
+    def __repr__(self):
+        show_attrs = (
+            (k, v) for k, v in self.__dict__.items()
+            if getattr(v, "show_repr_attr", True)
+            and not callable(v)
+            and k not in self.simple_repr_ignore
+        )
+        return "<{klass} @0x{id:x} {attrs}>".format(
+            klass=self.__class__.__name__,
+            id=id(self),
+            attrs=" ".join("{}={!r}".format(k, v) for k, v in show_attrs),
+            )
+
+
+def simplify(v):                                            # pragma: debugging
+    """Turn things which are nearly dict/list/etc into dict/list/etc."""
+    if isinstance(v, dict):
+        return {k:simplify(vv) for k, vv in v.items()}
+    elif isinstance(v, (list, tuple)):
+        return type(v)(simplify(vv) for vv in v)
+    elif hasattr(v, "__dict__"):
+        return simplify({'.'+k: v for k, v in v.__dict__.items()})
+    else:
+        return v
+
+
+def pp(v):                                                  # pragma: debugging
+    """Debug helper to pretty-print data, including SimpleNamespace objects."""
+    # Might not be needed in 3.9+
+    pprint.pprint(simplify(v))
+
+
+def filter_text(text, filters):
+    """Run `text` through a series of filters.
+
+    `filters` is a list of functions. Each takes a string and returns a
+    string.  Each is run in turn.
+
+    Returns: the final string that results after all of the filters have
+    run.
+
+    """
+    clean_text = text.rstrip()
+    ending = text[len(clean_text):]
+    text = clean_text
+    for fn in filters:
+        lines = []
+        for line in text.splitlines():
+            lines.extend(fn(line).splitlines())
+        text = "\n".join(lines)
+    return text + ending
+
+
+class CwdTracker(object):                                   # pragma: debugging
+    """A class to add cwd info to debug messages."""
+    def __init__(self):
+        self.cwd = None
+
+    def filter(self, text):
+        """Add a cwd message for each new cwd."""
+        cwd = os.getcwd()
+        if cwd != self.cwd:
+            text = "cwd is now {!r}\n".format(cwd) + text
+            self.cwd = cwd
+        return text
+
+
+class DebugOutputFile(object):                              # pragma: debugging
+    """A file-like object that includes pid and cwd information."""
+    def __init__(self, outfile, show_process, filters):
+        self.outfile = outfile
+        self.show_process = show_process
+        self.filters = list(filters)
+
+        if self.show_process:
+            self.filters.insert(0, CwdTracker().filter)
+            self.write("New process: executable: %r\n" % (sys.executable,))
+            self.write("New process: cmd: %r\n" % (getattr(sys, 'argv', None),))
+            if hasattr(os, 'getppid'):
+                self.write("New process: pid: %r, parent pid: %r\n" % (os.getpid(), os.getppid()))
+
+    SYS_MOD_NAME = '$coverage.debug.DebugOutputFile.the_one'
+
+    @classmethod
+    def get_one(cls, fileobj=None, show_process=True, filters=(), interim=False):
+        """Get a DebugOutputFile.
+
+        If `fileobj` is provided, then a new DebugOutputFile is made with it.
+
+        If `fileobj` isn't provided, then a file is chosen
+        (COVERAGE_DEBUG_FILE, or stderr), and a process-wide singleton
+        DebugOutputFile is made.
+
+        `show_process` controls whether the debug file adds process-level
+        information, and filters is a list of other message filters to apply.
+
+        `filters` are the text filters to apply to the stream to annotate with
+        pids, etc.
+
+        If `interim` is true, then a future `get_one` can replace this one.
+
+        """
+        if fileobj is not None:
+            # Make DebugOutputFile around the fileobj passed.
+            return cls(fileobj, show_process, filters)
+
+        # Because of the way igor.py deletes and re-imports modules,
+        # this class can be defined more than once. But we really want
+        # a process-wide singleton. So stash it in sys.modules instead of
+        # on a class attribute. Yes, this is aggressively gross.
+        the_one, is_interim = sys.modules.get(cls.SYS_MOD_NAME, (None, True))
+        if the_one is None or is_interim:
+            if fileobj is None:
+                debug_file_name = os.environ.get("COVERAGE_DEBUG_FILE", FORCED_DEBUG_FILE)
+                if debug_file_name:
+                    fileobj = open(debug_file_name, "a")
+                else:
+                    fileobj = sys.stderr
+            the_one = cls(fileobj, show_process, filters)
+            sys.modules[cls.SYS_MOD_NAME] = (the_one, interim)
+        return the_one
+
+    def write(self, text):
+        """Just like file.write, but filter through all our filters."""
+        self.outfile.write(filter_text(text, self.filters))
+        self.outfile.flush()
+
+    def flush(self):
+        """Flush our file."""
+        self.outfile.flush()
+
+
+def log(msg, stack=False):                                  # pragma: debugging
+    """Write a log message as forcefully as possible."""
+    out = DebugOutputFile.get_one(interim=True)
+    out.write(msg+"\n")
+    if stack:
+        dump_stack_frames(out=out, skip=1)
+
+
+def decorate_methods(decorator, butnot=(), private=False):  # pragma: debugging
+    """A class decorator to apply a decorator to methods."""
+    def _decorator(cls):
+        for name, meth in inspect.getmembers(cls, inspect.isroutine):
+            if name not in cls.__dict__:
+                continue
+            if name != "__init__":
+                if not private and name.startswith("_"):
+                    continue
+            if name in butnot:
+                continue
+            setattr(cls, name, decorator(meth))
+        return cls
+    return _decorator
+
+
+def break_in_pudb(func):                                    # pragma: debugging
+    """A function decorator to stop in the debugger for each call."""
+    @functools.wraps(func)
+    def _wrapper(*args, **kwargs):
+        import pudb
+        sys.stdout = sys.__stdout__
+        pudb.set_trace()
+        return func(*args, **kwargs)
+    return _wrapper
+
+
+OBJ_IDS = itertools.count()
+CALLS = itertools.count()
+OBJ_ID_ATTR = "$coverage.object_id"
+
+def show_calls(show_args=True, show_stack=False, show_return=False):    # pragma: debugging
+    """A method decorator to debug-log each call to the function."""
+    def _decorator(func):
+        @functools.wraps(func)
+        def _wrapper(self, *args, **kwargs):
+            oid = getattr(self, OBJ_ID_ATTR, None)
+            if oid is None:
+                oid = "{:08d} {:04d}".format(os.getpid(), next(OBJ_IDS))
+                setattr(self, OBJ_ID_ATTR, oid)
+            extra = ""
+            if show_args:
+                eargs = ", ".join(map(repr, args))
+                ekwargs = ", ".join("{}={!r}".format(*item) for item in kwargs.items())
+                extra += "("
+                extra += eargs
+                if eargs and ekwargs:
+                    extra += ", "
+                extra += ekwargs
+                extra += ")"
+            if show_stack:
+                extra += " @ "
+                extra += "; ".join(_clean_stack_line(l) for l in short_stack().splitlines())
+            callid = next(CALLS)
+            msg = "{} {:04d} {}{}\n".format(oid, callid, func.__name__, extra)
+            DebugOutputFile.get_one(interim=True).write(msg)
+            ret = func(self, *args, **kwargs)
+            if show_return:
+                msg = "{} {:04d} {} return {!r}\n".format(oid, callid, func.__name__, ret)
+                DebugOutputFile.get_one(interim=True).write(msg)
+            return ret
+        return _wrapper
+    return _decorator
+
+
+def _clean_stack_line(s):                                   # pragma: debugging
+    """Simplify some paths in a stack trace, for compactness."""
+    s = s.strip()
+    s = s.replace(os.path.dirname(__file__) + '/', '')
+    s = s.replace(os.path.dirname(os.__file__) + '/', '')
+    s = s.replace(sys.prefix + '/', '')
+    return s
diff --git a/contrib/python/coverage/py3/coverage/disposition.py b/contrib/python/coverage/py3/coverage/disposition.py
new file mode 100644
index 0000000000..9b9a997d8a
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/disposition.py
@@ -0,0 +1,37 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Simple value objects for tracking what to do with files."""
+
+
+class FileDisposition(object):
+    """A simple value type for recording what to do with a file."""
+    pass
+
+
+# FileDisposition "methods": FileDisposition is a pure value object, so it can
+# be implemented in either C or Python.  Acting on them is done with these
+# functions.
+
+def disposition_init(cls, original_filename):
+    """Construct and initialize a new FileDisposition object."""
+    disp = cls()
+    disp.original_filename = original_filename
+    disp.canonical_filename = original_filename
+    disp.source_filename = None
+    disp.trace = False
+    disp.reason = ""
+    disp.file_tracer = None
+    disp.has_dynamic_filename = False
+    return disp
+
+
+def disposition_debug_msg(disp):
+    """Make a nice debug message of what the FileDisposition is doing."""
+    if disp.trace:
+        msg = "Tracing %r" % (disp.original_filename,)
+        if disp.file_tracer:
+            msg += ": will be traced by %r" % disp.file_tracer
+    else:
+        msg = "Not tracing %r: %s" % (disp.original_filename, disp.reason)
+    return msg
diff --git a/contrib/python/coverage/py3/coverage/env.py b/contrib/python/coverage/py3/coverage/env.py
new file mode 100644
index 0000000000..ea78a5be89
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/env.py
@@ -0,0 +1,130 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Determine facts about the environment."""
+
+import os
+import platform
+import sys
+
+# Operating systems.
+WINDOWS = sys.platform == "win32"
+LINUX = sys.platform.startswith("linux")
+
+# Python implementations.
+CPYTHON = (platform.python_implementation() == "CPython")
+PYPY = (platform.python_implementation() == "PyPy")
+JYTHON = (platform.python_implementation() == "Jython")
+IRONPYTHON = (platform.python_implementation() == "IronPython")
+
+# Python versions. We amend version_info with one more value, a zero if an
+# official version, or 1 if built from source beyond an official version.
+PYVERSION = sys.version_info + (int(platform.python_version()[-1] == "+"),)
+PY2 = PYVERSION < (3, 0)
+PY3 = PYVERSION >= (3, 0)
+
+if PYPY:
+    PYPYVERSION = sys.pypy_version_info
+
+PYPY2 = PYPY and PY2
+PYPY3 = PYPY and PY3
+
+# Python behavior.
+class PYBEHAVIOR(object):
+    """Flags indicating this Python's behavior."""
+
+    pep626 = CPYTHON and (PYVERSION > (3, 10, 0, 'alpha', 4))
+
+    # Is "if __debug__" optimized away?
+    if PYPY3:
+        optimize_if_debug = True
+    elif PYPY2:
+        optimize_if_debug = False
+    else:
+        optimize_if_debug = not pep626
+
+    # Is "if not __debug__" optimized away?
+    optimize_if_not_debug = (not PYPY) and (PYVERSION >= (3, 7, 0, 'alpha', 4))
+    if pep626:
+        optimize_if_not_debug = False
+    if PYPY3:
+        optimize_if_not_debug = True
+
+    # Is "if not __debug__" optimized away even better?
+    optimize_if_not_debug2 = (not PYPY) and (PYVERSION >= (3, 8, 0, 'beta', 1))
+    if pep626:
+        optimize_if_not_debug2 = False
+
+    # Do we have yield-from?
+    yield_from = (PYVERSION >= (3, 3))
+
+    # Do we have PEP 420 namespace packages?
+    namespaces_pep420 = (PYVERSION >= (3, 3))
+
+    # Do .pyc files have the source file size recorded in them?
+    size_in_pyc = (PYVERSION >= (3, 3))
+
+    # Do we have async and await syntax?
+    async_syntax = (PYVERSION >= (3, 5))
+
+    # PEP 448 defined additional unpacking generalizations
+    unpackings_pep448 = (PYVERSION >= (3, 5))
+
+    # Can co_lnotab have negative deltas?
+    negative_lnotab = (PYVERSION >= (3, 6)) and not (PYPY and PYPYVERSION < (7, 2))
+
+    # Do .pyc files conform to PEP 552? Hash-based pyc's.
+    hashed_pyc_pep552 = (PYVERSION >= (3, 7, 0, 'alpha', 4))
+
+    # Python 3.7.0b3 changed the behavior of the sys.path[0] entry for -m. It
+    # used to be an empty string (meaning the current directory). It changed
+    # to be the actual path to the current directory, so that os.chdir wouldn't
+    # affect the outcome.
+    actual_syspath0_dash_m = CPYTHON and (PYVERSION >= (3, 7, 0, 'beta', 3))
+
+    # 3.7 changed how functions with only docstrings are numbered.
+    docstring_only_function = (not PYPY) and ((3, 7, 0, 'beta', 5) <= PYVERSION <= (3, 10))
+
+    # When a break/continue/return statement in a try block jumps to a finally
+    # block, does the finally block do the break/continue/return (pre-3.8), or
+    # does the finally jump back to the break/continue/return (3.8) to do the
+    # work?
+    finally_jumps_back = ((3, 8) <= PYVERSION < (3, 10))
+
+    # When a function is decorated, does the trace function get called for the
+    # @-line and also the def-line (new behavior in 3.8)? Or just the @-line
+    # (old behavior)?
+    trace_decorated_def = (PYVERSION >= (3, 8))
+
+    # Are while-true loops optimized into absolute jumps with no loop setup?
+    nix_while_true = (PYVERSION >= (3, 8))
+
+    # Python 3.9a1 made sys.argv[0] and other reported files absolute paths.
+    report_absolute_files = (PYVERSION >= (3, 9))
+
+    # Lines after break/continue/return/raise are no longer compiled into the
+    # bytecode.  They used to be marked as missing, now they aren't executable.
+    omit_after_jump = pep626
+
+    # PyPy has always omitted statements after return.
+    omit_after_return = omit_after_jump or PYPY
+
+    # Modules used to have firstlineno equal to the line number of the first
+    # real line of code.  Now they always start at 1.
+    module_firstline_1 = pep626
+
+    # Are "if 0:" lines (and similar) kept in the compiled code?
+    keep_constant_test = pep626
+
+# Coverage.py specifics.
+
+# Are we using the C-implemented trace function?
+C_TRACER = os.getenv('COVERAGE_TEST_TRACER', 'c') == 'c'
+
+# Are we coverage-measuring ourselves?
+METACOV = os.getenv('COVERAGE_COVERAGE', '') != ''
+
+# Are we running our test suite?
+# Even when running tests, you can use COVERAGE_TESTING=0 to disable the
+# test-specific behavior like contracts.
+TESTING = os.getenv('COVERAGE_TESTING', '') == 'True'
diff --git a/contrib/python/coverage/py3/coverage/execfile.py b/contrib/python/coverage/py3/coverage/execfile.py
new file mode 100644
index 0000000000..29409d517a
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/execfile.py
@@ -0,0 +1,362 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Execute files of Python code."""
+
+import inspect
+import marshal
+import os
+import struct
+import sys
+import types
+
+from coverage import env
+from coverage.backward import BUILTINS
+from coverage.backward import PYC_MAGIC_NUMBER, imp, importlib_util_find_spec
+from coverage.files import canonical_filename, python_reported_file
+from coverage.misc import CoverageException, ExceptionDuringRun, NoCode, NoSource, isolate_module
+from coverage.phystokens import compile_unicode
+from coverage.python import get_python_source
+
+os = isolate_module(os)
+
+
+class DummyLoader(object):
+    """A shim for the pep302 __loader__, emulating pkgutil.ImpLoader.
+
+    Currently only implements the .fullname attribute
+    """
+    def __init__(self, fullname, *_args):
+        self.fullname = fullname
+
+
+if importlib_util_find_spec:
+    def find_module(modulename):
+        """Find the module named `modulename`.
+
+        Returns the file path of the module, the name of the enclosing
+        package, and the spec.
+        """
+        try:
+            spec = importlib_util_find_spec(modulename)
+        except ImportError as err:
+            raise NoSource(str(err))
+        if not spec:
+            raise NoSource("No module named %r" % (modulename,))
+        pathname = spec.origin
+        packagename = spec.name
+        if spec.submodule_search_locations:
+            mod_main = modulename + ".__main__"
+            spec = importlib_util_find_spec(mod_main)
+            if not spec:
+                raise NoSource(
+                    "No module named %s; "
+                    "%r is a package and cannot be directly executed"
+                    % (mod_main, modulename)
+                )
+            pathname = spec.origin
+            packagename = spec.name
+        packagename = packagename.rpartition(".")[0]
+        return pathname, packagename, spec
+else:
+    def find_module(modulename):
+        """Find the module named `modulename`.
+
+        Returns the file path of the module, the name of the enclosing
+        package, and None (where a spec would have been).
+        """
+        openfile = None
+        glo, loc = globals(), locals()
+        try:
+            # Search for the module - inside its parent package, if any - using
+            # standard import mechanics.
+            if '.' in modulename:
+                packagename, name = modulename.rsplit('.', 1)
+                package = __import__(packagename, glo, loc, ['__path__'])
+                searchpath = package.__path__
+            else:
+                packagename, name = None, modulename
+                searchpath = None  # "top-level search" in imp.find_module()
+            openfile, pathname, _ = imp.find_module(name, searchpath)
+
+            # Complain if this is a magic non-file module.
+            if openfile is None and pathname is None:
+                raise NoSource(
+                    "module does not live in a file: %r" % modulename
+                    )
+
+            # If `modulename` is actually a package, not a mere module, then we
+            # pretend to be Python 2.7 and try running its __main__.py script.
+            if openfile is None:
+                packagename = modulename
+                name = '__main__'
+                package = __import__(packagename, glo, loc, ['__path__'])
+                searchpath = package.__path__
+                openfile, pathname, _ = imp.find_module(name, searchpath)
+        except ImportError as err:
+            raise NoSource(str(err))
+        finally:
+            if openfile:
+                openfile.close()
+
+        return pathname, packagename, None
+
+
+class PyRunner(object):
+    """Multi-stage execution of Python code.
+
+    This is meant to emulate real Python execution as closely as possible.
+
+    """
+    def __init__(self, args, as_module=False):
+        self.args = args
+        self.as_module = as_module
+
+        self.arg0 = args[0]
+        self.package = self.modulename = self.pathname = self.loader = self.spec = None
+
+    def prepare(self):
+        """Set sys.path properly.
+
+        This needs to happen before any importing, and without importing anything.
+        """
+        if self.as_module:
+            if env.PYBEHAVIOR.actual_syspath0_dash_m:
+                path0 = os.getcwd()
+            else:
+                path0 = ""
+        elif os.path.isdir(self.arg0):
+            # Running a directory means running the __main__.py file in that
+            # directory.
+            path0 = self.arg0
+        else:
+            path0 = os.path.abspath(os.path.dirname(self.arg0))
+
+        if os.path.isdir(sys.path[0]):
+            # sys.path fakery.  If we are being run as a command, then sys.path[0]
+            # is the directory of the "coverage" script.  If this is so, replace
+            # sys.path[0] with the directory of the file we're running, or the
+            # current directory when running modules.  If it isn't so, then we
+            # don't know what's going on, and just leave it alone.
+            top_file = inspect.stack()[-1][0].f_code.co_filename
+            sys_path_0_abs = os.path.abspath(sys.path[0])
+            top_file_dir_abs = os.path.abspath(os.path.dirname(top_file))
+            sys_path_0_abs = canonical_filename(sys_path_0_abs)
+            top_file_dir_abs = canonical_filename(top_file_dir_abs)
+            if sys_path_0_abs != top_file_dir_abs:
+                path0 = None
+
+        else:
+            # sys.path[0] is a file. Is the next entry the directory containing
+            # that file?
+            if sys.path[1] == os.path.dirname(sys.path[0]):
+                # Can it be right to always remove that?
+                del sys.path[1]
+
+        if path0 is not None:
+            sys.path[0] = python_reported_file(path0)
+
+    def _prepare2(self):
+        """Do more preparation to run Python code.
+
+        Includes finding the module to run and adjusting sys.argv[0].
+        This method is allowed to import code.
+
+        """
+        if self.as_module:
+            self.modulename = self.arg0
+            pathname, self.package, self.spec = find_module(self.modulename)
+            if self.spec is not None:
+                self.modulename = self.spec.name
+            self.loader = DummyLoader(self.modulename)
+            self.pathname = os.path.abspath(pathname)
+            self.args[0] = self.arg0 = self.pathname
+        elif os.path.isdir(self.arg0):
+            # Running a directory means running the __main__.py file in that
+            # directory.
+            for ext in [".py", ".pyc", ".pyo"]:
+                try_filename = os.path.join(self.arg0, "__main__" + ext)
+                if os.path.exists(try_filename):
+                    self.arg0 = try_filename
+                    break
+            else:
+                raise NoSource("Can't find '__main__' module in '%s'" % self.arg0)
+
+            if env.PY2:
+                self.arg0 = os.path.abspath(self.arg0)
+
+            # Make a spec. I don't know if this is the right way to do it.
+            try:
+                import importlib.machinery
+            except ImportError:
+                pass
+            else:
+                try_filename = python_reported_file(try_filename)
+                self.spec = importlib.machinery.ModuleSpec("__main__", None, origin=try_filename)
+                self.spec.has_location = True
+            self.package = ""
+            self.loader = DummyLoader("__main__")
+        else:
+            if env.PY3:
+                self.loader = DummyLoader("__main__")
+
+        self.arg0 = python_reported_file(self.arg0)
+
+    def run(self):
+        """Run the Python code!"""
+
+        self._prepare2()
+
+        # Create a module to serve as __main__
+        main_mod = types.ModuleType('__main__')
+
+        from_pyc = self.arg0.endswith((".pyc", ".pyo"))
+        main_mod.__file__ = self.arg0
+        if from_pyc:
+            main_mod.__file__ = main_mod.__file__[:-1]
+        if self.package is not None:
+            main_mod.__package__ = self.package
+        main_mod.__loader__ = self.loader
+        if self.spec is not None:
+            main_mod.__spec__ = self.spec
+
+        main_mod.__builtins__ = BUILTINS
+
+        sys.modules['__main__'] = main_mod
+
+        # Set sys.argv properly.
+        sys.argv = self.args
+
+        try:
+            # Make a code object somehow.
+            if from_pyc:
+                code = make_code_from_pyc(self.arg0)
+            else:
+                code = make_code_from_py(self.arg0)
+        except CoverageException:
+            raise
+        except Exception as exc:
+            msg = "Couldn't run '{filename}' as Python code: {exc.__class__.__name__}: {exc}"
+            raise CoverageException(msg.format(filename=self.arg0, exc=exc))
+
+        # Execute the code object.
+        # Return to the original directory in case the test code exits in
+        # a non-existent directory.
+        cwd = os.getcwd()
+        try:
+            exec(code, main_mod.__dict__)
+        except SystemExit:                          # pylint: disable=try-except-raise
+            # The user called sys.exit().  Just pass it along to the upper
+            # layers, where it will be handled.
+            raise
+        except Exception:
+            # Something went wrong while executing the user code.
+            # Get the exc_info, and pack them into an exception that we can
+            # throw up to the outer loop.  We peel one layer off the traceback
+            # so that the coverage.py code doesn't appear in the final printed
+            # traceback.
+            typ, err, tb = sys.exc_info()
+
+            # PyPy3 weirdness.  If I don't access __context__, then somehow it
+            # is non-None when the exception is reported at the upper layer,
+            # and a nested exception is shown to the user.  This getattr fixes
+            # it somehow? https://bitbucket.org/pypy/pypy/issue/1903
+            getattr(err, '__context__', None)
+
+            # Call the excepthook.
+            try:
+                if hasattr(err, "__traceback__"):
+                    err.__traceback__ = err.__traceback__.tb_next
+                sys.excepthook(typ, err, tb.tb_next)
+            except SystemExit:                      # pylint: disable=try-except-raise
+                raise
+            except Exception:
+                # Getting the output right in the case of excepthook
+                # shenanigans is kind of involved.
+                sys.stderr.write("Error in sys.excepthook:\n")
+                typ2, err2, tb2 = sys.exc_info()
+                err2.__suppress_context__ = True
+                if hasattr(err2, "__traceback__"):
+                    err2.__traceback__ = err2.__traceback__.tb_next
+                sys.__excepthook__(typ2, err2, tb2.tb_next)
+                sys.stderr.write("\nOriginal exception was:\n")
+                raise ExceptionDuringRun(typ, err, tb.tb_next)
+            else:
+                sys.exit(1)
+        finally:
+            os.chdir(cwd)
+
+
+def run_python_module(args):
+    """Run a Python module, as though with ``python -m name args...``.
+
+    `args` is the argument array to present as sys.argv, including the first
+    element naming the module being executed.
+
+    This is a helper for tests, to encapsulate how to use PyRunner.
+
+    """
+    runner = PyRunner(args, as_module=True)
+    runner.prepare()
+    runner.run()
+
+
+def run_python_file(args):
+    """Run a Python file as if it were the main program on the command line.
+
+    `args` is the argument array to present as sys.argv, including the first
+    element naming the file being executed.  `package` is the name of the
+    enclosing package, if any.
+
+    This is a helper for tests, to encapsulate how to use PyRunner.
+
+    """
+    runner = PyRunner(args, as_module=False)
+    runner.prepare()
+    runner.run()
+
+
+def make_code_from_py(filename):
+    """Get source from `filename` and make a code object of it."""
+    # Open the source file.
+    try:
+        source = get_python_source(filename)
+    except (IOError, NoSource):
+        raise NoSource("No file to run: '%s'" % filename)
+
+    code = compile_unicode(source, filename, "exec")
+    return code
+
+
+def make_code_from_pyc(filename):
+    """Get a code object from a .pyc file."""
+    try:
+        fpyc = open(filename, "rb")
+    except IOError:
+        raise NoCode("No file to run: '%s'" % filename)
+
+    with fpyc:
+        # First four bytes are a version-specific magic number.  It has to
+        # match or we won't run the file.
+        magic = fpyc.read(4)
+        if magic != PYC_MAGIC_NUMBER:
+            raise NoCode("Bad magic number in .pyc file: {} != {}".format(magic, PYC_MAGIC_NUMBER))
+
+        date_based = True
+        if env.PYBEHAVIOR.hashed_pyc_pep552:
+            flags = struct.unpack('<L', fpyc.read(4))[0]
+            hash_based = flags & 0x01
+            if hash_based:
+                fpyc.read(8)    # Skip the hash.
+                date_based = False
+        if date_based:
+            # Skip the junk in the header that we don't need.
+            fpyc.read(4)            # Skip the moddate.
+            if env.PYBEHAVIOR.size_in_pyc:
+                # 3.3 added another long to the header (size), skip it.
+                fpyc.read(4)
+
+        # The rest of the file is the code object we want.
+        code = marshal.load(fpyc)
+
+    return code
diff --git a/contrib/python/coverage/py3/coverage/files.py b/contrib/python/coverage/py3/coverage/files.py
new file mode 100644
index 0000000000..5133ad07f3
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/files.py
@@ -0,0 +1,441 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""File wrangling."""
+
+import hashlib
+import fnmatch
+import ntpath
+import os
+import os.path
+import posixpath
+import re
+import sys
+
+from coverage import env
+from coverage.backward import unicode_class
+from coverage.misc import contract, CoverageException, join_regex, isolate_module
+
+
+os = isolate_module(os)
+
+
+def set_relative_directory():
+    """Set the directory that `relative_filename` will be relative to."""
+    global RELATIVE_DIR, CANONICAL_FILENAME_CACHE
+
+    # The absolute path to our current directory.
+    RELATIVE_DIR = os.path.normcase(abs_file(os.curdir) + os.sep)
+
+    # Cache of results of calling the canonical_filename() method, to
+    # avoid duplicating work.
+    CANONICAL_FILENAME_CACHE = {}
+
+
+def relative_directory():
+    """Return the directory that `relative_filename` is relative to."""
+    return RELATIVE_DIR
+
+
+@contract(returns='unicode')
+def relative_filename(filename):
+    """Return the relative form of `filename`.
+
+    The file name will be relative to the current directory when the
+    `set_relative_directory` was called.
+
+    """
+    fnorm = os.path.normcase(filename)
+    if fnorm.startswith(RELATIVE_DIR):
+        filename = filename[len(RELATIVE_DIR):]
+    return unicode_filename(filename)
+
+
+@contract(returns='unicode')
+def canonical_filename(filename):
+    """Return a canonical file name for `filename`.
+
+    An absolute path with no redundant components and normalized case.
+
+    """
+    if filename not in CANONICAL_FILENAME_CACHE:
+        cf = filename
+        if not os.path.isabs(filename):
+            for path in [os.curdir] + sys.path:
+                if path is None:
+                    continue
+                f = os.path.join(path, filename)
+                try:
+                    exists = os.path.exists(f)
+                except UnicodeError:
+                    exists = False
+                if exists:
+                    cf = f
+                    break
+        cf = abs_file(cf)
+        CANONICAL_FILENAME_CACHE[filename] = cf
+    return CANONICAL_FILENAME_CACHE[filename]
+
+if getattr(sys, 'is_standalone_binary', False):
+    # filename for py files in binary is already canonical,
+    # it's relative to the arcadia root
+    def canonical_filename(filename):
+        # next assert does not needed in case when we load coverage from not arcadia source in arcadia binary
+        # assert not filename.startswith("/"), filename
+        return filename
+
+MAX_FLAT = 200
+
+@contract(filename='unicode', returns='unicode')
+def flat_rootname(filename):
+    """A base for a flat file name to correspond to this file.
+
+    Useful for writing files about the code where you want all the files in
+    the same directory, but need to differentiate same-named files from
+    different directories.
+
+    For example, the file a/b/c.py will return 'a_b_c_py'
+
+    """
+    name = ntpath.splitdrive(filename)[1]
+    name = re.sub(r"[\\/.:]", "_", name)
+    if len(name) > MAX_FLAT:
+        h = hashlib.sha1(name.encode('UTF-8')).hexdigest()
+        name = name[-(MAX_FLAT-len(h)-1):] + '_' + h
+    return name
+
+
+if env.WINDOWS:
+
+    _ACTUAL_PATH_CACHE = {}
+    _ACTUAL_PATH_LIST_CACHE = {}
+
+    def actual_path(path):
+        """Get the actual path of `path`, including the correct case."""
+        if env.PY2 and isinstance(path, unicode_class):
+            path = path.encode(sys.getfilesystemencoding())
+        if path in _ACTUAL_PATH_CACHE:
+            return _ACTUAL_PATH_CACHE[path]
+
+        head, tail = os.path.split(path)
+        if not tail:
+            # This means head is the drive spec: normalize it.
+            actpath = head.upper()
+        elif not head:
+            actpath = tail
+        else:
+            head = actual_path(head)
+            if head in _ACTUAL_PATH_LIST_CACHE:
+                files = _ACTUAL_PATH_LIST_CACHE[head]
+            else:
+                try:
+                    files = os.listdir(head)
+                except Exception:
+                    # This will raise OSError, or this bizarre TypeError:
+                    # https://bugs.python.org/issue1776160
+                    files = []
+                _ACTUAL_PATH_LIST_CACHE[head] = files
+            normtail = os.path.normcase(tail)
+            for f in files:
+                if os.path.normcase(f) == normtail:
+                    tail = f
+                    break
+            actpath = os.path.join(head, tail)
+        _ACTUAL_PATH_CACHE[path] = actpath
+        return actpath
+
+else:
+    def actual_path(filename):
+        """The actual path for non-Windows platforms."""
+        return filename
+
+
+if env.PY2:
+    @contract(returns='unicode')
+    def unicode_filename(filename):
+        """Return a Unicode version of `filename`."""
+        if isinstance(filename, str):
+            encoding = sys.getfilesystemencoding() or sys.getdefaultencoding()
+            filename = filename.decode(encoding, "replace")
+        return filename
+else:
+    @contract(filename='unicode', returns='unicode')
+    def unicode_filename(filename):
+        """Return a Unicode version of `filename`."""
+        return filename
+
+
+@contract(returns='unicode')
+def abs_file(path):
+    """Return the absolute normalized form of `path`."""
+    try:
+        path = os.path.realpath(path)
+    except UnicodeError:
+        pass
+    path = os.path.abspath(path)
+    path = actual_path(path)
+    path = unicode_filename(path)
+    return path
+
+
+def python_reported_file(filename):
+    """Return the string as Python would describe this file name."""
+    if env.PYBEHAVIOR.report_absolute_files:
+        filename = os.path.abspath(filename)
+    return filename
+
+
+RELATIVE_DIR = None
+CANONICAL_FILENAME_CACHE = None
+set_relative_directory()
+
+
+def isabs_anywhere(filename):
+    """Is `filename` an absolute path on any OS?"""
+    return ntpath.isabs(filename) or posixpath.isabs(filename)
+
+
+def prep_patterns(patterns):
+    """Prepare the file patterns for use in a `FnmatchMatcher`.
+
+    If a pattern starts with a wildcard, it is used as a pattern
+    as-is.  If it does not start with a wildcard, then it is made
+    absolute with the current directory.
+
+    If `patterns` is None, an empty list is returned.
+
+    """
+    prepped = []
+    for p in patterns or []:
+        if p.startswith(("*", "?")):
+            prepped.append(p)
+        else:
+            prepped.append(abs_file(p))
+    return prepped
+
+
+class TreeMatcher(object):
+    """A matcher for files in a tree.
+
+    Construct with a list of paths, either files or directories. Paths match
+    with the `match` method if they are one of the files, or if they are
+    somewhere in a subtree rooted at one of the directories.
+
+    """
+    def __init__(self, paths):
+        self.paths = list(paths)
+
+    def __repr__(self):
+        return "<TreeMatcher %r>" % self.paths
+
+    def info(self):
+        """A list of strings for displaying when dumping state."""
+        return self.paths
+
+    def match(self, fpath):
+        """Does `fpath` indicate a file in one of our trees?"""
+        for p in self.paths:
+            if fpath.startswith(p):
+                if fpath == p:
+                    # This is the same file!
+                    return True
+                if fpath[len(p)] == os.sep:
+                    # This is a file in the directory
+                    return True
+        return False
+
+
+class ModuleMatcher(object):
+    """A matcher for modules in a tree."""
+    def __init__(self, module_names):
+        self.modules = list(module_names)
+
+    def __repr__(self):
+        return "<ModuleMatcher %r>" % (self.modules)
+
+    def info(self):
+        """A list of strings for displaying when dumping state."""
+        return self.modules
+
+    def match(self, module_name):
+        """Does `module_name` indicate a module in one of our packages?"""
+        if not module_name:
+            return False
+
+        for m in self.modules:
+            if module_name.startswith(m):
+                if module_name == m:
+                    return True
+                if module_name[len(m)] == '.':
+                    # This is a module in the package
+                    return True
+
+        return False
+
+
+class FnmatchMatcher(object):
+    """A matcher for files by file name pattern."""
+    def __init__(self, pats):
+        self.pats = list(pats)
+        self.re = fnmatches_to_regex(self.pats, case_insensitive=env.WINDOWS)
+
+    def __repr__(self):
+        return "<FnmatchMatcher %r>" % self.pats
+
+    def info(self):
+        """A list of strings for displaying when dumping state."""
+        return self.pats
+
+    def match(self, fpath):
+        """Does `fpath` match one of our file name patterns?"""
+        return self.re.match(fpath) is not None
+
+
+def sep(s):
+    """Find the path separator used in this string, or os.sep if none."""
+    sep_match = re.search(r"[\\/]", s)
+    if sep_match:
+        the_sep = sep_match.group(0)
+    else:
+        the_sep = os.sep
+    return the_sep
+
+
+def fnmatches_to_regex(patterns, case_insensitive=False, partial=False):
+    """Convert fnmatch patterns to a compiled regex that matches any of them.
+
+    Slashes are always converted to match either slash or backslash, for
+    Windows support, even when running elsewhere.
+
+    If `partial` is true, then the pattern will match if the target string
+    starts with the pattern. Otherwise, it must match the entire string.
+
+    Returns: a compiled regex object.  Use the .match method to compare target
+    strings.
+
+    """
+    regexes = (fnmatch.translate(pattern) for pattern in patterns)
+    # Python3.7 fnmatch translates "/" as "/". Before that, it translates as "\/",
+    # so we have to deal with maybe a backslash.
+    regexes = (re.sub(r"\\?/", r"[\\\\/]", regex) for regex in regexes)
+
+    if partial:
+        # fnmatch always adds a \Z to match the whole string, which we don't
+        # want, so we remove the \Z.  While removing it, we only replace \Z if
+        # followed by paren (introducing flags), or at end, to keep from
+        # destroying a literal \Z in the pattern.
+        regexes = (re.sub(r'\\Z(\(\?|$)', r'\1', regex) for regex in regexes)
+
+    flags = 0
+    if case_insensitive:
+        flags |= re.IGNORECASE
+    compiled = re.compile(join_regex(regexes), flags=flags)
+
+    return compiled
+
+
+class PathAliases(object):
+    """A collection of aliases for paths.
+
+    When combining data files from remote machines, often the paths to source
+    code are different, for example, due to OS differences, or because of
+    serialized checkouts on continuous integration machines.
+
+    A `PathAliases` object tracks a list of pattern/result pairs, and can
+    map a path through those aliases to produce a unified path.
+
+    """
+    def __init__(self):
+        self.aliases = []
+
+    def pprint(self):       # pragma: debugging
+        """Dump the important parts of the PathAliases, for debugging."""
+        for regex, result in self.aliases:
+            print("{!r} --> {!r}".format(regex.pattern, result))
+
+    def add(self, pattern, result):
+        """Add the `pattern`/`result` pair to the list of aliases.
+
+        `pattern` is an `fnmatch`-style pattern.  `result` is a simple
+        string.  When mapping paths, if a path starts with a match against
+        `pattern`, then that match is replaced with `result`.  This models
+        isomorphic source trees being rooted at different places on two
+        different machines.
+
+        `pattern` can't end with a wildcard component, since that would
+        match an entire tree, and not just its root.
+
+        """
+        pattern_sep = sep(pattern)
+
+        if len(pattern) > 1:
+            pattern = pattern.rstrip(r"\/")
+
+        # The pattern can't end with a wildcard component.
+        if pattern.endswith("*"):
+            raise CoverageException("Pattern must not end with wildcards.")
+
+        # The pattern is meant to match a filepath.  Let's make it absolute
+        # unless it already is, or is meant to match any prefix.
+        if not pattern.startswith('*') and not isabs_anywhere(pattern +
+                                                              pattern_sep):
+            pattern = abs_file(pattern)
+        if not pattern.endswith(pattern_sep):
+            pattern += pattern_sep
+
+        # Make a regex from the pattern.
+        regex = fnmatches_to_regex([pattern], case_insensitive=True, partial=True)
+
+        # Normalize the result: it must end with a path separator.
+        result_sep = sep(result)
+        result = result.rstrip(r"\/") + result_sep
+        self.aliases.append((regex, result))
+
+    def map(self, path):
+        """Map `path` through the aliases.
+
+        `path` is checked against all of the patterns.  The first pattern to
+        match is used to replace the root of the path with the result root.
+        Only one pattern is ever used.  If no patterns match, `path` is
+        returned unchanged.
+
+        The separator style in the result is made to match that of the result
+        in the alias.
+
+        Returns the mapped path.  If a mapping has happened, this is a
+        canonical path.  If no mapping has happened, it is the original value
+        of `path` unchanged.
+
+        """
+        for regex, result in self.aliases:
+            m = regex.match(path)
+            if m:
+                new = path.replace(m.group(0), result)
+                new = new.replace(sep(path), sep(result))
+                new = canonical_filename(new)
+                return new
+        return path
+
+
+def find_python_files(dirname):
+    """Yield all of the importable Python files in `dirname`, recursively.
+
+    To be importable, the files have to be in a directory with a __init__.py,
+    except for `dirname` itself, which isn't required to have one.  The
+    assumption is that `dirname` was specified directly, so the user knows
+    best, but sub-directories are checked for a __init__.py to be sure we only
+    find the importable files.
+
+    """
+    for i, (dirpath, dirnames, filenames) in enumerate(os.walk(dirname)):
+        if i > 0 and '__init__.py' not in filenames:
+            # If a directory doesn't have __init__.py, then it isn't
+            # importable and neither are its files
+            del dirnames[:]
+            continue
+        for filename in filenames:
+            # We're only interested in files that look like reasonable Python
+            # files: Must end with .py or .pyw, and must not have certain funny
+            # characters that probably mean they are editor junk.
+            if re.match(r"^[^.#~!$@%^&*()+=,]+\.pyw?$", filename):
+                yield os.path.join(dirpath, filename)
diff --git a/contrib/python/coverage/py3/coverage/fullcoverage/encodings.py b/contrib/python/coverage/py3/coverage/fullcoverage/encodings.py
new file mode 100644
index 0000000000..aeb416e406
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/fullcoverage/encodings.py
@@ -0,0 +1,60 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Imposter encodings module that installs a coverage-style tracer.
+
+This is NOT the encodings module; it is an imposter that sets up tracing
+instrumentation and then replaces itself with the real encodings module.
+
+If the directory that holds this file is placed first in the PYTHONPATH when
+using "coverage" to run Python's tests, then this file will become the very
+first module imported by the internals of Python 3.  It installs a
+coverage.py-compatible trace function that can watch Standard Library modules
+execute from the very earliest stages of Python's own boot process.  This fixes
+a problem with coverage.py - that it starts too late to trace the coverage of
+many of the most fundamental modules in the Standard Library.
+
+"""
+
+import sys
+
+class FullCoverageTracer(object):
+    def __init__(self):
+        # `traces` is a list of trace events.  Frames are tricky: the same
+        # frame object is used for a whole scope, with new line numbers
+        # written into it.  So in one scope, all the frame objects are the
+        # same object, and will eventually all will point to the last line
+        # executed.  So we keep the line numbers alongside the frames.
+        # The list looks like:
+        #
+        #   traces = [
+        #       ((frame, event, arg), lineno), ...
+        #       ]
+        #
+        self.traces = []
+
+    def fullcoverage_trace(self, *args):
+        frame, event, arg = args
+        self.traces.append((args, frame.f_lineno))
+        return self.fullcoverage_trace
+
+sys.settrace(FullCoverageTracer().fullcoverage_trace)
+
+# In coverage/files.py is actual_filename(), which uses glob.glob.  I don't
+# understand why, but that use of glob borks everything if fullcoverage is in
+# effect.  So here we make an ugly hail-mary pass to switch off glob.glob over
+# there.  This means when using fullcoverage, Windows path names will not be
+# their actual case.
+
+#sys.fullcoverage = True
+
+# Finally, remove our own directory from sys.path; remove ourselves from
+# sys.modules; and re-import "encodings", which will be the real package
+# this time.  Note that the delete from sys.modules dictionary has to
+# happen last, since all of the symbols in this module will become None
+# at that exact moment, including "sys".
+
+parentdir = max(filter(__file__.startswith, sys.path), key=len)
+sys.path.remove(parentdir)
+del sys.modules['encodings']
+import encodings
diff --git a/contrib/python/coverage/py3/coverage/html.py b/contrib/python/coverage/py3/coverage/html.py
new file mode 100644
index 0000000000..9d8e342716
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/html.py
@@ -0,0 +1,539 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""HTML reporting for coverage.py."""
+
+import datetime
+import json
+import os
+import re
+import shutil
+import sys
+
+import coverage
+from coverage import env
+from coverage.backward import iitems, SimpleNamespace, format_local_datetime
+from coverage.data import add_data_to_hash
+from coverage.files import flat_rootname
+from coverage.misc import CoverageException, ensure_dir, file_be_gone, Hasher, isolate_module
+from coverage.report import get_analysis_to_report
+from coverage.results import Numbers
+from coverage.templite import Templite
+
+os = isolate_module(os)
+
+
+# Static files are looked for in a list of places.
+STATIC_PATH = [
+    # The place Debian puts system Javascript libraries.
+    "/usr/share/javascript",
+
+    # Our htmlfiles directory.
+    os.path.join(os.path.dirname(__file__), "htmlfiles"),
+]
+
+
+def data_filename(fname, pkgdir=""):
+    """Return the path to a data file of ours.
+
+    The file is searched for on `STATIC_PATH`, and the first place it's found,
+    is returned.
+
+    Each directory in `STATIC_PATH` is searched as-is, and also, if `pkgdir`
+    is provided, at that sub-directory.
+
+    """
+    tried = []
+    for static_dir in STATIC_PATH:
+        static_filename = os.path.join(static_dir, fname)
+        if os.path.exists(static_filename):
+            return static_filename
+        else:
+            tried.append(static_filename)
+        if pkgdir:
+            static_filename = os.path.join(static_dir, pkgdir, fname)
+            if os.path.exists(static_filename):
+                return static_filename
+            else:
+                tried.append(static_filename)
+    raise CoverageException(
+        "Couldn't find static file %r from %r, tried: %r" % (fname, os.getcwd(), tried)
+    )
+
+
+def get_htmlfiles_resource(name):
+    import pkgutil
+    return pkgutil.get_data(__package__, 'htmlfiles/' + name)
+
+
+def read_data(fname):
+    """Return the contents of a data file of ours."""
+    if getattr(sys, 'is_standalone_binary', False):
+        res_buf = get_htmlfiles_resource(fname).decode()
+        if res_buf is not None:
+            return res_buf
+
+    with open(data_filename(fname)) as data_file:
+        return data_file.read()
+
+
+def write_html(fname, html):
+    """Write `html` to `fname`, properly encoded."""
+    html = re.sub(r"(\A\s+)|(\s+$)", "", html, flags=re.MULTILINE) + "\n"
+    with open(fname, "wb") as fout:
+        fout.write(html.encode('ascii', 'xmlcharrefreplace'))
+
+
+class HtmlDataGeneration(object):
+    """Generate structured data to be turned into HTML reports."""
+
+    EMPTY = "(empty)"
+
+    def __init__(self, cov):
+        self.coverage = cov
+        self.config = self.coverage.config
+        data = self.coverage.get_data()
+        self.has_arcs = data.has_arcs()
+        if self.config.show_contexts:
+            if data.measured_contexts() == {""}:
+                self.coverage._warn("No contexts were measured")
+        data.set_query_contexts(self.config.report_contexts)
+
+    def data_for_file(self, fr, analysis):
+        """Produce the data needed for one file's report."""
+        if self.has_arcs:
+            missing_branch_arcs = analysis.missing_branch_arcs()
+            arcs_executed = analysis.arcs_executed()
+
+        if self.config.show_contexts:
+            contexts_by_lineno = analysis.data.contexts_by_lineno(analysis.filename)
+
+        lines = []
+
+        for lineno, tokens in enumerate(fr.source_token_lines(), start=1):
+            # Figure out how to mark this line.
+            category = None
+            short_annotations = []
+            long_annotations = []
+
+            if lineno in analysis.excluded:
+                category = 'exc'
+            elif lineno in analysis.missing:
+                category = 'mis'
+            elif self.has_arcs and lineno in missing_branch_arcs:
+                category = 'par'
+                for b in missing_branch_arcs[lineno]:
+                    if b < 0:
+                        short_annotations.append("exit")
+                    else:
+                        short_annotations.append(b)
+                    long_annotations.append(fr.missing_arc_description(lineno, b, arcs_executed))
+            elif lineno in analysis.statements:
+                category = 'run'
+
+            contexts = contexts_label = None
+            context_list = None
+            if category and self.config.show_contexts:
+                contexts = sorted(c or self.EMPTY for c in contexts_by_lineno[lineno])
+                if contexts == [self.EMPTY]:
+                    contexts_label = self.EMPTY
+                else:
+                    contexts_label = "{} ctx".format(len(contexts))
+                    context_list = contexts
+
+            lines.append(SimpleNamespace(
+                tokens=tokens,
+                number=lineno,
+                category=category,
+                statement=(lineno in analysis.statements),
+                contexts=contexts,
+                contexts_label=contexts_label,
+                context_list=context_list,
+                short_annotations=short_annotations,
+                long_annotations=long_annotations,
+            ))
+
+        file_data = SimpleNamespace(
+            relative_filename=fr.relative_filename(),
+            nums=analysis.numbers,
+            lines=lines,
+        )
+
+        return file_data
+
+
+class HtmlReporter(object):
+    """HTML reporting."""
+
+    # These files will be copied from the htmlfiles directory to the output
+    # directory.
+    STATIC_FILES = [
+        ("style.css", ""),
+        ("jquery.min.js", "jquery"),
+        ("jquery.ba-throttle-debounce.min.js", "jquery-throttle-debounce"),
+        ("jquery.hotkeys.js", "jquery-hotkeys"),
+        ("jquery.isonscreen.js", "jquery-isonscreen"),
+        ("jquery.tablesorter.min.js", "jquery-tablesorter"),
+        ("coverage_html.js", ""),
+        ("keybd_closed.png", ""),
+        ("keybd_open.png", ""),
+        ("favicon_32.png", ""),
+    ]
+
+    def __init__(self, cov):
+        self.coverage = cov
+        self.config = self.coverage.config
+        self.directory = self.config.html_dir
+
+        self.skip_covered = self.config.html_skip_covered
+        if self.skip_covered is None:
+            self.skip_covered = self.config.skip_covered
+        self.skip_empty = self.config.html_skip_empty
+        if self.skip_empty is None:
+            self.skip_empty= self.config.skip_empty
+
+        title = self.config.html_title
+        if env.PY2:
+            title = title.decode("utf8")
+
+        if self.config.extra_css:
+            self.extra_css = os.path.basename(self.config.extra_css)
+        else:
+            self.extra_css = None
+
+        self.data = self.coverage.get_data()
+        self.has_arcs = self.data.has_arcs()
+
+        self.file_summaries = []
+        self.all_files_nums = []
+        self.incr = IncrementalChecker(self.directory)
+        self.datagen = HtmlDataGeneration(self.coverage)
+        self.totals = Numbers()
+
+        self.template_globals = {
+            # Functions available in the templates.
+            'escape': escape,
+            'pair': pair,
+            'len': len,
+
+            # Constants for this report.
+            '__url__': coverage.__url__,
+            '__version__': coverage.__version__,
+            'title': title,
+            'time_stamp': format_local_datetime(datetime.datetime.now()),
+            'extra_css': self.extra_css,
+            'has_arcs': self.has_arcs,
+            'show_contexts': self.config.show_contexts,
+
+            # Constants for all reports.
+            # These css classes determine which lines are highlighted by default.
+            'category': {
+                'exc': 'exc show_exc',
+                'mis': 'mis show_mis',
+                'par': 'par run show_par',
+                'run': 'run',
+            }
+        }
+        self.pyfile_html_source = read_data("pyfile.html")
+        self.source_tmpl = Templite(self.pyfile_html_source, self.template_globals)
+
+    def report(self, morfs):
+        """Generate an HTML report for `morfs`.
+
+        `morfs` is a list of modules or file names.
+
+        """
+        # Read the status data and check that this run used the same
+        # global data as the last run.
+        self.incr.read()
+        self.incr.check_global_data(self.config, self.pyfile_html_source)
+
+        # Process all the files.
+        for fr, analysis in get_analysis_to_report(self.coverage, morfs):
+            self.html_file(fr, analysis)
+
+        if not self.all_files_nums:
+            raise CoverageException("No data to report.")
+
+        self.totals = sum(self.all_files_nums)
+
+        # Write the index file.
+        self.index_file()
+
+        self.make_local_static_report_files()
+        return self.totals.n_statements and self.totals.pc_covered
+
+    def make_local_static_report_files(self):
+        """Make local instances of static files for HTML report."""
+        # The files we provide must always be copied.
+        for static, pkgdir in self.STATIC_FILES:
+            if getattr(sys, 'is_standalone_binary', False):
+                data = get_htmlfiles_resource(static)
+                if data is None:
+                    raise IOError("No such resource: " + static)
+
+                with open(os.path.join(self.directory, static), "wb") as afile:
+                    afile.write(data)
+            else:
+                shutil.copyfile(
+                    data_filename(static, pkgdir),
+                    os.path.join(self.directory, static)
+                )
+
+        # The user may have extra CSS they want copied.
+        if self.extra_css:
+            shutil.copyfile(
+                self.config.extra_css,
+                os.path.join(self.directory, self.extra_css)
+            )
+
+    def html_file(self, fr, analysis):
+        """Generate an HTML file for one source file."""
+        rootname = flat_rootname(fr.relative_filename())
+        html_filename = rootname + ".html"
+        ensure_dir(self.directory)
+        html_path = os.path.join(self.directory, html_filename)
+
+        # Get the numbers for this file.
+        nums = analysis.numbers
+        self.all_files_nums.append(nums)
+
+        if self.skip_covered:
+            # Don't report on 100% files.
+            no_missing_lines = (nums.n_missing == 0)
+            no_missing_branches = (nums.n_partial_branches == 0)
+            if no_missing_lines and no_missing_branches:
+                # If there's an existing file, remove it.
+                file_be_gone(html_path)
+                return
+
+        if self.skip_empty:
+            # Don't report on empty files.
+            if nums.n_statements == 0:
+                file_be_gone(html_path)
+                return
+
+        # Find out if the file on disk is already correct.
+        if self.incr.can_skip_file(self.data, fr, rootname):
+            self.file_summaries.append(self.incr.index_info(rootname))
+            return
+
+        # Write the HTML page for this file.
+        file_data = self.datagen.data_for_file(fr, analysis)
+        for ldata in file_data.lines:
+            # Build the HTML for the line.
+            html = []
+            for tok_type, tok_text in ldata.tokens:
+                if tok_type == "ws":
+                    html.append(escape(tok_text))
+                else:
+                    tok_html = escape(tok_text) or '&nbsp;'
+                    html.append(
+                        u'<span class="{}">{}</span>'.format(tok_type, tok_html)
+                    )
+            ldata.html = ''.join(html)
+
+            if ldata.short_annotations:
+                # 202F is NARROW NO-BREAK SPACE.
+                # 219B is RIGHTWARDS ARROW WITH STROKE.
+                ldata.annotate = u",&nbsp;&nbsp; ".join(
+                    u"{}&#x202F;&#x219B;&#x202F;{}".format(ldata.number, d)
+                    for d in ldata.short_annotations
+                    )
+            else:
+                ldata.annotate = None
+
+            if ldata.long_annotations:
+                longs = ldata.long_annotations
+                if len(longs) == 1:
+                    ldata.annotate_long = longs[0]
+                else:
+                    ldata.annotate_long = u"{:d} missed branches: {}".format(
+                        len(longs),
+                        u", ".join(
+                            u"{:d}) {}".format(num, ann_long)
+                            for num, ann_long in enumerate(longs, start=1)
+                            ),
+                    )
+            else:
+                ldata.annotate_long = None
+
+            css_classes = []
+            if ldata.category:
+                css_classes.append(self.template_globals['category'][ldata.category])
+            ldata.css_class = ' '.join(css_classes) or "pln"
+
+        html = self.source_tmpl.render(file_data.__dict__)
+        write_html(html_path, html)
+
+        # Save this file's information for the index file.
+        index_info = {
+            'nums': nums,
+            'html_filename': html_filename,
+            'relative_filename': fr.relative_filename(),
+        }
+        self.file_summaries.append(index_info)
+        self.incr.set_index_info(rootname, index_info)
+
+    def index_file(self):
+        """Write the index.html file for this report."""
+        index_tmpl = Templite(read_data("index.html"), self.template_globals)
+
+        html = index_tmpl.render({
+            'files': self.file_summaries,
+            'totals': self.totals,
+        })
+
+        write_html(os.path.join(self.directory, "index.html"), html)
+
+        # Write the latest hashes for next time.
+        self.incr.write()
+
+
+class IncrementalChecker(object):
+    """Logic and data to support incremental reporting."""
+
+    STATUS_FILE = "status.json"
+    STATUS_FORMAT = 2
+
+    #           pylint: disable=wrong-spelling-in-comment,useless-suppression
+    #  The data looks like:
+    #
+    #  {
+    #      "format": 2,
+    #      "globals": "540ee119c15d52a68a53fe6f0897346d",
+    #      "version": "4.0a1",
+    #      "files": {
+    #          "cogapp___init__": {
+    #              "hash": "e45581a5b48f879f301c0f30bf77a50c",
+    #              "index": {
+    #                  "html_filename": "cogapp___init__.html",
+    #                  "relative_filename": "cogapp/__init__",
+    #                  "nums": [ 1, 14, 0, 0, 0, 0, 0 ]
+    #              }
+    #          },
+    #          ...
+    #          "cogapp_whiteutils": {
+    #              "hash": "8504bb427fc488c4176809ded0277d51",
+    #              "index": {
+    #                  "html_filename": "cogapp_whiteutils.html",
+    #                  "relative_filename": "cogapp/whiteutils",
+    #                  "nums": [ 1, 59, 0, 1, 28, 2, 2 ]
+    #              }
+    #          }
+    #      }
+    #  }
+
+    def __init__(self, directory):
+        self.directory = directory
+        self.reset()
+
+    def reset(self):
+        """Initialize to empty. Causes all files to be reported."""
+        self.globals = ''
+        self.files = {}
+
+    def read(self):
+        """Read the information we stored last time."""
+        usable = False
+        try:
+            status_file = os.path.join(self.directory, self.STATUS_FILE)
+            with open(status_file) as fstatus:
+                status = json.load(fstatus)
+        except (IOError, ValueError):
+            usable = False
+        else:
+            usable = True
+            if status['format'] != self.STATUS_FORMAT:
+                usable = False
+            elif status['version'] != coverage.__version__:
+                usable = False
+
+        if usable:
+            self.files = {}
+            for filename, fileinfo in iitems(status['files']):
+                fileinfo['index']['nums'] = Numbers(*fileinfo['index']['nums'])
+                self.files[filename] = fileinfo
+            self.globals = status['globals']
+        else:
+            self.reset()
+
+    def write(self):
+        """Write the current status."""
+        status_file = os.path.join(self.directory, self.STATUS_FILE)
+        files = {}
+        for filename, fileinfo in iitems(self.files):
+            fileinfo['index']['nums'] = fileinfo['index']['nums'].init_args()
+            files[filename] = fileinfo
+
+        status = {
+            'format': self.STATUS_FORMAT,
+            'version': coverage.__version__,
+            'globals': self.globals,
+            'files': files,
+        }
+        with open(status_file, "w") as fout:
+            json.dump(status, fout, separators=(',', ':'))
+
+    def check_global_data(self, *data):
+        """Check the global data that can affect incremental reporting."""
+        m = Hasher()
+        for d in data:
+            m.update(d)
+        these_globals = m.hexdigest()
+        if self.globals != these_globals:
+            self.reset()
+            self.globals = these_globals
+
+    def can_skip_file(self, data, fr, rootname):
+        """Can we skip reporting this file?
+
+        `data` is a CoverageData object, `fr` is a `FileReporter`, and
+        `rootname` is the name being used for the file.
+        """
+        m = Hasher()
+        m.update(fr.source().encode('utf-8'))
+        add_data_to_hash(data, fr.filename, m)
+        this_hash = m.hexdigest()
+
+        that_hash = self.file_hash(rootname)
+
+        if this_hash == that_hash:
+            # Nothing has changed to require the file to be reported again.
+            return True
+        else:
+            self.set_file_hash(rootname, this_hash)
+            return False
+
+    def file_hash(self, fname):
+        """Get the hash of `fname`'s contents."""
+        return self.files.get(fname, {}).get('hash', '')
+
+    def set_file_hash(self, fname, val):
+        """Set the hash of `fname`'s contents."""
+        self.files.setdefault(fname, {})['hash'] = val
+
+    def index_info(self, fname):
+        """Get the information for index.html for `fname`."""
+        return self.files.get(fname, {}).get('index', {})
+
+    def set_index_info(self, fname, info):
+        """Set the information for index.html for `fname`."""
+        self.files.setdefault(fname, {})['index'] = info
+
+
+# Helpers for templates and generating HTML
+
+def escape(t):
+    """HTML-escape the text in `t`.
+
+    This is only suitable for HTML text, not attributes.
+
+    """
+    # Convert HTML special chars into HTML entities.
+    return t.replace("&", "&amp;").replace("<", "&lt;")
+
+
+def pair(ratio):
+    """Format a pair of numbers so JavaScript can read them in an attribute."""
+    return "%s %s" % ratio
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/coverage_html.js b/contrib/python/coverage/py3/coverage/htmlfiles/coverage_html.js
new file mode 100644
index 0000000000..27b49b36f9
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/coverage_html.js
@@ -0,0 +1,616 @@
+// Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+// For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+// Coverage.py HTML report browser code.
+/*jslint browser: true, sloppy: true, vars: true, plusplus: true, maxerr: 50, indent: 4 */
+/*global coverage: true, document, window, $ */
+
+coverage = {};
+
+// Find all the elements with shortkey_* class, and use them to assign a shortcut key.
+coverage.assign_shortkeys = function () {
+    $("*[class*='shortkey_']").each(function (i, e) {
+        $.each($(e).attr("class").split(" "), function (i, c) {
+            if (/^shortkey_/.test(c)) {
+                $(document).bind('keydown', c.substr(9), function () {
+                    $(e).click();
+                });
+            }
+        });
+    });
+};
+
+// Create the events for the help panel.
+coverage.wire_up_help_panel = function () {
+    $("#keyboard_icon").click(function () {
+        // Show the help panel, and position it so the keyboard icon in the
+        // panel is in the same place as the keyboard icon in the header.
+        $(".help_panel").show();
+        var koff = $("#keyboard_icon").offset();
+        var poff = $("#panel_icon").position();
+        $(".help_panel").offset({
+            top: koff.top-poff.top,
+            left: koff.left-poff.left
+        });
+    });
+    $("#panel_icon").click(function () {
+        $(".help_panel").hide();
+    });
+};
+
+// Create the events for the filter box.
+coverage.wire_up_filter = function () {
+    // Cache elements.
+    var table = $("table.index");
+    var table_rows = table.find("tbody tr");
+    var table_row_names = table_rows.find("td.name a");
+    var no_rows = $("#no_rows");
+
+    // Create a duplicate table footer that we can modify with dynamic summed values.
+    var table_footer = $("table.index tfoot tr");
+    var table_dynamic_footer = table_footer.clone();
+    table_dynamic_footer.attr('class', 'total_dynamic hidden');
+    table_footer.after(table_dynamic_footer);
+
+    // Observe filter keyevents.
+    $("#filter").on("keyup change", $.debounce(150, function (event) {
+        var filter_value = $(this).val();
+
+        if (filter_value === "") {
+            // Filter box is empty, remove all filtering.
+            table_rows.removeClass("hidden");
+
+            // Show standard footer, hide dynamic footer.
+            table_footer.removeClass("hidden");
+            table_dynamic_footer.addClass("hidden");
+
+            // Hide placeholder, show table.
+            if (no_rows.length > 0) {
+                no_rows.hide();
+            }
+            table.show();
+
+        }
+        else {
+            // Filter table items by value.
+            var hidden = 0;
+            var shown = 0;
+
+            // Hide / show elements.
+            $.each(table_row_names, function () {
+                var element = $(this).parents("tr");
+
+                if ($(this).text().indexOf(filter_value) === -1) {
+                    // hide
+                    element.addClass("hidden");
+                    hidden++;
+                }
+                else {
+                    // show
+                    element.removeClass("hidden");
+                    shown++;
+                }
+            });
+
+            // Show placeholder if no rows will be displayed.
+            if (no_rows.length > 0) {
+                if (shown === 0) {
+                    // Show placeholder, hide table.
+                    no_rows.show();
+                    table.hide();
+                }
+                else {
+                    // Hide placeholder, show table.
+                    no_rows.hide();
+                    table.show();
+                }
+            }
+
+            // Manage dynamic header:
+            if (hidden > 0) {
+                // Calculate new dynamic sum values based on visible rows.
+                for (var column = 2; column < 20; column++) {
+                    // Calculate summed value.
+                    var cells = table_rows.find('td:nth-child(' + column + ')');
+                    if (!cells.length) {
+                        // No more columns...!
+                        break;
+                    }
+
+                    var sum = 0, numer = 0, denom = 0;
+                    $.each(cells.filter(':visible'), function () {
+                        var ratio = $(this).data("ratio");
+                        if (ratio) {
+                            var splitted = ratio.split(" ");
+                            numer += parseInt(splitted[0], 10);
+                            denom += parseInt(splitted[1], 10);
+                        }
+                        else {
+                            sum += parseInt(this.innerHTML, 10);
+                        }
+                    });
+
+                    // Get footer cell element.
+                    var footer_cell = table_dynamic_footer.find('td:nth-child(' + column + ')');
+
+                    // Set value into dynamic footer cell element.
+                    if (cells[0].innerHTML.indexOf('%') > -1) {
+                        // Percentage columns use the numerator and denominator,
+                        // and adapt to the number of decimal places.
+                        var match = /\.([0-9]+)/.exec(cells[0].innerHTML);
+                        var places = 0;
+                        if (match) {
+                            places = match[1].length;
+                        }
+                        var pct = numer * 100 / denom;
+                        footer_cell.text(pct.toFixed(places) + '%');
+                    }
+                    else {
+                        footer_cell.text(sum);
+                    }
+                }
+
+                // Hide standard footer, show dynamic footer.
+                table_footer.addClass("hidden");
+                table_dynamic_footer.removeClass("hidden");
+            }
+            else {
+                // Show standard footer, hide dynamic footer.
+                table_footer.removeClass("hidden");
+                table_dynamic_footer.addClass("hidden");
+            }
+        }
+    }));
+
+    // Trigger change event on setup, to force filter on page refresh
+    // (filter value may still be present).
+    $("#filter").trigger("change");
+};
+
+// Loaded on index.html
+coverage.index_ready = function ($) {
+    // Look for a localStorage item containing previous sort settings:
+    var sort_list = [];
+    var storage_name = "COVERAGE_INDEX_SORT";
+    var stored_list = undefined;
+    try {
+        stored_list = localStorage.getItem(storage_name);
+    } catch(err) {}
+
+    if (stored_list) {
+        sort_list = JSON.parse('[[' + stored_list + ']]');
+    }
+
+    // Create a new widget which exists only to save and restore
+    // the sort order:
+    $.tablesorter.addWidget({
+        id: "persistentSort",
+
+        // Format is called by the widget before displaying:
+        format: function (table) {
+            if (table.config.sortList.length === 0 && sort_list.length > 0) {
+                // This table hasn't been sorted before - we'll use
+                // our stored settings:
+                $(table).trigger('sorton', [sort_list]);
+            }
+            else {
+                // This is not the first load - something has
+                // already defined sorting so we'll just update
+                // our stored value to match:
+                sort_list = table.config.sortList;
+            }
+        }
+    });
+
+    // Configure our tablesorter to handle the variable number of
+    // columns produced depending on report options:
+    var headers = [];
+    var col_count = $("table.index > thead > tr > th").length;
+
+    headers[0] = { sorter: 'text' };
+    for (i = 1; i < col_count-1; i++) {
+        headers[i] = { sorter: 'digit' };
+    }
+    headers[col_count-1] = { sorter: 'percent' };
+
+    // Enable the table sorter:
+    $("table.index").tablesorter({
+        widgets: ['persistentSort'],
+        headers: headers
+    });
+
+    coverage.assign_shortkeys();
+    coverage.wire_up_help_panel();
+    coverage.wire_up_filter();
+
+    // Watch for page unload events so we can save the final sort settings:
+    $(window).on("unload", function () {
+        try {
+            localStorage.setItem(storage_name, sort_list.toString())
+        } catch(err) {}
+    });
+};
+
+// -- pyfile stuff --
+
+coverage.LINE_FILTERS_STORAGE = "COVERAGE_LINE_FILTERS";
+
+coverage.pyfile_ready = function ($) {
+    // If we're directed to a particular line number, highlight the line.
+    var frag = location.hash;
+    if (frag.length > 2 && frag[1] === 't') {
+        $(frag).addClass('highlight');
+        coverage.set_sel(parseInt(frag.substr(2), 10));
+    }
+    else {
+        coverage.set_sel(0);
+    }
+
+    $(document)
+        .bind('keydown', 'j', coverage.to_next_chunk_nicely)
+        .bind('keydown', 'k', coverage.to_prev_chunk_nicely)
+        .bind('keydown', '0', coverage.to_top)
+        .bind('keydown', '1', coverage.to_first_chunk)
+        ;
+
+    $(".button_toggle_run").click(function (evt) {coverage.toggle_lines(evt.target, "run");});
+    $(".button_toggle_exc").click(function (evt) {coverage.toggle_lines(evt.target, "exc");});
+    $(".button_toggle_mis").click(function (evt) {coverage.toggle_lines(evt.target, "mis");});
+    $(".button_toggle_par").click(function (evt) {coverage.toggle_lines(evt.target, "par");});
+
+    coverage.filters = undefined;
+    try {
+        coverage.filters = localStorage.getItem(coverage.LINE_FILTERS_STORAGE);
+    } catch(err) {}
+
+    if (coverage.filters) {
+        coverage.filters = JSON.parse(coverage.filters);
+    }
+    else {
+        coverage.filters = {run: false, exc: true, mis: true, par: true};
+    }
+
+    for (cls in coverage.filters) {
+        coverage.set_line_visibilty(cls, coverage.filters[cls]);
+    }
+
+    coverage.assign_shortkeys();
+    coverage.wire_up_help_panel();
+
+    coverage.init_scroll_markers();
+
+    // Rebuild scroll markers when the window height changes.
+    $(window).resize(coverage.build_scroll_markers);
+};
+
+coverage.toggle_lines = function (btn, cls) {
+    var onoff = !$(btn).hasClass("show_" + cls);
+    coverage.set_line_visibilty(cls, onoff);
+    coverage.build_scroll_markers();
+    coverage.filters[cls] = onoff;
+    try {
+        localStorage.setItem(coverage.LINE_FILTERS_STORAGE, JSON.stringify(coverage.filters));
+    } catch(err) {}
+};
+
+coverage.set_line_visibilty = function (cls, onoff) {
+    var show = "show_" + cls;
+    var btn = $(".button_toggle_" + cls);
+    if (onoff) {
+        $("#source ." + cls).addClass(show);
+        btn.addClass(show);
+    }
+    else {
+        $("#source ." + cls).removeClass(show);
+        btn.removeClass(show);
+    }
+};
+
+// Return the nth line div.
+coverage.line_elt = function (n) {
+    return $("#t" + n);
+};
+
+// Return the nth line number div.
+coverage.num_elt = function (n) {
+    return $("#n" + n);
+};
+
+// Set the selection.  b and e are line numbers.
+coverage.set_sel = function (b, e) {
+    // The first line selected.
+    coverage.sel_begin = b;
+    // The next line not selected.
+    coverage.sel_end = (e === undefined) ? b+1 : e;
+};
+
+coverage.to_top = function () {
+    coverage.set_sel(0, 1);
+    coverage.scroll_window(0);
+};
+
+coverage.to_first_chunk = function () {
+    coverage.set_sel(0, 1);
+    coverage.to_next_chunk();
+};
+
+// Return a string indicating what kind of chunk this line belongs to,
+// or null if not a chunk.
+coverage.chunk_indicator = function (line_elt) {
+    var klass = line_elt.attr('class');
+    if (klass) {
+        var m = klass.match(/\bshow_\w+\b/);
+        if (m) {
+            return m[0];
+        }
+    }
+    return null;
+};
+
+coverage.to_next_chunk = function () {
+    var c = coverage;
+
+    // Find the start of the next colored chunk.
+    var probe = c.sel_end;
+    var chunk_indicator, probe_line;
+    while (true) {
+        probe_line = c.line_elt(probe);
+        if (probe_line.length === 0) {
+            return;
+        }
+        chunk_indicator = c.chunk_indicator(probe_line);
+        if (chunk_indicator) {
+            break;
+        }
+        probe++;
+    }
+
+    // There's a next chunk, `probe` points to it.
+    var begin = probe;
+
+    // Find the end of this chunk.
+    var next_indicator = chunk_indicator;
+    while (next_indicator === chunk_indicator) {
+        probe++;
+        probe_line = c.line_elt(probe);
+        next_indicator = c.chunk_indicator(probe_line);
+    }
+    c.set_sel(begin, probe);
+    c.show_selection();
+};
+
+coverage.to_prev_chunk = function () {
+    var c = coverage;
+
+    // Find the end of the prev colored chunk.
+    var probe = c.sel_begin-1;
+    var probe_line = c.line_elt(probe);
+    if (probe_line.length === 0) {
+        return;
+    }
+    var chunk_indicator = c.chunk_indicator(probe_line);
+    while (probe > 0 && !chunk_indicator) {
+        probe--;
+        probe_line = c.line_elt(probe);
+        if (probe_line.length === 0) {
+            return;
+        }
+        chunk_indicator = c.chunk_indicator(probe_line);
+    }
+
+    // There's a prev chunk, `probe` points to its last line.
+    var end = probe+1;
+
+    // Find the beginning of this chunk.
+    var prev_indicator = chunk_indicator;
+    while (prev_indicator === chunk_indicator) {
+        probe--;
+        probe_line = c.line_elt(probe);
+        prev_indicator = c.chunk_indicator(probe_line);
+    }
+    c.set_sel(probe+1, end);
+    c.show_selection();
+};
+
+// Return the line number of the line nearest pixel position pos
+coverage.line_at_pos = function (pos) {
+    var l1 = coverage.line_elt(1),
+        l2 = coverage.line_elt(2),
+        result;
+    if (l1.length && l2.length) {
+        var l1_top = l1.offset().top,
+            line_height = l2.offset().top - l1_top,
+            nlines = (pos - l1_top) / line_height;
+        if (nlines < 1) {
+            result = 1;
+        }
+        else {
+            result = Math.ceil(nlines);
+        }
+    }
+    else {
+        result = 1;
+    }
+    return result;
+};
+
+// Returns 0, 1, or 2: how many of the two ends of the selection are on
+// the screen right now?
+coverage.selection_ends_on_screen = function () {
+    if (coverage.sel_begin === 0) {
+        return 0;
+    }
+
+    var top = coverage.line_elt(coverage.sel_begin);
+    var next = coverage.line_elt(coverage.sel_end-1);
+
+    return (
+        (top.isOnScreen() ? 1 : 0) +
+        (next.isOnScreen() ? 1 : 0)
+    );
+};
+
+coverage.to_next_chunk_nicely = function () {
+    coverage.finish_scrolling();
+    if (coverage.selection_ends_on_screen() === 0) {
+        // The selection is entirely off the screen: select the top line on
+        // the screen.
+        var win = $(window);
+        coverage.select_line_or_chunk(coverage.line_at_pos(win.scrollTop()));
+    }
+    coverage.to_next_chunk();
+};
+
+coverage.to_prev_chunk_nicely = function () {
+    coverage.finish_scrolling();
+    if (coverage.selection_ends_on_screen() === 0) {
+        var win = $(window);
+        coverage.select_line_or_chunk(coverage.line_at_pos(win.scrollTop() + win.height()));
+    }
+    coverage.to_prev_chunk();
+};
+
+// Select line number lineno, or if it is in a colored chunk, select the
+// entire chunk
+coverage.select_line_or_chunk = function (lineno) {
+    var c = coverage;
+    var probe_line = c.line_elt(lineno);
+    if (probe_line.length === 0) {
+        return;
+    }
+    var the_indicator = c.chunk_indicator(probe_line);
+    if (the_indicator) {
+        // The line is in a highlighted chunk.
+        // Search backward for the first line.
+        var probe = lineno;
+        var indicator = the_indicator;
+        while (probe > 0 && indicator === the_indicator) {
+            probe--;
+            probe_line = c.line_elt(probe);
+            if (probe_line.length === 0) {
+                break;
+            }
+            indicator = c.chunk_indicator(probe_line);
+        }
+        var begin = probe + 1;
+
+        // Search forward for the last line.
+        probe = lineno;
+        indicator = the_indicator;
+        while (indicator === the_indicator) {
+            probe++;
+            probe_line = c.line_elt(probe);
+            indicator = c.chunk_indicator(probe_line);
+        }
+
+        coverage.set_sel(begin, probe);
+    }
+    else {
+        coverage.set_sel(lineno);
+    }
+};
+
+coverage.show_selection = function () {
+    var c = coverage;
+
+    // Highlight the lines in the chunk
+    $(".linenos .highlight").removeClass("highlight");
+    for (var probe = c.sel_begin; probe > 0 && probe < c.sel_end; probe++) {
+        c.num_elt(probe).addClass("highlight");
+    }
+
+    c.scroll_to_selection();
+};
+
+coverage.scroll_to_selection = function () {
+    // Scroll the page if the chunk isn't fully visible.
+    if (coverage.selection_ends_on_screen() < 2) {
+        // Need to move the page. The html,body trick makes it scroll in all
+        // browsers, got it from http://stackoverflow.com/questions/3042651
+        var top = coverage.line_elt(coverage.sel_begin);
+        var top_pos = parseInt(top.offset().top, 10);
+        coverage.scroll_window(top_pos - 30);
+    }
+};
+
+coverage.scroll_window = function (to_pos) {
+    $("html,body").animate({scrollTop: to_pos}, 200);
+};
+
+coverage.finish_scrolling = function () {
+    $("html,body").stop(true, true);
+};
+
+coverage.init_scroll_markers = function () {
+    var c = coverage;
+    // Init some variables
+    c.lines_len = $('#source p').length;
+    c.body_h = $('body').height();
+    c.header_h = $('div#header').height();
+
+    // Build html
+    c.build_scroll_markers();
+};
+
+coverage.build_scroll_markers = function () {
+    var c = coverage,
+        min_line_height = 3,
+        max_line_height = 10,
+        visible_window_h = $(window).height();
+
+    c.lines_to_mark = $('#source').find('p.show_run, p.show_mis, p.show_exc, p.show_exc, p.show_par');
+    $('#scroll_marker').remove();
+    // Don't build markers if the window has no scroll bar.
+    if (c.body_h <= visible_window_h) {
+        return;
+    }
+
+    $("body").append("<div id='scroll_marker'>&nbsp;</div>");
+    var scroll_marker = $('#scroll_marker'),
+        marker_scale = scroll_marker.height() / c.body_h,
+        line_height = scroll_marker.height() / c.lines_len;
+
+    // Line height must be between the extremes.
+    if (line_height > min_line_height) {
+        if (line_height > max_line_height) {
+            line_height = max_line_height;
+        }
+    }
+    else {
+        line_height = min_line_height;
+    }
+
+    var previous_line = -99,
+        last_mark,
+        last_top,
+        offsets = {};
+
+    // Calculate line offsets outside loop to prevent relayouts
+    c.lines_to_mark.each(function() {
+        offsets[this.id] = $(this).offset().top;
+    });
+    c.lines_to_mark.each(function () {
+        var id_name = $(this).attr('id'),
+            line_top = Math.round(offsets[id_name] * marker_scale),
+            line_number = parseInt(id_name.substring(1, id_name.length));
+
+        if (line_number === previous_line + 1) {
+            // If this solid missed block just make previous mark higher.
+            last_mark.css({
+                'height': line_top + line_height - last_top
+            });
+        }
+        else {
+            // Add colored line in scroll_marker block.
+            scroll_marker.append('<div id="m' + line_number + '" class="marker"></div>');
+            last_mark = $('#m' + line_number);
+            last_mark.css({
+                'height': line_height,
+                'top': line_top
+            });
+            last_top = line_top;
+        }
+
+        previous_line = line_number;
+    });
+};
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/favicon_32.png b/contrib/python/coverage/py3/coverage/htmlfiles/favicon_32.png
new file mode 100644
index 0000000000..8649f0475d
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/favicon_32.png
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/index.html b/contrib/python/coverage/py3/coverage/htmlfiles/index.html
new file mode 100644
index 0000000000..983db06125
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/index.html
@@ -0,0 +1,119 @@
+{# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 #}
+{# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt #}
+
+<!DOCTYPE html>
+<html>
+<head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    <title>{{ title|escape }}</title>
+    <link rel="icon" sizes="32x32" href="favicon_32.png">
+    <link rel="stylesheet" href="style.css" type="text/css">
+    {% if extra_css %}
+        <link rel="stylesheet" href="{{ extra_css }}" type="text/css">
+    {% endif %}
+    <script type="text/javascript" src="jquery.min.js"></script>
+    <script type="text/javascript" src="jquery.ba-throttle-debounce.min.js"></script>
+    <script type="text/javascript" src="jquery.tablesorter.min.js"></script>
+    <script type="text/javascript" src="jquery.hotkeys.js"></script>
+    <script type="text/javascript" src="coverage_html.js"></script>
+    <script type="text/javascript">
+        jQuery(document).ready(coverage.index_ready);
+    </script>
+</head>
+<body class="indexfile">
+
+<div id="header">
+    <div class="content">
+        <h1>{{ title|escape }}:
+            <span class="pc_cov">{{totals.pc_covered_str}}%</span>
+        </h1>
+
+        <img id="keyboard_icon" src="keybd_closed.png" alt="Show keyboard shortcuts" />
+
+        <form id="filter_container">
+            <input id="filter" type="text" value="" placeholder="filter..." />
+        </form>
+    </div>
+</div>
+
+<div class="help_panel">
+    <img id="panel_icon" src="keybd_open.png" alt="Hide keyboard shortcuts" />
+    <p class="legend">Hot-keys on this page</p>
+    <div>
+    <p class="keyhelp">
+        <span class="key">n</span>
+        <span class="key">s</span>
+        <span class="key">m</span>
+        <span class="key">x</span>
+        {% if has_arcs %}
+        <span class="key">b</span>
+        <span class="key">p</span>
+        {% endif %}
+        <span class="key">c</span> &nbsp; change column sorting
+    </p>
+    </div>
+</div>
+
+<div id="index">
+    <table class="index">
+        <thead>
+            {# The title="" attr doesn"t work in Safari. #}
+            <tr class="tablehead" title="Click to sort">
+                <th class="name left headerSortDown shortkey_n">Module</th>
+                <th class="shortkey_s">statements</th>
+                <th class="shortkey_m">missing</th>
+                <th class="shortkey_x">excluded</th>
+                {% if has_arcs %}
+                <th class="shortkey_b">branches</th>
+                <th class="shortkey_p">partial</th>
+                {% endif %}
+                <th class="right shortkey_c">coverage</th>
+            </tr>
+        </thead>
+        {# HTML syntax requires thead, tfoot, tbody #}
+        <tfoot>
+            <tr class="total">
+                <td class="name left">Total</td>
+                <td>{{totals.n_statements}}</td>
+                <td>{{totals.n_missing}}</td>
+                <td>{{totals.n_excluded}}</td>
+                {% if has_arcs %}
+                <td>{{totals.n_branches}}</td>
+                <td>{{totals.n_partial_branches}}</td>
+                {% endif %}
+                <td class="right" data-ratio="{{totals.ratio_covered|pair}}">{{totals.pc_covered_str}}%</td>
+            </tr>
+        </tfoot>
+        <tbody>
+            {% for file in files %}
+            <tr class="file">
+                <td class="name left"><a href="{{file.html_filename}}">{{file.relative_filename}}</a></td>
+                <td>{{file.nums.n_statements}}</td>
+                <td>{{file.nums.n_missing}}</td>
+                <td>{{file.nums.n_excluded}}</td>
+                {% if has_arcs %}
+                <td>{{file.nums.n_branches}}</td>
+                <td>{{file.nums.n_partial_branches}}</td>
+                {% endif %}
+                <td class="right" data-ratio="{{file.nums.ratio_covered|pair}}">{{file.nums.pc_covered_str}}%</td>
+            </tr>
+            {% endfor %}
+        </tbody>
+    </table>
+
+    <p id="no_rows">
+        No items found using the specified filter.
+    </p>
+</div>
+
+<div id="footer">
+    <div class="content">
+        <p>
+            <a class="nav" href="{{__url__}}">coverage.py v{{__version__}}</a>,
+            created at {{ time_stamp }}
+        </p>
+    </div>
+</div>
+
+</body>
+</html>
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/jquery.ba-throttle-debounce.min.js b/contrib/python/coverage/py3/coverage/htmlfiles/jquery.ba-throttle-debounce.min.js
new file mode 100644
index 0000000000..648fe5d3c2
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/jquery.ba-throttle-debounce.min.js
@@ -0,0 +1,9 @@
+/*
+ * jQuery throttle / debounce - v1.1 - 3/7/2010
+ * http://benalman.com/projects/jquery-throttle-debounce-plugin/
+ *
+ * Copyright (c) 2010 "Cowboy" Ben Alman
+ * Dual licensed under the MIT and GPL licenses.
+ * http://benalman.com/about/license/
+ */
+(function(b,c){var $=b.jQuery||b.Cowboy||(b.Cowboy={}),a;$.throttle=a=function(e,f,j,i){var h,d=0;if(typeof f!=="boolean"){i=j;j=f;f=c}function g(){var o=this,m=+new Date()-d,n=arguments;function l(){d=+new Date();j.apply(o,n)}function k(){h=c}if(i&&!h){l()}h&&clearTimeout(h);if(i===c&&m>e){l()}else{if(f!==true){h=setTimeout(i?k:l,i===c?e-m:e)}}}if($.guid){g.guid=j.guid=j.guid||$.guid++}return g};$.debounce=function(d,e,f){return f===c?a(d,e,false):a(d,f,e!==false)}})(this);
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/jquery.hotkeys.js b/contrib/python/coverage/py3/coverage/htmlfiles/jquery.hotkeys.js
new file mode 100644
index 0000000000..09b21e03c7
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/jquery.hotkeys.js
@@ -0,0 +1,99 @@
+/*
+ * jQuery Hotkeys Plugin
+ * Copyright 2010, John Resig
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ *
+ * Based upon the plugin by Tzury Bar Yochay:
+ * http://github.com/tzuryby/hotkeys
+ *
+ * Original idea by:
+ * Binny V A, http://www.openjs.com/scripts/events/keyboard_shortcuts/
+*/
+
+(function(jQuery){
+
+	jQuery.hotkeys = {
+		version: "0.8",
+
+		specialKeys: {
+			8: "backspace", 9: "tab", 13: "return", 16: "shift", 17: "ctrl", 18: "alt", 19: "pause",
+			20: "capslock", 27: "esc", 32: "space", 33: "pageup", 34: "pagedown", 35: "end", 36: "home",
+			37: "left", 38: "up", 39: "right", 40: "down", 45: "insert", 46: "del",
+			96: "0", 97: "1", 98: "2", 99: "3", 100: "4", 101: "5", 102: "6", 103: "7",
+			104: "8", 105: "9", 106: "*", 107: "+", 109: "-", 110: ".", 111 : "/",
+			112: "f1", 113: "f2", 114: "f3", 115: "f4", 116: "f5", 117: "f6", 118: "f7", 119: "f8",
+			120: "f9", 121: "f10", 122: "f11", 123: "f12", 144: "numlock", 145: "scroll", 191: "/", 224: "meta"
+		},
+
+		shiftNums: {
+			"`": "~", "1": "!", "2": "@", "3": "#", "4": "$", "5": "%", "6": "^", "7": "&",
+			"8": "*", "9": "(", "0": ")", "-": "_", "=": "+", ";": ": ", "'": "\"", ",": "<",
+			".": ">",  "/": "?",  "\\": "|"
+		}
+	};
+
+	function keyHandler( handleObj ) {
+		// Only care when a possible input has been specified
+		if ( typeof handleObj.data !== "string" ) {
+			return;
+		}
+
+		var origHandler = handleObj.handler,
+			keys = handleObj.data.toLowerCase().split(" ");
+
+		handleObj.handler = function( event ) {
+			// Don't fire in text-accepting inputs that we didn't directly bind to
+			if ( this !== event.target && (/textarea|select/i.test( event.target.nodeName ) ||
+				 event.target.type === "text") ) {
+				return;
+			}
+
+			// Keypress represents characters, not special keys
+			var special = event.type !== "keypress" && jQuery.hotkeys.specialKeys[ event.which ],
+				character = String.fromCharCode( event.which ).toLowerCase(),
+				key, modif = "", possible = {};
+
+			// check combinations (alt|ctrl|shift+anything)
+			if ( event.altKey && special !== "alt" ) {
+				modif += "alt+";
+			}
+
+			if ( event.ctrlKey && special !== "ctrl" ) {
+				modif += "ctrl+";
+			}
+
+			// TODO: Need to make sure this works consistently across platforms
+			if ( event.metaKey && !event.ctrlKey && special !== "meta" ) {
+				modif += "meta+";
+			}
+
+			if ( event.shiftKey && special !== "shift" ) {
+				modif += "shift+";
+			}
+
+			if ( special ) {
+				possible[ modif + special ] = true;
+
+			} else {
+				possible[ modif + character ] = true;
+				possible[ modif + jQuery.hotkeys.shiftNums[ character ] ] = true;
+
+				// "$" can be triggered as "Shift+4" or "Shift+$" or just "$"
+				if ( modif === "shift+" ) {
+					possible[ jQuery.hotkeys.shiftNums[ character ] ] = true;
+				}
+			}
+
+			for ( var i = 0, l = keys.length; i < l; i++ ) {
+				if ( possible[ keys[i] ] ) {
+					return origHandler.apply( this, arguments );
+				}
+			}
+		};
+	}
+
+	jQuery.each([ "keydown", "keyup", "keypress" ], function() {
+		jQuery.event.special[ this ] = { add: keyHandler };
+	});
+
+})( jQuery );
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/jquery.isonscreen.js b/contrib/python/coverage/py3/coverage/htmlfiles/jquery.isonscreen.js
new file mode 100644
index 0000000000..0182ebd213
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/jquery.isonscreen.js
@@ -0,0 +1,53 @@
+/* Copyright (c) 2010
+ * @author Laurence Wheway
+ * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
+ * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
+ *
+ * @version 1.2.0
+ */
+(function($) {
+	jQuery.extend({
+		isOnScreen: function(box, container) {
+			//ensure numbers come in as intgers (not strings) and remove 'px' is it's there
+			for(var i in box){box[i] = parseFloat(box[i])};
+			for(var i in container){container[i] = parseFloat(container[i])};
+
+			if(!container){
+				container = {
+					left: $(window).scrollLeft(),
+					top: $(window).scrollTop(),
+					width: $(window).width(),
+					height: $(window).height()
+				}
+			}
+
+			if(	box.left+box.width-container.left > 0 &&
+				box.left < container.width+container.left &&
+				box.top+box.height-container.top > 0 &&
+				box.top < container.height+container.top
+			) return true;
+			return false;
+		}
+	})
+
+
+	jQuery.fn.isOnScreen = function (container) {
+		for(var i in container){container[i] = parseFloat(container[i])};
+
+		if(!container){
+			container = {
+				left: $(window).scrollLeft(),
+				top: $(window).scrollTop(),
+				width: $(window).width(),
+				height: $(window).height()
+			}
+		}
+
+		if(	$(this).offset().left+$(this).width()-container.left > 0 &&
+			$(this).offset().left < container.width+container.left &&
+			$(this).offset().top+$(this).height()-container.top > 0 &&
+			$(this).offset().top < container.height+container.top
+		) return true;
+		return false;
+	}
+})(jQuery);
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/jquery.min.js b/contrib/python/coverage/py3/coverage/htmlfiles/jquery.min.js
new file mode 100644
index 0000000000..d1608e37ff
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/jquery.min.js
@@ -0,0 +1,4 @@
+/*! jQuery v1.11.1 | (c) 2005, 2014 jQuery Foundation, Inc. | jquery.org/license */
+!function(a,b){"object"==typeof module&&"object"==typeof module.exports?module.exports=a.document?b(a,!0):function(a){if(!a.document)throw new Error("jQuery requires a window with a document");return b(a)}:b(a)}("undefined"!=typeof window?window:this,function(a,b){var c=[],d=c.slice,e=c.concat,f=c.push,g=c.indexOf,h={},i=h.toString,j=h.hasOwnProperty,k={},l="1.11.1",m=function(a,b){return new m.fn.init(a,b)},n=/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,o=/^-ms-/,p=/-([\da-z])/gi,q=function(a,b){return b.toUpperCase()};m.fn=m.prototype={jquery:l,constructor:m,selector:"",length:0,toArray:function(){return d.call(this)},get:function(a){return null!=a?0>a?this[a+this.length]:this[a]:d.call(this)},pushStack:function(a){var b=m.merge(this.constructor(),a);return b.prevObject=this,b.context=this.context,b},each:function(a,b){return m.each(this,a,b)},map:function(a){return this.pushStack(m.map(this,function(b,c){return a.call(b,c,b)}))},slice:function(){return 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totalRows=(table.tBodies[0]&&table.tBodies[0].rows.length)||0,totalCells=(table.tBodies[0].rows[0]&&table.tBodies[0].rows[0].cells.length)||0,parsers=table.config.parsers,cache={row:[],normalized:[]};for(var i=0;i<totalRows;++i){var c=table.tBodies[0].rows[i],cols=[];cache.row.push($(c));for(var j=0;j<totalCells;++j){cols.push(parsers[j].format(getElementText(table.config,c.cells[j]),table,c.cells[j]));}cols.push(i);cache.normalized.push(cols);cols=null;};if(table.config.debug){benchmark("Building cache for "+totalRows+" rows:",cacheTime);}return cache;};function getElementText(config,node){if(!node)return"";var t="";if(config.textExtraction=="simple"){if(node.childNodes[0]&&node.childNodes[0].hasChildNodes()){t=node.childNodes[0].innerHTML;}else{t=node.innerHTML;}}else{if(typeof(config.textExtraction)=="function"){t=config.textExtraction(node);}else{t=$(node).text();}}return t;}function appendToTable(table,cache){if(table.config.debug){var appendTime=new Date()}var 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td",table.tBodies[0]).each(function(){colgroup.append($('<col>').css('width',$(this).width()));});$(table).prepend(colgroup);};}function updateHeaderSortCount(table,sortList){var c=table.config,l=sortList.length;for(var i=0;i<l;i++){var s=sortList[i],o=c.headerList[s[0]];o.count=s[1];o.count++;}}function multisort(table,sortList,cache){if(table.config.debug){var sortTime=new Date();}var dynamicExp="var sortWrapper = function(a,b) {",l=sortList.length;for(var i=0;i<l;i++){var c=sortList[i][0];var order=sortList[i][1];var s=(getCachedSortType(table.config.parsers,c)=="text")?((order==0)?"sortText":"sortTextDesc"):((order==0)?"sortNumeric":"sortNumericDesc");var e="e"+i;dynamicExp+="var "+e+" = "+s+"(a["+c+"],b["+c+"]); ";dynamicExp+="if("+e+") { return "+e+"; } ";dynamicExp+="else { ";}var orgOrderCol=cache.normalized[0].length-1;dynamicExp+="return a["+orgOrderCol+"]-b["+orgOrderCol+"];";for(var i=0;i<l;i++){dynamicExp+="}; ";}dynamicExp+="return 0; ";dynamicExp+="}; 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\ No newline at end of file
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/keybd_closed.png b/contrib/python/coverage/py3/coverage/htmlfiles/keybd_closed.png
new file mode 100644
index 0000000000..db114023f0
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/keybd_closed.png
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/keybd_open.png b/contrib/python/coverage/py3/coverage/htmlfiles/keybd_open.png
new file mode 100644
index 0000000000..db114023f0
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/keybd_open.png
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/pyfile.html b/contrib/python/coverage/py3/coverage/htmlfiles/pyfile.html
new file mode 100644
index 0000000000..e15be066fb
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/pyfile.html
@@ -0,0 +1,113 @@
+{# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 #}
+{# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt #}
+
+<!DOCTYPE html>
+<html>
+<head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+    {# IE8 rounds line-height incorrectly, and adding this emulateIE7 line makes it right! #}
+    {# http://social.msdn.microsoft.com/Forums/en-US/iewebdevelopment/thread/7684445e-f080-4d8f-8529-132763348e21 #}
+    <meta http-equiv="X-UA-Compatible" content="IE=emulateIE7" />
+    <title>Coverage for {{relative_filename|escape}}: {{nums.pc_covered_str}}%</title>
+    <link rel="icon" sizes="32x32" href="favicon_32.png">
+    <link rel="stylesheet" href="style.css" type="text/css">
+    {% if extra_css %}
+        <link rel="stylesheet" href="{{ extra_css }}" type="text/css">
+    {% endif %}
+    <script type="text/javascript" src="jquery.min.js"></script>
+    <script type="text/javascript" src="jquery.hotkeys.js"></script>
+    <script type="text/javascript" src="jquery.isonscreen.js"></script>
+    <script type="text/javascript" src="coverage_html.js"></script>
+    <script type="text/javascript">
+        jQuery(document).ready(coverage.pyfile_ready);
+    </script>
+</head>
+<body class="pyfile">
+
+<div id="header">
+    <div class="content">
+        <h1>Coverage for <b>{{relative_filename|escape}}</b> :
+            <span class="pc_cov">{{nums.pc_covered_str}}%</span>
+        </h1>
+
+        <img id="keyboard_icon" src="keybd_closed.png" alt="Show keyboard shortcuts" />
+
+        <h2 class="stats">
+            {{nums.n_statements}} statements &nbsp;
+            <button type="button" class="{{category.run}} shortkey_r button_toggle_run" title="Toggle lines run">{{nums.n_executed}} run</button>
+            <button type="button" class="{{category.mis}} shortkey_m button_toggle_mis" title="Toggle lines missing">{{nums.n_missing}} missing</button>
+            <button type="button" class="{{category.exc}} shortkey_x button_toggle_exc" title="Toggle lines excluded">{{nums.n_excluded}} excluded</button>
+
+            {% if has_arcs %}
+            <button type="button" class="{{category.par}} shortkey_p button_toggle_par" title="Toggle lines partially run">{{nums.n_partial_branches}} partial</button>
+            {% endif %}
+        </h2>
+    </div>
+</div>
+
+<div class="help_panel">
+    <img id="panel_icon" src="keybd_open.png" alt="Hide keyboard shortcuts" />
+    <p class="legend">Hot-keys on this page</p>
+    <div>
+    <p class="keyhelp">
+        <span class="key">r</span>
+        <span class="key">m</span>
+        <span class="key">x</span>
+        <span class="key">p</span> &nbsp; toggle line displays
+    </p>
+    <p class="keyhelp">
+        <span class="key">j</span>
+        <span class="key">k</span> &nbsp; next/prev highlighted chunk
+    </p>
+    <p class="keyhelp">
+        <span class="key">0</span> &nbsp; (zero) top of page
+    </p>
+    <p class="keyhelp">
+        <span class="key">1</span> &nbsp; (one) first highlighted chunk
+    </p>
+    </div>
+</div>
+
+<div id="source">
+    {% for line in lines -%}
+        {% joined %}
+        <p id="t{{line.number}}" class="{{line.css_class}}">
+            <span class="n"><a href="#t{{line.number}}">{{line.number}}</a></span>
+            <span class="t">{{line.html}}&nbsp;</span>
+            {% if line.context_list %}
+                <input type="checkbox" id="ctxs{{line.number}}" />
+            {% endif %}
+            {# Things that should float right in the line. #}
+            <span class="r">
+                {% if line.annotate %}
+                    <span class="annotate short">{{line.annotate}}</span>
+                    <span class="annotate long">{{line.annotate_long}}</span>
+                {% endif %}
+                {% if line.contexts %}
+                    <label for="ctxs{{line.number}}" class="ctx">{{ line.contexts_label }}</label>
+                {% endif %}
+            </span>
+            {# Things that should appear below the line. #}
+            {% if line.context_list %}
+                <span class="ctxs">
+                    {% for context in line.context_list %}
+                        <span>{{context}}</span>
+                    {% endfor %}
+                </span>
+            {% endif %}
+        </p>
+        {% endjoined %}
+    {% endfor %}
+</div>
+
+<div id="footer">
+    <div class="content">
+        <p>
+            <a class="nav" href="index.html">&#xab; index</a> &nbsp; &nbsp; <a class="nav" href="{{__url__}}">coverage.py v{{__version__}}</a>,
+            created at {{ time_stamp }}
+        </p>
+    </div>
+</div>
+
+</body>
+</html>
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/style.css b/contrib/python/coverage/py3/coverage/htmlfiles/style.css
new file mode 100644
index 0000000000..36ee2a6e65
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/style.css
@@ -0,0 +1,291 @@
+@charset "UTF-8";
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+/* Don't edit this .css file. Edit the .scss file instead! */
+html, body, h1, h2, h3, p, table, td, th { margin: 0; padding: 0; border: 0; font-weight: inherit; font-style: inherit; font-size: 100%; font-family: inherit; vertical-align: baseline; }
+
+body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; font-size: 1em; background: #fff; color: #000; }
+
+@media (prefers-color-scheme: dark) { body { background: #1e1e1e; } }
+
+@media (prefers-color-scheme: dark) { body { color: #eee; } }
+
+html > body { font-size: 16px; }
+
+a:active, a:focus { outline: 2px dashed #007acc; }
+
+p { font-size: .875em; line-height: 1.4em; }
+
+table { border-collapse: collapse; }
+
+td { vertical-align: top; }
+
+table tr.hidden { display: none !important; }
+
+p#no_rows { display: none; font-size: 1.2em; }
+
+a.nav { text-decoration: none; color: inherit; }
+
+a.nav:hover { text-decoration: underline; color: inherit; }
+
+#header { background: #f8f8f8; width: 100%; border-bottom: 1px solid #eee; }
+
+@media (prefers-color-scheme: dark) { #header { background: black; } }
+
+@media (prefers-color-scheme: dark) { #header { border-color: #333; } }
+
+.indexfile #footer { margin: 1rem 3.5rem; }
+
+.pyfile #footer { margin: 1rem 1rem; }
+
+#footer .content { padding: 0; color: #666; font-style: italic; }
+
+@media (prefers-color-scheme: dark) { #footer .content { color: #aaa; } }
+
+#index { margin: 1rem 0 0 3.5rem; }
+
+#header .content { padding: 1rem 3.5rem; }
+
+h1 { font-size: 1.25em; display: inline-block; }
+
+#filter_container { float: right; margin: 0 2em 0 0; }
+
+#filter_container input { width: 10em; padding: 0.2em 0.5em; border: 2px solid #ccc; background: #fff; color: #000; }
+
+@media (prefers-color-scheme: dark) { #filter_container input { border-color: #444; } }
+
+@media (prefers-color-scheme: dark) { #filter_container input { background: #1e1e1e; } }
+
+@media (prefers-color-scheme: dark) { #filter_container input { color: #eee; } }
+
+#filter_container input:focus { border-color: #007acc; }
+
+h2.stats { margin-top: .5em; font-size: 1em; }
+
+.stats button { font-family: inherit; font-size: inherit; border: 1px solid; border-radius: .2em; color: inherit; padding: .1em .5em; margin: 1px calc(.1em + 1px); cursor: pointer; border-color: #ccc; }
+
+@media (prefers-color-scheme: dark) { .stats button { border-color: #444; } }
+
+.stats button:active, .stats button:focus { outline: 2px dashed #007acc; }
+
+.stats button:active, .stats button:focus { outline: 2px dashed #007acc; }
+
+.stats button.run { background: #eeffee; }
+
+@media (prefers-color-scheme: dark) { .stats button.run { background: #373d29; } }
+
+.stats button.run.show_run { background: #dfd; border: 2px solid #00dd00; margin: 0 .1em; }
+
+@media (prefers-color-scheme: dark) { .stats button.run.show_run { background: #373d29; } }
+
+.stats button.mis { background: #ffeeee; }
+
+@media (prefers-color-scheme: dark) { .stats button.mis { background: #4b1818; } }
+
+.stats button.mis.show_mis { background: #fdd; border: 2px solid #ff0000; margin: 0 .1em; }
+
+@media (prefers-color-scheme: dark) { .stats button.mis.show_mis { background: #4b1818; } }
+
+.stats button.exc { background: #f7f7f7; }
+
+@media (prefers-color-scheme: dark) { .stats button.exc { background: #333; } }
+
+.stats button.exc.show_exc { background: #eee; border: 2px solid #808080; margin: 0 .1em; }
+
+@media (prefers-color-scheme: dark) { .stats button.exc.show_exc { background: #333; } }
+
+.stats button.par { background: #ffffd5; }
+
+@media (prefers-color-scheme: dark) { .stats button.par { background: #650; } }
+
+.stats button.par.show_par { background: #ffa; border: 2px solid #dddd00; margin: 0 .1em; }
+
+@media (prefers-color-scheme: dark) { .stats button.par.show_par { background: #650; } }
+
+.help_panel, #source p .annotate.long { display: none; position: absolute; z-index: 999; background: #ffffcc; border: 1px solid #888; border-radius: .2em; color: #333; padding: .25em .5em; }
+
+#source p .annotate.long { white-space: normal; float: right; top: 1.75em; right: 1em; height: auto; }
+
+#keyboard_icon { float: right; margin: 5px; cursor: pointer; }
+
+.help_panel { padding: .5em; border: 1px solid #883; }
+
+.help_panel .legend { font-style: italic; margin-bottom: 1em; }
+
+.indexfile .help_panel { width: 20em; min-height: 4em; }
+
+.pyfile .help_panel { width: 16em; min-height: 8em; }
+
+#panel_icon { float: right; cursor: pointer; }
+
+.keyhelp { margin: .75em; }
+
+.keyhelp .key { border: 1px solid black; border-color: #888 #333 #333 #888; padding: .1em .35em; font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-weight: bold; background: #eee; }
+
+#source { padding: 1em 0 1em 3.5rem; font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; }
+
+#source p { position: relative; white-space: pre; }
+
+#source p * { box-sizing: border-box; }
+
+#source p .n { float: left; text-align: right; width: 3.5rem; box-sizing: border-box; margin-left: -3.5rem; padding-right: 1em; color: #999; }
+
+@media (prefers-color-scheme: dark) { #source p .n { color: #777; } }
+
+#source p .n a { text-decoration: none; color: #999; }
+
+@media (prefers-color-scheme: dark) { #source p .n a { color: #777; } }
+
+#source p .n a:hover { text-decoration: underline; color: #999; }
+
+@media (prefers-color-scheme: dark) { #source p .n a:hover { color: #777; } }
+
+#source p.highlight .n { background: #ffdd00; }
+
+#source p .t { display: inline-block; width: 100%; box-sizing: border-box; margin-left: -.5em; padding-left: 0.3em; border-left: 0.2em solid #fff; }
+
+@media (prefers-color-scheme: dark) { #source p .t { border-color: #1e1e1e; } }
+
+#source p .t:hover { background: #f2f2f2; }
+
+@media (prefers-color-scheme: dark) { #source p .t:hover { background: #282828; } }
+
+#source p .t:hover ~ .r .annotate.long { display: block; }
+
+#source p .t .com { color: #008000; font-style: italic; line-height: 1px; }
+
+@media (prefers-color-scheme: dark) { #source p .t .com { color: #6A9955; } }
+
+#source p .t .key { font-weight: bold; line-height: 1px; }
+
+#source p .t .str { color: #0451A5; }
+
+@media (prefers-color-scheme: dark) { #source p .t .str { color: #9CDCFE; } }
+
+#source p.mis .t { border-left: 0.2em solid #ff0000; }
+
+#source p.mis.show_mis .t { background: #fdd; }
+
+@media (prefers-color-scheme: dark) { #source p.mis.show_mis .t { background: #4b1818; } }
+
+#source p.mis.show_mis .t:hover { background: #f2d2d2; }
+
+@media (prefers-color-scheme: dark) { #source p.mis.show_mis .t:hover { background: #532323; } }
+
+#source p.run .t { border-left: 0.2em solid #00dd00; }
+
+#source p.run.show_run .t { background: #dfd; }
+
+@media (prefers-color-scheme: dark) { #source p.run.show_run .t { background: #373d29; } }
+
+#source p.run.show_run .t:hover { background: #d2f2d2; }
+
+@media (prefers-color-scheme: dark) { #source p.run.show_run .t:hover { background: #404633; } }
+
+#source p.exc .t { border-left: 0.2em solid #808080; }
+
+#source p.exc.show_exc .t { background: #eee; }
+
+@media (prefers-color-scheme: dark) { #source p.exc.show_exc .t { background: #333; } }
+
+#source p.exc.show_exc .t:hover { background: #e2e2e2; }
+
+@media (prefers-color-scheme: dark) { #source p.exc.show_exc .t:hover { background: #3c3c3c; } }
+
+#source p.par .t { border-left: 0.2em solid #dddd00; }
+
+#source p.par.show_par .t { background: #ffa; }
+
+@media (prefers-color-scheme: dark) { #source p.par.show_par .t { background: #650; } }
+
+#source p.par.show_par .t:hover { background: #f2f2a2; }
+
+@media (prefers-color-scheme: dark) { #source p.par.show_par .t:hover { background: #6d5d0c; } }
+
+#source p .r { position: absolute; top: 0; right: 2.5em; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; }
+
+#source p .annotate { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; color: #666; padding-right: .5em; }
+
+@media (prefers-color-scheme: dark) { #source p .annotate { color: #ddd; } }
+
+#source p .annotate.short:hover ~ .long { display: block; }
+
+#source p .annotate.long { width: 30em; right: 2.5em; }
+
+#source p input { display: none; }
+
+#source p input ~ .r label.ctx { cursor: pointer; border-radius: .25em; }
+
+#source p input ~ .r label.ctx::before { content: "▶ "; }
+
+#source p input ~ .r label.ctx:hover { background: #d5f7ff; color: #666; }
+
+@media (prefers-color-scheme: dark) { #source p input ~ .r label.ctx:hover { background: #0f3a42; } }
+
+@media (prefers-color-scheme: dark) { #source p input ~ .r label.ctx:hover { color: #aaa; } }
+
+#source p input:checked ~ .r label.ctx { background: #aef; color: #666; border-radius: .75em .75em 0 0; padding: 0 .5em; margin: -.25em 0; }
+
+@media (prefers-color-scheme: dark) { #source p input:checked ~ .r label.ctx { background: #056; } }
+
+@media (prefers-color-scheme: dark) { #source p input:checked ~ .r label.ctx { color: #aaa; } }
+
+#source p input:checked ~ .r label.ctx::before { content: "▼ "; }
+
+#source p input:checked ~ .ctxs { padding: .25em .5em; overflow-y: scroll; max-height: 10.5em; }
+
+#source p label.ctx { color: #999; display: inline-block; padding: 0 .5em; font-size: .8333em; }
+
+@media (prefers-color-scheme: dark) { #source p label.ctx { color: #777; } }
+
+#source p .ctxs { display: block; max-height: 0; overflow-y: hidden; transition: all .2s; padding: 0 .5em; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; white-space: nowrap; background: #aef; border-radius: .25em; margin-right: 1.75em; }
+
+@media (prefers-color-scheme: dark) { #source p .ctxs { background: #056; } }
+
+#source p .ctxs span { display: block; text-align: right; }
+
+#index { font-family: SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: 0.875em; }
+
+#index table.index { margin-left: -.5em; }
+
+#index td, #index th { text-align: right; width: 5em; padding: .25em .5em; border-bottom: 1px solid #eee; }
+
+@media (prefers-color-scheme: dark) { #index td, #index th { border-color: #333; } }
+
+#index td.name, #index th.name { text-align: left; width: auto; }
+
+#index th { font-style: italic; color: #333; cursor: pointer; }
+
+@media (prefers-color-scheme: dark) { #index th { color: #ddd; } }
+
+#index th:hover { background: #eee; }
+
+@media (prefers-color-scheme: dark) { #index th:hover { background: #333; } }
+
+#index th.headerSortDown, #index th.headerSortUp { white-space: nowrap; background: #eee; }
+
+@media (prefers-color-scheme: dark) { #index th.headerSortDown, #index th.headerSortUp { background: #333; } }
+
+#index th.headerSortDown:after { content: " ↑"; }
+
+#index th.headerSortUp:after { content: " ↓"; }
+
+#index td.name a { text-decoration: none; color: inherit; }
+
+#index tr.total td, #index tr.total_dynamic td { font-weight: bold; border-top: 1px solid #ccc; border-bottom: none; }
+
+#index tr.file:hover { background: #eee; }
+
+@media (prefers-color-scheme: dark) { #index tr.file:hover { background: #333; } }
+
+#index tr.file:hover td.name { text-decoration: underline; color: inherit; }
+
+#scroll_marker { position: fixed; right: 0; top: 0; width: 16px; height: 100%; background: #fff; border-left: 1px solid #eee; will-change: transform; }
+
+@media (prefers-color-scheme: dark) { #scroll_marker { background: #1e1e1e; } }
+
+@media (prefers-color-scheme: dark) { #scroll_marker { border-color: #333; } }
+
+#scroll_marker .marker { background: #ccc; position: absolute; min-height: 3px; width: 100%; }
+
+@media (prefers-color-scheme: dark) { #scroll_marker .marker { background: #444; } }
diff --git a/contrib/python/coverage/py3/coverage/htmlfiles/style.scss b/contrib/python/coverage/py3/coverage/htmlfiles/style.scss
new file mode 100644
index 0000000000..158d1fb493
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/htmlfiles/style.scss
@@ -0,0 +1,660 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt */
+
+// CSS styles for coverage.py HTML reports.
+
+// When you edit this file, you need to run "make css" to get the CSS file
+// generated, and then check in both the .scss and the .css files.
+
+// When working on the file, this command is useful:
+//      sass --watch --style=compact --sourcemap=none --no-cache coverage/htmlfiles/style.scss:htmlcov/style.css
+//
+// OR you can process sass purely in python with `pip install pysass`, then:
+//      pysassc --style=compact coverage/htmlfiles/style.scss coverage/htmlfiles/style.css
+
+// Ignore this comment, it's for the CSS output file:
+/* Don't edit this .css file. Edit the .scss file instead! */
+
+// Dimensions
+$left-gutter: 3.5rem;
+
+
+//
+// Declare colors and variables
+//
+
+$font-normal:             -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
+$font-code:               SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+
+$off-button-lighten:      50%;
+$hover-dark-amt:          95%;
+
+$focus-color:             #007acc;
+
+$mis-color:               #ff0000;
+$run-color:               #00dd00;
+$exc-color:               #808080;
+$par-color:               #dddd00;
+
+$light-bg:                #fff;
+$light-fg:                #000;
+$light-gray1:             #f8f8f8;
+$light-gray2:             #eee;
+$light-gray3:             #ccc;
+$light-gray4:             #999;
+$light-gray5:             #666;
+$light-gray6:             #333;
+$light-pln-bg:            $light-bg;
+$light-mis-bg:            #fdd;
+$light-run-bg:            #dfd;
+$light-exc-bg:            $light-gray2;
+$light-par-bg:            #ffa;
+$light-token-com:         #008000;
+$light-token-str:         #0451A5;
+$light-context-bg-color:  #aef;
+
+$dark-bg:                 #1e1e1e;
+$dark-fg:                 #eee;
+$dark-gray1:              #222;
+$dark-gray2:              #333;
+$dark-gray3:              #444;
+$dark-gray4:              #777;
+$dark-gray5:              #aaa;
+$dark-gray6:              #ddd;
+$dark-pln-bg:             $dark-bg;
+$dark-mis-bg:             #4b1818;
+$dark-run-bg:             #373d29;
+$dark-exc-bg:             $dark-gray2;
+$dark-par-bg:             #650;
+$dark-token-com:          #6A9955;
+$dark-token-str:          #9CDCFE;
+$dark-context-bg-color:   #056;
+
+//
+// Mixins and utilities
+//
+@mixin background-dark($color) {
+    @media (prefers-color-scheme: dark) {
+        background: $color;
+    }
+}
+@mixin color-dark($color) {
+    @media (prefers-color-scheme: dark) {
+        color: $color;
+    }
+}
+@mixin border-color-dark($color) {
+    @media (prefers-color-scheme: dark) {
+        border-color: $color;
+    }
+}
+
+// Add visual outline to navigable elements on focus improve accessibility.
+@mixin focus-border {
+    &:active, &:focus {
+        outline: 2px dashed $focus-color;
+    }
+}
+
+// Page-wide styles
+html, body, h1, h2, h3, p, table, td, th {
+    margin: 0;
+    padding: 0;
+    border: 0;
+    font-weight: inherit;
+    font-style: inherit;
+    font-size: 100%;
+    font-family: inherit;
+    vertical-align: baseline;
+}
+
+// Set baseline grid to 16 pt.
+body {
+    font-family: $font-normal;
+    font-size: 1em;
+    background: $light-bg;
+    color: $light-fg;
+    @include background-dark($dark-bg);
+    @include color-dark($dark-fg);
+}
+
+html>body {
+    font-size: 16px;
+}
+
+a {
+    @include focus-border;
+}
+
+p {
+    font-size: .875em;
+    line-height: 1.4em;
+}
+
+table {
+    border-collapse: collapse;
+}
+td {
+    vertical-align: top;
+}
+table tr.hidden {
+    display: none !important;
+}
+
+p#no_rows {
+    display: none;
+    font-size: 1.2em;
+}
+
+a.nav {
+    text-decoration: none;
+    color: inherit;
+
+    &:hover {
+        text-decoration: underline;
+        color: inherit;
+    }
+}
+
+// Page structure
+#header {
+    background: $light-gray1;
+    @include background-dark(black);
+    width: 100%;
+    border-bottom: 1px solid $light-gray2;
+    @include border-color-dark($dark-gray2);
+}
+
+.indexfile #footer {
+    margin: 1rem $left-gutter;
+}
+
+.pyfile #footer {
+    margin: 1rem 1rem;
+}
+
+#footer .content {
+    padding: 0;
+    color: $light-gray5;
+    @include color-dark($dark-gray5);
+    font-style: italic;
+}
+
+#index {
+    margin: 1rem 0 0 $left-gutter;
+}
+
+// Header styles
+#header .content {
+    padding: 1rem $left-gutter;
+}
+
+h1 {
+    font-size: 1.25em;
+    display: inline-block;
+}
+
+#filter_container {
+    float: right;
+    margin: 0 2em 0 0;
+
+    input {
+        width: 10em;
+        padding: 0.2em 0.5em;
+        border: 2px solid $light-gray3;
+        background: $light-bg;
+        color: $light-fg;
+        @include border-color-dark($dark-gray3);
+        @include background-dark($dark-bg);
+        @include color-dark($dark-fg);
+        &:focus {
+            border-color: $focus-color;
+        }
+    }
+}
+
+h2.stats {
+    margin-top: .5em;
+    font-size: 1em;
+}
+.stats button {
+    font-family: inherit;
+    font-size: inherit;
+    border: 1px solid;
+    border-radius: .2em;
+    color: inherit;
+    padding: .1em .5em;
+    margin: 1px calc(.1em + 1px);
+    cursor: pointer;
+    border-color: $light-gray3;
+    @include border-color-dark($dark-gray3);
+    @include focus-border;
+
+    @include focus-border;
+
+    &.run {
+        background: mix($light-run-bg, $light-bg, $off-button-lighten);
+        @include background-dark($dark-run-bg);
+        &.show_run {
+            background: $light-run-bg;
+            @include background-dark($dark-run-bg);
+            border: 2px solid $run-color;
+            margin: 0 .1em;
+        }
+    }
+    &.mis {
+        background: mix($light-mis-bg, $light-bg, $off-button-lighten);
+        @include background-dark($dark-mis-bg);
+        &.show_mis {
+            background: $light-mis-bg;
+            @include background-dark($dark-mis-bg);
+            border: 2px solid $mis-color;
+            margin: 0 .1em;
+        }
+    }
+    &.exc {
+        background: mix($light-exc-bg, $light-bg, $off-button-lighten);
+        @include background-dark($dark-exc-bg);
+        &.show_exc {
+            background: $light-exc-bg;
+            @include background-dark($dark-exc-bg);
+            border: 2px solid $exc-color;
+            margin: 0 .1em;
+        }
+    }
+    &.par {
+        background: mix($light-par-bg, $light-bg, $off-button-lighten);
+        @include background-dark($dark-par-bg);
+        &.show_par {
+            background: $light-par-bg;
+            @include background-dark($dark-par-bg);
+            border: 2px solid $par-color;
+            margin: 0 .1em;
+        }
+    }
+}
+
+// Yellow post-it things.
+%popup {
+    display: none;
+    position: absolute;
+    z-index: 999;
+    background: #ffffcc;
+    border: 1px solid #888;
+    border-radius: .2em;
+    color: #333;
+    padding: .25em .5em;
+}
+
+// Yellow post-it's in the text listings.
+%in-text-popup {
+    @extend %popup;
+    white-space: normal;
+    float: right;
+    top: 1.75em;
+    right: 1em;
+    height: auto;
+}
+
+// Help panel
+#keyboard_icon {
+    float: right;
+    margin: 5px;
+    cursor: pointer;
+}
+
+.help_panel {
+    @extend %popup;
+    padding: .5em;
+    border: 1px solid #883;
+
+    .legend {
+        font-style: italic;
+        margin-bottom: 1em;
+    }
+
+    .indexfile & {
+        width: 20em;
+        min-height: 4em;
+    }
+
+    .pyfile & {
+        width: 16em;
+        min-height: 8em;
+    }
+}
+
+#panel_icon {
+    float: right;
+    cursor: pointer;
+}
+
+.keyhelp {
+    margin: .75em;
+
+    .key {
+        border: 1px solid black;
+        border-color: #888 #333 #333 #888;
+        padding: .1em .35em;
+        font-family: $font-code;
+        font-weight: bold;
+        background: #eee;
+    }
+}
+
+// Source file styles
+
+// The slim bar at the left edge of the source lines, colored by coverage.
+$border-indicator-width: .2em;
+
+#source {
+    padding: 1em 0 1em $left-gutter;
+    font-family: $font-code;
+
+    p {
+        // position relative makes position:absolute pop-ups appear in the right place.
+        position: relative;
+        white-space: pre;
+
+        * {
+            box-sizing: border-box;
+        }
+
+        .n {
+            float: left;
+            text-align: right;
+            width: $left-gutter;
+            box-sizing: border-box;
+            margin-left: -$left-gutter;
+            padding-right: 1em;
+            color: $light-gray4;
+            @include color-dark($dark-gray4);
+
+            a {
+                text-decoration: none;
+                color: $light-gray4;
+                @include color-dark($dark-gray4);
+                &:hover {
+                    text-decoration: underline;
+                    color: $light-gray4;
+                    @include color-dark($dark-gray4);
+                }
+            }
+        }
+
+        &.highlight .n {
+            background: #ffdd00;
+        }
+
+        .t {
+            display: inline-block;
+            width: 100%;
+            box-sizing: border-box;
+            margin-left: -.5em;
+            padding-left: .5em - $border-indicator-width;
+            border-left: $border-indicator-width solid $light-bg;
+            @include border-color-dark($dark-bg);
+
+            &:hover {
+                background: mix($light-pln-bg, $light-fg, $hover-dark-amt);
+                @include background-dark(mix($dark-pln-bg, $dark-fg, $hover-dark-amt));
+
+                & ~ .r .annotate.long {
+                    display: block;
+                }
+            }
+
+            // Syntax coloring
+            .com {
+                color: $light-token-com;
+                @include color-dark($dark-token-com);
+                font-style: italic;
+                line-height: 1px;
+            }
+            .key {
+                font-weight: bold;
+                line-height: 1px;
+            }
+            .str {
+                color: $light-token-str;
+                @include color-dark($dark-token-str);
+            }
+        }
+
+        &.mis {
+            .t {
+                border-left: $border-indicator-width solid $mis-color;
+            }
+
+            &.show_mis .t {
+                background: $light-mis-bg;
+                @include background-dark($dark-mis-bg);
+
+                &:hover {
+                    background: mix($light-mis-bg, $light-fg, $hover-dark-amt);
+                    @include background-dark(mix($dark-mis-bg, $dark-fg, $hover-dark-amt));
+                }
+            }
+        }
+
+        &.run {
+            .t {
+                border-left: $border-indicator-width solid $run-color;
+            }
+
+            &.show_run .t {
+                background: $light-run-bg;
+                @include background-dark($dark-run-bg);
+
+                &:hover {
+                    background: mix($light-run-bg, $light-fg, $hover-dark-amt);
+                    @include background-dark(mix($dark-run-bg, $dark-fg, $hover-dark-amt));
+                }
+            }
+        }
+
+        &.exc {
+            .t {
+                border-left: $border-indicator-width solid $exc-color;
+            }
+
+            &.show_exc .t {
+                background: $light-exc-bg;
+                @include background-dark($dark-exc-bg);
+
+                &:hover {
+                    background: mix($light-exc-bg, $light-fg, $hover-dark-amt);
+                    @include background-dark(mix($dark-exc-bg, $dark-fg, $hover-dark-amt));
+                }
+            }
+        }
+
+        &.par {
+            .t {
+                border-left: $border-indicator-width solid $par-color;
+            }
+
+            &.show_par .t {
+                background: $light-par-bg;
+                @include background-dark($dark-par-bg);
+
+                &:hover {
+                    background: mix($light-par-bg, $light-fg, $hover-dark-amt);
+                    @include background-dark(mix($dark-par-bg, $dark-fg, $hover-dark-amt));
+                }
+            }
+
+        }
+
+        .r {
+            position: absolute;
+            top: 0;
+            right: 2.5em;
+            font-family: $font-normal;
+        }
+
+        .annotate {
+            font-family: $font-normal;
+            color: $light-gray5;
+            @include color-dark($dark-gray6);
+            padding-right: .5em;
+
+            &.short:hover ~ .long {
+                display: block;
+            }
+
+            &.long {
+                @extend %in-text-popup;
+                width: 30em;
+                right: 2.5em;
+            }
+        }
+
+        input {
+            display: none;
+
+            & ~ .r label.ctx {
+                cursor: pointer;
+                border-radius: .25em;
+                &::before {
+                    content: "▶ ";
+                }
+                &:hover {
+                    background: mix($light-context-bg-color, $light-bg, $off-button-lighten);
+                    @include background-dark(mix($dark-context-bg-color, $dark-bg, $off-button-lighten));
+                    color: $light-gray5;
+                    @include color-dark($dark-gray5);
+                }
+            }
+
+            &:checked ~ .r label.ctx {
+                background: $light-context-bg-color;
+                @include background-dark($dark-context-bg-color);
+                color: $light-gray5;
+                @include color-dark($dark-gray5);
+                border-radius: .75em .75em 0 0;
+                padding: 0 .5em;
+                margin: -.25em 0;
+                &::before {
+                    content: "▼ ";
+                }
+            }
+
+            &:checked ~ .ctxs {
+                padding: .25em .5em;
+                overflow-y: scroll;
+                max-height: 10.5em;
+            }
+        }
+
+        label.ctx {
+            color: $light-gray4;
+            @include color-dark($dark-gray4);
+            display: inline-block;
+            padding: 0 .5em;
+            font-size: .8333em;   // 10/12
+        }
+
+        .ctxs {
+            display: block;
+            max-height: 0;
+            overflow-y: hidden;
+            transition: all .2s;
+            padding: 0 .5em;
+            font-family: $font-normal;
+            white-space: nowrap;
+            background: $light-context-bg-color;
+            @include background-dark($dark-context-bg-color);
+            border-radius: .25em;
+            margin-right: 1.75em;
+            span {
+                display: block;
+                text-align: right;
+            }
+        }
+    }
+}
+
+
+// index styles
+#index {
+    font-family: $font-code;
+    font-size: 0.875em;
+
+    table.index {
+        margin-left: -.5em;
+    }
+    td, th {
+        text-align: right;
+        width: 5em;
+        padding: .25em .5em;
+        border-bottom: 1px solid $light-gray2;
+        @include border-color-dark($dark-gray2);
+        &.name {
+            text-align: left;
+            width: auto;
+        }
+    }
+    th {
+        font-style: italic;
+        color: $light-gray6;
+        @include color-dark($dark-gray6);
+        cursor: pointer;
+        &:hover {
+            background: $light-gray2;
+            @include background-dark($dark-gray2);
+        }
+        &.headerSortDown, &.headerSortUp {
+            white-space: nowrap;
+            background: $light-gray2;
+            @include background-dark($dark-gray2);
+        }
+        &.headerSortDown:after {
+            content: " ↑";
+        }
+        &.headerSortUp:after {
+            content: " ↓";
+        }
+    }
+    td.name a {
+        text-decoration: none;
+        color: inherit;
+    }
+
+    tr.total td,
+    tr.total_dynamic td {
+        font-weight: bold;
+        border-top: 1px solid #ccc;
+        border-bottom: none;
+    }
+    tr.file:hover {
+        background: $light-gray2;
+        @include background-dark($dark-gray2);
+        td.name {
+            text-decoration: underline;
+            color: inherit;
+        }
+    }
+}
+
+// scroll marker styles
+#scroll_marker {
+    position: fixed;
+    right: 0;
+    top: 0;
+    width: 16px;
+    height: 100%;
+    background: $light-bg;
+    border-left: 1px solid $light-gray2;
+    @include background-dark($dark-bg);
+    @include border-color-dark($dark-gray2);
+    will-change: transform; // for faster scrolling of fixed element in Chrome
+
+    .marker {
+        background: $light-gray3;
+        @include background-dark($dark-gray3);
+        position: absolute;
+        min-height: 3px;
+        width: 100%;
+    }
+}
diff --git a/contrib/python/coverage/py3/coverage/inorout.py b/contrib/python/coverage/py3/coverage/inorout.py
new file mode 100644
index 0000000000..cbc80e8fb5
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/inorout.py
@@ -0,0 +1,513 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Determining whether files are being measured/reported or not."""
+
+# For finding the stdlib
+import atexit
+import inspect
+import itertools
+import os
+import platform
+import re
+import sys
+import traceback
+
+from coverage import env
+from coverage.backward import code_object
+from coverage.disposition import FileDisposition, disposition_init
+from coverage.files import TreeMatcher, FnmatchMatcher, ModuleMatcher
+from coverage.files import prep_patterns, find_python_files, canonical_filename
+from coverage.misc import CoverageException
+from coverage.python import source_for_file, source_for_morf
+
+
+# Pypy has some unusual stuff in the "stdlib".  Consider those locations
+# when deciding where the stdlib is.  These modules are not used for anything,
+# they are modules importable from the pypy lib directories, so that we can
+# find those directories.
+_structseq = _pypy_irc_topic = None
+if env.PYPY:
+    try:
+        import _structseq
+    except ImportError:
+        pass
+
+    try:
+        import _pypy_irc_topic
+    except ImportError:
+        pass
+
+
+def canonical_path(morf, directory=False):
+    """Return the canonical path of the module or file `morf`.
+
+    If the module is a package, then return its directory. If it is a
+    module, then return its file, unless `directory` is True, in which
+    case return its enclosing directory.
+
+    """
+    morf_path = canonical_filename(source_for_morf(morf))
+    if morf_path.endswith("__init__.py") or directory:
+        morf_path = os.path.split(morf_path)[0]
+    return morf_path
+
+
+def name_for_module(filename, frame):
+    """Get the name of the module for a filename and frame.
+
+    For configurability's sake, we allow __main__ modules to be matched by
+    their importable name.
+
+    If loaded via runpy (aka -m), we can usually recover the "original"
+    full dotted module name, otherwise, we resort to interpreting the
+    file name to get the module's name.  In the case that the module name
+    can't be determined, None is returned.
+
+    """
+    module_globals = frame.f_globals if frame is not None else {}
+    if module_globals is None:          # pragma: only ironpython
+        # IronPython doesn't provide globals: https://github.com/IronLanguages/main/issues/1296
+        module_globals = {}
+
+    dunder_name = module_globals.get('__name__', None)
+
+    if isinstance(dunder_name, str) and dunder_name != '__main__':
+        # This is the usual case: an imported module.
+        return dunder_name
+
+    loader = module_globals.get('__loader__', None)
+    for attrname in ('fullname', 'name'):   # attribute renamed in py3.2
+        if hasattr(loader, attrname):
+            fullname = getattr(loader, attrname)
+        else:
+            continue
+
+        if isinstance(fullname, str) and fullname != '__main__':
+            # Module loaded via: runpy -m
+            return fullname
+
+    # Script as first argument to Python command line.
+    inspectedname = inspect.getmodulename(filename)
+    if inspectedname is not None:
+        return inspectedname
+    else:
+        return dunder_name
+
+
+def module_is_namespace(mod):
+    """Is the module object `mod` a PEP420 namespace module?"""
+    return hasattr(mod, '__path__') and getattr(mod, '__file__', None) is None
+
+
+def module_has_file(mod):
+    """Does the module object `mod` have an existing __file__ ?"""
+    mod__file__ = getattr(mod, '__file__', None)
+    if mod__file__ is None:
+        return False
+    return os.path.exists(mod__file__)
+
+
+class InOrOut(object):
+    """Machinery for determining what files to measure."""
+
+    def __init__(self, warn, debug):
+        self.warn = warn
+        self.debug = debug
+
+        # The matchers for should_trace.
+        self.source_match = None
+        self.source_pkgs_match = None
+        self.pylib_paths = self.cover_paths = None
+        self.pylib_match = self.cover_match = None
+        self.include_match = self.omit_match = None
+        self.plugins = []
+        self.disp_class = FileDisposition
+
+        # The source argument can be directories or package names.
+        self.source = []
+        self.source_pkgs = []
+        self.source_pkgs_unmatched = []
+        self.omit = self.include = None
+
+    def configure(self, config):
+        """Apply the configuration to get ready for decision-time."""
+        self.config = config
+        self.source_pkgs.extend(config.source_pkgs)
+        for src in config.source or []:
+            if os.path.isdir(src):
+                self.source.append(canonical_filename(src))
+            else:
+                self.source_pkgs.append(src)
+        self.source_pkgs_unmatched = self.source_pkgs[:]
+
+        self.omit = prep_patterns(config.run_omit)
+        if getattr(sys, 'is_standalone_binary', False):
+            # don't trace contrib
+            self.omit.append('contrib/python/*')
+            self.omit.append('contrib/libs/protobuf/*')
+            self.omit.append('library/python/pytest/*')
+        self.include = prep_patterns(config.run_include)
+
+        # The directories for files considered "installed with the interpreter".
+        self.pylib_paths = set()
+        if getattr(sys, 'is_standalone_binary', False):
+            self.pylib_paths.add('contrib/tools/python')
+            self.pylib_paths.add('contrib/tools/python3')
+        if not self.pylib_paths and not config.cover_pylib:
+            # Look at where some standard modules are located. That's the
+            # indication for "installed with the interpreter". In some
+            # environments (virtualenv, for example), these modules may be
+            # spread across a few locations. Look at all the candidate modules
+            # we've imported, and take all the different ones.
+            for m in (atexit, inspect, os, platform, _pypy_irc_topic, re, _structseq, traceback):
+                if m is not None and hasattr(m, "__file__"):
+                    self.pylib_paths.add(canonical_path(m, directory=True))
+
+            if _structseq and not hasattr(_structseq, '__file__'):
+                # PyPy 2.4 has no __file__ in the builtin modules, but the code
+                # objects still have the file names.  So dig into one to find
+                # the path to exclude.  The "filename" might be synthetic,
+                # don't be fooled by those.
+                structseq_file = code_object(_structseq.structseq_new).co_filename
+                if not structseq_file.startswith("<"):
+                    self.pylib_paths.add(canonical_path(structseq_file))
+
+        # To avoid tracing the coverage.py code itself, we skip anything
+        # located where we are.
+        if getattr(sys, 'is_standalone_binary', False):
+            self.cover_paths = ["contrib/python/coverage"]
+        else:
+            self.cover_paths = [canonical_path(__file__, directory=True)]
+        if env.TESTING:
+            # Don't include our own test code.
+            self.cover_paths.append(os.path.join(self.cover_paths[0], "tests"))
+
+            # When testing, we use PyContracts, which should be considered
+            # part of coverage.py, and it uses six. Exclude those directories
+            # just as we exclude ourselves.
+            import contracts
+            import six
+            for mod in [contracts, six]:
+                self.cover_paths.append(canonical_path(mod))
+
+        def debug(msg):
+            if self.debug:
+                self.debug.write(msg)
+
+        # Create the matchers we need for should_trace
+        if self.source or self.source_pkgs:
+            against = []
+            if self.source:
+                self.source_match = TreeMatcher(self.source)
+                against.append("trees {!r}".format(self.source_match))
+            if self.source_pkgs:
+                self.source_pkgs_match = ModuleMatcher(self.source_pkgs)
+                against.append("modules {!r}".format(self.source_pkgs_match))
+            debug("Source matching against " + " and ".join(against))
+        else:
+            if self.cover_paths:
+                self.cover_match = TreeMatcher(self.cover_paths)
+                debug("Coverage code matching: {!r}".format(self.cover_match))
+            if self.pylib_paths:
+                self.pylib_match = TreeMatcher(self.pylib_paths)
+                debug("Python stdlib matching: {!r}".format(self.pylib_match))
+        if self.include:
+            self.include_match = FnmatchMatcher(self.include)
+            debug("Include matching: {!r}".format(self.include_match))
+        if self.omit:
+            self.omit_match = FnmatchMatcher(self.omit)
+            debug("Omit matching: {!r}".format(self.omit_match))
+
+    def should_trace(self, filename, frame=None):
+        """Decide whether to trace execution in `filename`, with a reason.
+
+        This function is called from the trace function.  As each new file name
+        is encountered, this function determines whether it is traced or not.
+
+        Returns a FileDisposition object.
+
+        """
+        original_filename = filename
+        disp = disposition_init(self.disp_class, filename)
+
+        def nope(disp, reason):
+            """Simple helper to make it easy to return NO."""
+            disp.trace = False
+            disp.reason = reason
+            return disp
+
+        if frame is not None:
+            # Compiled Python files have two file names: frame.f_code.co_filename is
+            # the file name at the time the .pyc was compiled.  The second name is
+            # __file__, which is where the .pyc was actually loaded from.  Since
+            # .pyc files can be moved after compilation (for example, by being
+            # installed), we look for __file__ in the frame and prefer it to the
+            # co_filename value.
+            dunder_file = frame.f_globals and frame.f_globals.get('__file__')
+            if dunder_file:
+                filename = source_for_file(dunder_file)
+                if original_filename and not original_filename.startswith('<'):
+                    orig = os.path.basename(original_filename)
+                    if orig != os.path.basename(filename):
+                        # Files shouldn't be renamed when moved. This happens when
+                        # exec'ing code.  If it seems like something is wrong with
+                        # the frame's file name, then just use the original.
+                        filename = original_filename
+
+        if not filename:
+            # Empty string is pretty useless.
+            return nope(disp, "empty string isn't a file name")
+
+        if filename.startswith('memory:'):
+            return nope(disp, "memory isn't traceable")
+
+        if filename.startswith('<'):
+            # Lots of non-file execution is represented with artificial
+            # file names like "<string>", "<doctest readme.txt[0]>", or
+            # "<exec_function>".  Don't ever trace these executions, since we
+            # can't do anything with the data later anyway.
+            return nope(disp, "not a real file name")
+
+        # pyexpat does a dumb thing, calling the trace function explicitly from
+        # C code with a C file name.
+        if re.search(r"[/\\]Modules[/\\]pyexpat.c", filename):
+            return nope(disp, "pyexpat lies about itself")
+
+        # Jython reports the .class file to the tracer, use the source file.
+        if filename.endswith("$py.class"):
+            filename = filename[:-9] + ".py"
+
+        # XXX maybe we need to support both at the same time?
+        # Don't trace modules imported from environment in standalone mode
+        if getattr(sys, 'is_standalone_binary', False) and filename.startswith("/"):
+            return nope(disp, "skip modules from environment")
+
+        canonical = canonical_filename(filename)
+        disp.canonical_filename = canonical
+
+        # Try the plugins, see if they have an opinion about the file.
+        plugin = None
+        for plugin in self.plugins.file_tracers:
+            if not plugin._coverage_enabled:
+                continue
+
+            try:
+                file_tracer = plugin.file_tracer(canonical)
+                if file_tracer is not None:
+                    file_tracer._coverage_plugin = plugin
+                    disp.trace = True
+                    disp.file_tracer = file_tracer
+                    if file_tracer.has_dynamic_source_filename():
+                        disp.has_dynamic_filename = True
+                    else:
+                        disp.source_filename = canonical_filename(
+                            file_tracer.source_filename()
+                        )
+                    break
+            except Exception:
+                if not self.config.suppress_plugin_errors:
+                    raise
+                self.warn(
+                    "Disabling plug-in %r due to an exception:" % (plugin._coverage_plugin_name)
+                )
+                traceback.print_exc()
+                plugin._coverage_enabled = False
+                continue
+        else:
+            # No plugin wanted it: it's Python.
+            disp.trace = True
+            disp.source_filename = canonical
+
+        if not disp.has_dynamic_filename:
+            if not disp.source_filename:
+                raise CoverageException(
+                    "Plugin %r didn't set source_filename for %r" %
+                    (plugin, disp.original_filename)
+                )
+            reason = self.check_include_omit_etc(disp.source_filename, frame)
+            if reason:
+                nope(disp, reason)
+
+        return disp
+
+    def check_include_omit_etc(self, filename, frame):
+        """Check a file name against the include, omit, etc, rules.
+
+        Returns a string or None.  String means, don't trace, and is the reason
+        why.  None means no reason found to not trace.
+
+        """
+        modulename = name_for_module(filename, frame)
+
+        # If the user specified source or include, then that's authoritative
+        # about the outer bound of what to measure and we don't have to apply
+        # any canned exclusions. If they didn't, then we have to exclude the
+        # stdlib and coverage.py directories.
+        if self.source_match or self.source_pkgs_match:
+            extra = ""
+            ok = False
+            if self.source_pkgs_match:
+                if self.source_pkgs_match.match(modulename):
+                    ok = True
+                    if modulename in self.source_pkgs_unmatched:
+                        self.source_pkgs_unmatched.remove(modulename)
+                else:
+                    extra = "module {!r} ".format(modulename)
+            if not ok and self.source_match:
+                if self.source_match.match(filename):
+                    ok = True
+            if not ok:
+                return extra + "falls outside the --source spec"
+        elif self.include_match:
+            if not self.include_match.match(filename):
+                return "falls outside the --include trees"
+        else:
+            # If we aren't supposed to trace installed code, then check if this
+            # is near the Python standard library and skip it if so.
+            if self.pylib_match and self.pylib_match.match(filename):
+                return "is in the stdlib"
+
+            # We exclude the coverage.py code itself, since a little of it
+            # will be measured otherwise.
+            if self.cover_match and self.cover_match.match(filename):
+                return "is part of coverage.py"
+
+        # Check the file against the omit pattern.
+        if self.omit_match and self.omit_match.match(filename):
+            return "is inside an --omit pattern"
+
+        # No point tracing a file we can't later write to SQLite.
+        try:
+            filename.encode("utf8")
+        except UnicodeEncodeError:
+            return "non-encodable filename"
+
+        # No reason found to skip this file.
+        return None
+
+    def warn_conflicting_settings(self):
+        """Warn if there are settings that conflict."""
+        if self.include:
+            if self.source or self.source_pkgs:
+                self.warn("--include is ignored because --source is set", slug="include-ignored")
+
+    def warn_already_imported_files(self):
+        """Warn if files have already been imported that we will be measuring."""
+        if self.include or self.source or self.source_pkgs:
+            warned = set()
+            for mod in list(sys.modules.values()):
+                filename = getattr(mod, "__file__", None)
+                if filename is None:
+                    continue
+                if filename in warned:
+                    continue
+
+                disp = self.should_trace(filename)
+                if disp.trace:
+                    msg = "Already imported a file that will be measured: {}".format(filename)
+                    self.warn(msg, slug="already-imported")
+                    warned.add(filename)
+
+    def warn_unimported_source(self):
+        """Warn about source packages that were of interest, but never traced."""
+        for pkg in self.source_pkgs_unmatched:
+            self._warn_about_unmeasured_code(pkg)
+
+    def _warn_about_unmeasured_code(self, pkg):
+        """Warn about a package or module that we never traced.
+
+        `pkg` is a string, the name of the package or module.
+
+        """
+        mod = sys.modules.get(pkg)
+        if mod is None:
+            self.warn("Module %s was never imported." % pkg, slug="module-not-imported")
+            return
+
+        if module_is_namespace(mod):
+            # A namespace package. It's OK for this not to have been traced,
+            # since there is no code directly in it.
+            return
+
+        if not module_has_file(mod):
+            self.warn("Module %s has no Python source." % pkg, slug="module-not-python")
+            return
+
+        # The module was in sys.modules, and seems like a module with code, but
+        # we never measured it. I guess that means it was imported before
+        # coverage even started.
+        self.warn(
+            "Module %s was previously imported, but not measured" % pkg,
+            slug="module-not-measured",
+        )
+
+    def find_possibly_unexecuted_files(self):
+        """Find files in the areas of interest that might be untraced.
+
+        Yields pairs: file path, and responsible plug-in name.
+        """
+        for pkg in self.source_pkgs:
+            if (not pkg in sys.modules or
+                not module_has_file(sys.modules[pkg])):
+                continue
+            pkg_file = source_for_file(sys.modules[pkg].__file__)
+            for ret in self._find_executable_files(canonical_path(pkg_file)):
+                yield ret
+
+        for src in self.source:
+            for ret in self._find_executable_files(src):
+                yield ret
+
+    def _find_plugin_files(self, src_dir):
+        """Get executable files from the plugins."""
+        for plugin in self.plugins.file_tracers:
+            for x_file in plugin.find_executable_files(src_dir):
+                yield x_file, plugin._coverage_plugin_name
+
+    def _find_executable_files(self, src_dir):
+        """Find executable files in `src_dir`.
+
+        Search for files in `src_dir` that can be executed because they
+        are probably importable. Don't include ones that have been omitted
+        by the configuration.
+
+        Yield the file path, and the plugin name that handles the file.
+
+        """
+        py_files = ((py_file, None) for py_file in find_python_files(src_dir))
+        plugin_files = self._find_plugin_files(src_dir)
+
+        for file_path, plugin_name in itertools.chain(py_files, plugin_files):
+            file_path = canonical_filename(file_path)
+            if self.omit_match and self.omit_match.match(file_path):
+                # Turns out this file was omitted, so don't pull it back
+                # in as unexecuted.
+                continue
+            yield file_path, plugin_name
+
+    def sys_info(self):
+        """Our information for Coverage.sys_info.
+
+        Returns a list of (key, value) pairs.
+        """
+        info = [
+            ('cover_paths', self.cover_paths),
+            ('pylib_paths', self.pylib_paths),
+        ]
+
+        matcher_names = [
+            'source_match', 'source_pkgs_match',
+            'include_match', 'omit_match',
+            'cover_match', 'pylib_match',
+            ]
+
+        for matcher_name in matcher_names:
+            matcher = getattr(self, matcher_name)
+            if matcher:
+                matcher_info = matcher.info()
+            else:
+                matcher_info = '-none-'
+            info.append((matcher_name, matcher_info))
+
+        return info
diff --git a/contrib/python/coverage/py3/coverage/jsonreport.py b/contrib/python/coverage/py3/coverage/jsonreport.py
new file mode 100644
index 0000000000..4287bc79a3
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/jsonreport.py
@@ -0,0 +1,103 @@
+# coding: utf-8
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Json reporting for coverage.py"""
+import datetime
+import json
+import sys
+
+from coverage import __version__
+from coverage.report import get_analysis_to_report
+from coverage.results import Numbers
+
+
+class JsonReporter(object):
+    """A reporter for writing JSON coverage results."""
+
+    def __init__(self, coverage):
+        self.coverage = coverage
+        self.config = self.coverage.config
+        self.total = Numbers()
+        self.report_data = {}
+
+    def report(self, morfs, outfile=None):
+        """Generate a json report for `morfs`.
+
+        `morfs` is a list of modules or file names.
+
+        `outfile` is a file object to write the json to
+
+        """
+        outfile = outfile or sys.stdout
+        coverage_data = self.coverage.get_data()
+        coverage_data.set_query_contexts(self.config.report_contexts)
+        self.report_data["meta"] = {
+            "version": __version__,
+            "timestamp": datetime.datetime.now().isoformat(),
+            "branch_coverage": coverage_data.has_arcs(),
+            "show_contexts": self.config.json_show_contexts,
+        }
+
+        measured_files = {}
+        for file_reporter, analysis in get_analysis_to_report(self.coverage, morfs):
+            measured_files[file_reporter.relative_filename()] = self.report_one_file(
+                coverage_data,
+                analysis
+            )
+
+        self.report_data["files"] = measured_files
+
+        self.report_data["totals"] = {
+            'covered_lines': self.total.n_executed,
+            'num_statements': self.total.n_statements,
+            'percent_covered': self.total.pc_covered,
+            'missing_lines': self.total.n_missing,
+            'excluded_lines': self.total.n_excluded,
+        }
+
+        if coverage_data.has_arcs():
+            self.report_data["totals"].update({
+                'num_branches': self.total.n_branches,
+                'num_partial_branches': self.total.n_partial_branches,
+                'covered_branches': self.total.n_executed_branches,
+                'missing_branches': self.total.n_missing_branches,
+            })
+
+        json.dump(
+            self.report_data,
+            outfile,
+            indent=4 if self.config.json_pretty_print else None
+        )
+
+        return self.total.n_statements and self.total.pc_covered
+
+    def report_one_file(self, coverage_data, analysis):
+        """Extract the relevant report data for a single file"""
+        nums = analysis.numbers
+        self.total += nums
+        summary = {
+            'covered_lines': nums.n_executed,
+            'num_statements': nums.n_statements,
+            'percent_covered': nums.pc_covered,
+            'missing_lines': nums.n_missing,
+            'excluded_lines': nums.n_excluded,
+        }
+        reported_file = {
+            'executed_lines': sorted(analysis.executed),
+            'summary': summary,
+            'missing_lines': sorted(analysis.missing),
+            'excluded_lines': sorted(analysis.excluded)
+        }
+        if self.config.json_show_contexts:
+            reported_file['contexts'] = analysis.data.contexts_by_lineno(
+                analysis.filename,
+            )
+        if coverage_data.has_arcs():
+            reported_file['summary'].update({
+                'num_branches': nums.n_branches,
+                'num_partial_branches': nums.n_partial_branches,
+                'covered_branches': nums.n_executed_branches,
+                'missing_branches': nums.n_missing_branches,
+            })
+        return reported_file
diff --git a/contrib/python/coverage/py3/coverage/misc.py b/contrib/python/coverage/py3/coverage/misc.py
new file mode 100644
index 0000000000..034e288eb9
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/misc.py
@@ -0,0 +1,361 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Miscellaneous stuff for coverage.py."""
+
+import errno
+import hashlib
+import inspect
+import locale
+import os
+import os.path
+import random
+import re
+import socket
+import sys
+import types
+
+from coverage import env
+from coverage.backward import to_bytes, unicode_class
+
+ISOLATED_MODULES = {}
+
+
+def isolate_module(mod):
+    """Copy a module so that we are isolated from aggressive mocking.
+
+    If a test suite mocks os.path.exists (for example), and then we need to use
+    it during the test, everything will get tangled up if we use their mock.
+    Making a copy of the module when we import it will isolate coverage.py from
+    those complications.
+    """
+    if mod not in ISOLATED_MODULES:
+        new_mod = types.ModuleType(mod.__name__)
+        ISOLATED_MODULES[mod] = new_mod
+        for name in dir(mod):
+            value = getattr(mod, name)
+            if isinstance(value, types.ModuleType):
+                value = isolate_module(value)
+            setattr(new_mod, name, value)
+    return ISOLATED_MODULES[mod]
+
+os = isolate_module(os)
+
+
+def dummy_decorator_with_args(*args_unused, **kwargs_unused):
+    """Dummy no-op implementation of a decorator with arguments."""
+    def _decorator(func):
+        return func
+    return _decorator
+
+
+# Environment COVERAGE_NO_CONTRACTS=1 can turn off contracts while debugging
+# tests to remove noise from stack traces.
+# $set_env.py: COVERAGE_NO_CONTRACTS - Disable PyContracts to simplify stack traces.
+USE_CONTRACTS = env.TESTING and not bool(int(os.environ.get("COVERAGE_NO_CONTRACTS", 0)))
+
+# Use PyContracts for assertion testing on parameters and returns, but only if
+# we are running our own test suite.
+if USE_CONTRACTS:
+    from contracts import contract              # pylint: disable=unused-import
+    from contracts import new_contract as raw_new_contract
+
+    def new_contract(*args, **kwargs):
+        """A proxy for contracts.new_contract that doesn't mind happening twice."""
+        try:
+            raw_new_contract(*args, **kwargs)
+        except ValueError:
+            # During meta-coverage, this module is imported twice, and
+            # PyContracts doesn't like redefining contracts. It's OK.
+            pass
+
+    # Define contract words that PyContract doesn't have.
+    new_contract('bytes', lambda v: isinstance(v, bytes))
+    if env.PY3:
+        new_contract('unicode', lambda v: isinstance(v, unicode_class))
+
+    def one_of(argnames):
+        """Ensure that only one of the argnames is non-None."""
+        def _decorator(func):
+            argnameset = {name.strip() for name in argnames.split(",")}
+            def _wrapper(*args, **kwargs):
+                vals = [kwargs.get(name) for name in argnameset]
+                assert sum(val is not None for val in vals) == 1
+                return func(*args, **kwargs)
+            return _wrapper
+        return _decorator
+else:                                           # pragma: not testing
+    # We aren't using real PyContracts, so just define our decorators as
+    # stunt-double no-ops.
+    contract = dummy_decorator_with_args
+    one_of = dummy_decorator_with_args
+
+    def new_contract(*args_unused, **kwargs_unused):
+        """Dummy no-op implementation of `new_contract`."""
+        pass
+
+
+def nice_pair(pair):
+    """Make a nice string representation of a pair of numbers.
+
+    If the numbers are equal, just return the number, otherwise return the pair
+    with a dash between them, indicating the range.
+
+    """
+    start, end = pair
+    if start == end:
+        return "%d" % start
+    else:
+        return "%d-%d" % (start, end)
+
+
+def expensive(fn):
+    """A decorator to indicate that a method shouldn't be called more than once.
+
+    Normally, this does nothing.  During testing, this raises an exception if
+    called more than once.
+
+    """
+    if env.TESTING:
+        attr = "_once_" + fn.__name__
+
+        def _wrapper(self):
+            if hasattr(self, attr):
+                raise AssertionError("Shouldn't have called %s more than once" % fn.__name__)
+            setattr(self, attr, True)
+            return fn(self)
+        return _wrapper
+    else:
+        return fn                   # pragma: not testing
+
+
+def bool_or_none(b):
+    """Return bool(b), but preserve None."""
+    if b is None:
+        return None
+    else:
+        return bool(b)
+
+
+def join_regex(regexes):
+    """Combine a list of regexes into one that matches any of them."""
+    return "|".join("(?:%s)" % r for r in regexes)
+
+
+def file_be_gone(path):
+    """Remove a file, and don't get annoyed if it doesn't exist."""
+    try:
+        os.remove(path)
+    except OSError as e:
+        if e.errno != errno.ENOENT:
+            raise
+
+
+def ensure_dir(directory):
+    """Make sure the directory exists.
+
+    If `directory` is None or empty, do nothing.
+    """
+    if directory and not os.path.isdir(directory):
+        os.makedirs(directory)
+
+
+def ensure_dir_for_file(path):
+    """Make sure the directory for the path exists."""
+    ensure_dir(os.path.dirname(path))
+
+
+def output_encoding(outfile=None):
+    """Determine the encoding to use for output written to `outfile` or stdout."""
+    if outfile is None:
+        outfile = sys.stdout
+    encoding = (
+        getattr(outfile, "encoding", None) or
+        getattr(sys.__stdout__, "encoding", None) or
+        locale.getpreferredencoding()
+    )
+    return encoding
+
+
+def filename_suffix(suffix):
+    """Compute a filename suffix for a data file.
+
+    If `suffix` is a string or None, simply return it. If `suffix` is True,
+    then build a suffix incorporating the hostname, process id, and a random
+    number.
+
+    Returns a string or None.
+
+    """
+    if suffix is True:
+        # If data_suffix was a simple true value, then make a suffix with
+        # plenty of distinguishing information.  We do this here in
+        # `save()` at the last minute so that the pid will be correct even
+        # if the process forks.
+        dice = random.Random(os.urandom(8)).randint(0, 999999)
+        suffix = "%s.%s.%06d" % (socket.gethostname(), os.getpid(), dice)
+    return suffix
+
+
+class Hasher(object):
+    """Hashes Python data into md5."""
+    def __init__(self):
+        self.md5 = hashlib.md5()
+
+    def update(self, v):
+        """Add `v` to the hash, recursively if needed."""
+        self.md5.update(to_bytes(str(type(v))))
+        if isinstance(v, unicode_class):
+            self.md5.update(v.encode('utf8'))
+        elif isinstance(v, bytes):
+            self.md5.update(v)
+        elif v is None:
+            pass
+        elif isinstance(v, (int, float)):
+            self.md5.update(to_bytes(str(v)))
+        elif isinstance(v, (tuple, list)):
+            for e in v:
+                self.update(e)
+        elif isinstance(v, dict):
+            keys = v.keys()
+            for k in sorted(keys):
+                self.update(k)
+                self.update(v[k])
+        else:
+            for k in dir(v):
+                if k.startswith('__'):
+                    continue
+                a = getattr(v, k)
+                if inspect.isroutine(a):
+                    continue
+                self.update(k)
+                self.update(a)
+        self.md5.update(b'.')
+
+    def hexdigest(self):
+        """Retrieve the hex digest of the hash."""
+        return self.md5.hexdigest()
+
+
+def _needs_to_implement(that, func_name):
+    """Helper to raise NotImplementedError in interface stubs."""
+    if hasattr(that, "_coverage_plugin_name"):
+        thing = "Plugin"
+        name = that._coverage_plugin_name
+    else:
+        thing = "Class"
+        klass = that.__class__
+        name = "{klass.__module__}.{klass.__name__}".format(klass=klass)
+
+    raise NotImplementedError(
+        "{thing} {name!r} needs to implement {func_name}()".format(
+            thing=thing, name=name, func_name=func_name
+            )
+        )
+
+
+class DefaultValue(object):
+    """A sentinel object to use for unusual default-value needs.
+
+    Construct with a string that will be used as the repr, for display in help
+    and Sphinx output.
+
+    """
+    def __init__(self, display_as):
+        self.display_as = display_as
+
+    def __repr__(self):
+        return self.display_as
+
+
+def substitute_variables(text, variables):
+    """Substitute ``${VAR}`` variables in `text` with their values.
+
+    Variables in the text can take a number of shell-inspired forms::
+
+        $VAR
+        ${VAR}
+        ${VAR?}             strict: an error if VAR isn't defined.
+        ${VAR-missing}      defaulted: "missing" if VAR isn't defined.
+        $$                  just a dollar sign.
+
+    `variables` is a dictionary of variable values.
+
+    Returns the resulting text with values substituted.
+
+    """
+    dollar_pattern = r"""(?x)   # Use extended regex syntax
+        \$                      # A dollar sign,
+        (?:                     # then
+            (?P<dollar>\$) |        # a dollar sign, or
+            (?P<word1>\w+) |        # a plain word, or
+            {                       # a {-wrapped
+                (?P<word2>\w+)          # word,
+                (?:
+                    (?P<strict>\?) |        # with a strict marker
+                    -(?P<defval>[^}]*)      # or a default value
+                )?                      # maybe.
+            }
+        )
+        """
+
+    def dollar_replace(match):
+        """Called for each $replacement."""
+        # Only one of the groups will have matched, just get its text.
+        word = next(g for g in match.group('dollar', 'word1', 'word2') if g)
+        if word == "$":
+            return "$"
+        elif word in variables:
+            return variables[word]
+        elif match.group('strict'):
+            msg = "Variable {} is undefined: {!r}".format(word, text)
+            raise CoverageException(msg)
+        else:
+            return match.group('defval')
+
+    text = re.sub(dollar_pattern, dollar_replace, text)
+    return text
+
+
+class BaseCoverageException(Exception):
+    """The base of all Coverage exceptions."""
+    pass
+
+
+class CoverageException(BaseCoverageException):
+    """An exception raised by a coverage.py function."""
+    pass
+
+
+class NoSource(CoverageException):
+    """We couldn't find the source for a module."""
+    pass
+
+
+class NoCode(NoSource):
+    """We couldn't find any code at all."""
+    pass
+
+
+class NotPython(CoverageException):
+    """A source file turned out not to be parsable Python."""
+    pass
+
+
+class ExceptionDuringRun(CoverageException):
+    """An exception happened while running customer code.
+
+    Construct it with three arguments, the values from `sys.exc_info`.
+
+    """
+    pass
+
+
+class StopEverything(BaseCoverageException):
+    """An exception that means everything should stop.
+
+    The CoverageTest class converts these to SkipTest, so that when running
+    tests, raising this exception will automatically skip the test.
+
+    """
+    pass
diff --git a/contrib/python/coverage/py3/coverage/multiproc.py b/contrib/python/coverage/py3/coverage/multiproc.py
new file mode 100644
index 0000000000..21ed2e2c95
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/multiproc.py
@@ -0,0 +1,117 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Monkey-patching to add multiprocessing support for coverage.py"""
+
+import multiprocessing
+import multiprocessing.process
+import os
+import os.path
+import sys
+import traceback
+
+from coverage import env
+from coverage.misc import contract
+
+# An attribute that will be set on the module to indicate that it has been
+# monkey-patched.
+PATCHED_MARKER = "_coverage$patched"
+
+COVERAGE_CONFIGURATION_ENV = "_COVERAGE_CONFIGURATION_ENV"
+
+
+if env.PYVERSION >= (3, 4):
+    OriginalProcess = multiprocessing.process.BaseProcess
+else:
+    OriginalProcess = multiprocessing.Process
+
+original_bootstrap = OriginalProcess._bootstrap
+
+class ProcessWithCoverage(OriginalProcess):         # pylint: disable=abstract-method
+    """A replacement for multiprocess.Process that starts coverage."""
+
+    def _bootstrap(self, *args, **kwargs):
+        """Wrapper around _bootstrap to start coverage."""
+        try:
+            from coverage import Coverage       # avoid circular import
+            import json
+            kwconf = json.loads(os.environ[COVERAGE_CONFIGURATION_ENV])
+            cov = Coverage(**kwconf)
+            cov._warn_preimported_source = False
+            cov.start()
+            debug = cov._debug
+            if debug.should("multiproc"):
+                debug.write("Calling multiprocessing bootstrap")
+        except Exception:
+            print("Exception during multiprocessing bootstrap init:")
+            traceback.print_exc(file=sys.stdout)
+            sys.stdout.flush()
+            raise
+        try:
+            return original_bootstrap(self, *args, **kwargs)
+        finally:
+            if debug.should("multiproc"):
+                debug.write("Finished multiprocessing bootstrap")
+            cov.stop()
+            cov.save()
+            if debug.should("multiproc"):
+                debug.write("Saved multiprocessing data")
+
+class Stowaway(object):
+    """An object to pickle, so when it is unpickled, it can apply the monkey-patch."""
+    def __init__(self, rcfile):
+        self.rcfile = rcfile
+
+    def __getstate__(self):
+        return {'rcfile': self.rcfile}
+
+    def __setstate__(self, state):
+        patch_multiprocessing(state['rcfile'])
+
+
+@contract(rcfile=str)
+def patch_multiprocessing(rcfile, coverage_args):
+    """Monkey-patch the multiprocessing module.
+
+    This enables coverage measurement of processes started by multiprocessing.
+    This involves aggressive monkey-patching.
+
+    `rcfile` is the path to the rcfile being used.
+
+    """
+
+    if hasattr(multiprocessing, PATCHED_MARKER):
+        return
+
+    if env.PYVERSION >= (3, 4):
+        OriginalProcess._bootstrap = ProcessWithCoverage._bootstrap
+    else:
+        multiprocessing.Process = ProcessWithCoverage
+
+    # Set the value in ProcessWithCoverage that will be pickled into the child
+    # process.
+    os.environ["COVERAGE_RCFILE"] = os.path.abspath(rcfile)
+
+    os.environ[COVERAGE_CONFIGURATION_ENV] = coverage_args
+
+    # When spawning processes rather than forking them, we have no state in the
+    # new process.  We sneak in there with a Stowaway: we stuff one of our own
+    # objects into the data that gets pickled and sent to the sub-process. When
+    # the Stowaway is unpickled, it's __setstate__ method is called, which
+    # re-applies the monkey-patch.
+    # Windows only spawns, so this is needed to keep Windows working.
+    try:
+        from multiprocessing import spawn
+        original_get_preparation_data = spawn.get_preparation_data
+    except (ImportError, AttributeError):
+        pass
+    else:
+        def get_preparation_data_with_stowaway(name):
+            """Get the original preparation data, and also insert our stowaway."""
+            d = original_get_preparation_data(name)
+            d['stowaway'] = Stowaway(rcfile)
+            return d
+
+        spawn.get_preparation_data = get_preparation_data_with_stowaway
+
+    setattr(multiprocessing, PATCHED_MARKER, True)
diff --git a/contrib/python/coverage/py3/coverage/numbits.py b/contrib/python/coverage/py3/coverage/numbits.py
new file mode 100644
index 0000000000..6ca96fbcf7
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/numbits.py
@@ -0,0 +1,163 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""
+Functions to manipulate packed binary representations of number sets.
+
+To save space, coverage stores sets of line numbers in SQLite using a packed
+binary representation called a numbits.  A numbits is a set of positive
+integers.
+
+A numbits is stored as a blob in the database.  The exact meaning of the bytes
+in the blobs should be considered an implementation detail that might change in
+the future.  Use these functions to work with those binary blobs of data.
+
+"""
+import json
+
+from coverage import env
+from coverage.backward import byte_to_int, bytes_to_ints, binary_bytes, zip_longest
+from coverage.misc import contract, new_contract
+
+if env.PY3:
+    def _to_blob(b):
+        """Convert a bytestring into a type SQLite will accept for a blob."""
+        return b
+
+    new_contract('blob', lambda v: isinstance(v, bytes))
+else:
+    def _to_blob(b):
+        """Convert a bytestring into a type SQLite will accept for a blob."""
+        return buffer(b)                                    # pylint: disable=undefined-variable
+
+    new_contract('blob', lambda v: isinstance(v, buffer))   # pylint: disable=undefined-variable
+
+
+@contract(nums='Iterable', returns='blob')
+def nums_to_numbits(nums):
+    """Convert `nums` into a numbits.
+
+    Arguments:
+        nums: a reusable iterable of integers, the line numbers to store.
+
+    Returns:
+        A binary blob.
+    """
+    try:
+        nbytes = max(nums) // 8 + 1
+    except ValueError:
+        # nums was empty.
+        return _to_blob(b'')
+    b = bytearray(nbytes)
+    for num in nums:
+        b[num//8] |= 1 << num % 8
+    return _to_blob(bytes(b))
+
+
+@contract(numbits='blob', returns='list[int]')
+def numbits_to_nums(numbits):
+    """Convert a numbits into a list of numbers.
+
+    Arguments:
+        numbits: a binary blob, the packed number set.
+
+    Returns:
+        A list of ints.
+
+    When registered as a SQLite function by :func:`register_sqlite_functions`,
+    this returns a string, a JSON-encoded list of ints.
+
+    """
+    nums = []
+    for byte_i, byte in enumerate(bytes_to_ints(numbits)):
+        for bit_i in range(8):
+            if (byte & (1 << bit_i)):
+                nums.append(byte_i * 8 + bit_i)
+    return nums
+
+
+@contract(numbits1='blob', numbits2='blob', returns='blob')
+def numbits_union(numbits1, numbits2):
+    """Compute the union of two numbits.
+
+    Returns:
+        A new numbits, the union of `numbits1` and `numbits2`.
+    """
+    byte_pairs = zip_longest(bytes_to_ints(numbits1), bytes_to_ints(numbits2), fillvalue=0)
+    return _to_blob(binary_bytes(b1 | b2 for b1, b2 in byte_pairs))
+
+
+@contract(numbits1='blob', numbits2='blob', returns='blob')
+def numbits_intersection(numbits1, numbits2):
+    """Compute the intersection of two numbits.
+
+    Returns:
+        A new numbits, the intersection `numbits1` and `numbits2`.
+    """
+    byte_pairs = zip_longest(bytes_to_ints(numbits1), bytes_to_ints(numbits2), fillvalue=0)
+    intersection_bytes = binary_bytes(b1 & b2 for b1, b2 in byte_pairs)
+    return _to_blob(intersection_bytes.rstrip(b'\0'))
+
+
+@contract(numbits1='blob', numbits2='blob', returns='bool')
+def numbits_any_intersection(numbits1, numbits2):
+    """Is there any number that appears in both numbits?
+
+    Determine whether two number sets have a non-empty intersection. This is
+    faster than computing the intersection.
+
+    Returns:
+        A bool, True if there is any number in both `numbits1` and `numbits2`.
+    """
+    byte_pairs = zip_longest(bytes_to_ints(numbits1), bytes_to_ints(numbits2), fillvalue=0)
+    return any(b1 & b2 for b1, b2 in byte_pairs)
+
+
+@contract(num='int', numbits='blob', returns='bool')
+def num_in_numbits(num, numbits):
+    """Does the integer `num` appear in `numbits`?
+
+    Returns:
+        A bool, True if `num` is a member of `numbits`.
+    """
+    nbyte, nbit = divmod(num, 8)
+    if nbyte >= len(numbits):
+        return False
+    return bool(byte_to_int(numbits[nbyte]) & (1 << nbit))
+
+
+def register_sqlite_functions(connection):
+    """
+    Define numbits functions in a SQLite connection.
+
+    This defines these functions for use in SQLite statements:
+
+    * :func:`numbits_union`
+    * :func:`numbits_intersection`
+    * :func:`numbits_any_intersection`
+    * :func:`num_in_numbits`
+    * :func:`numbits_to_nums`
+
+    `connection` is a :class:`sqlite3.Connection <python:sqlite3.Connection>`
+    object.  After creating the connection, pass it to this function to
+    register the numbits functions.  Then you can use numbits functions in your
+    queries::
+
+        import sqlite3
+        from coverage.numbits import register_sqlite_functions
+
+        conn = sqlite3.connect('example.db')
+        register_sqlite_functions(conn)
+        c = conn.cursor()
+        # Kind of a nonsense query: find all the files and contexts that
+        # executed line 47 in any file:
+        c.execute(
+            "select file_id, context_id from line_bits where num_in_numbits(?, numbits)",
+            (47,)
+        )
+    """
+    connection.create_function("numbits_union", 2, numbits_union)
+    connection.create_function("numbits_intersection", 2, numbits_intersection)
+    connection.create_function("numbits_any_intersection", 2, numbits_any_intersection)
+    connection.create_function("num_in_numbits", 2, num_in_numbits)
+    connection.create_function("numbits_to_nums", 1, lambda b: json.dumps(numbits_to_nums(b)))
diff --git a/contrib/python/coverage/py3/coverage/parser.py b/contrib/python/coverage/py3/coverage/parser.py
new file mode 100644
index 0000000000..258f956039
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/parser.py
@@ -0,0 +1,1276 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Code parsing for coverage.py."""
+
+import ast
+import collections
+import os
+import re
+import token
+import tokenize
+
+from coverage import env
+from coverage.backward import range    # pylint: disable=redefined-builtin
+from coverage.backward import bytes_to_ints, string_class
+from coverage.bytecode import code_objects
+from coverage.debug import short_stack
+from coverage.misc import contract, join_regex, new_contract, nice_pair, one_of
+from coverage.misc import NoSource, NotPython, StopEverything
+from coverage.phystokens import compile_unicode, generate_tokens, neuter_encoding_declaration
+
+
+class PythonParser(object):
+    """Parse code to find executable lines, excluded lines, etc.
+
+    This information is all based on static analysis: no code execution is
+    involved.
+
+    """
+    @contract(text='unicode|None')
+    def __init__(self, text=None, filename=None, exclude=None):
+        """
+        Source can be provided as `text`, the text itself, or `filename`, from
+        which the text will be read.  Excluded lines are those that match
+        `exclude`, a regex.
+
+        """
+        assert text or filename, "PythonParser needs either text or filename"
+        self.filename = filename or "<code>"
+        self.text = text
+        if not self.text:
+            from coverage.python import get_python_source
+            try:
+                self.text = get_python_source(self.filename)
+            except IOError as err:
+                raise NoSource(
+                    "No source for code: '%s': %s" % (self.filename, err)
+                )
+
+        self.exclude = exclude
+
+        # The text lines of the parsed code.
+        self.lines = self.text.split('\n')
+
+        # The normalized line numbers of the statements in the code. Exclusions
+        # are taken into account, and statements are adjusted to their first
+        # lines.
+        self.statements = set()
+
+        # The normalized line numbers of the excluded lines in the code,
+        # adjusted to their first lines.
+        self.excluded = set()
+
+        # The raw_* attributes are only used in this class, and in
+        # lab/parser.py to show how this class is working.
+
+        # The line numbers that start statements, as reported by the line
+        # number table in the bytecode.
+        self.raw_statements = set()
+
+        # The raw line numbers of excluded lines of code, as marked by pragmas.
+        self.raw_excluded = set()
+
+        # The line numbers of class definitions.
+        self.raw_classdefs = set()
+
+        # Function definitions (start, end, name)
+        self._raw_funcdefs = set()
+
+        # The line numbers of docstring lines.
+        self.raw_docstrings = set()
+
+        # Internal detail, used by lab/parser.py.
+        self.show_tokens = False
+
+        # A dict mapping line numbers to lexical statement starts for
+        # multi-line statements.
+        self._multiline = {}
+
+        # Lazily-created ByteParser, arc data, and missing arc descriptions.
+        self._byte_parser = None
+        self._all_arcs = None
+        self._missing_arc_fragments = None
+
+    @property
+    def byte_parser(self):
+        """Create a ByteParser on demand."""
+        if not self._byte_parser:
+            self._byte_parser = ByteParser(self.text, filename=self.filename)
+        return self._byte_parser
+
+    @property
+    def raw_funcdefs(self):
+        return self._raw_funcdefs
+
+    def lines_matching(self, *regexes):
+        """Find the lines matching one of a list of regexes.
+
+        Returns a set of line numbers, the lines that contain a match for one
+        of the regexes in `regexes`.  The entire line needn't match, just a
+        part of it.
+
+        """
+        combined = join_regex(regexes)
+        if env.PY2:
+            combined = combined.decode("utf8")
+        regex_c = re.compile(combined)
+        matches = set()
+        for i, ltext in enumerate(self.lines, start=1):
+            if regex_c.search(ltext):
+                matches.add(i)
+        return matches
+
+    def _raw_parse(self):
+        """Parse the source to find the interesting facts about its lines.
+
+        A handful of attributes are updated.
+
+        """
+        # Find lines which match an exclusion pattern.
+        if self.exclude:
+            self.raw_excluded = self.lines_matching(self.exclude)
+
+        # Tokenize, to find excluded suites, to find docstrings, and to find
+        # multi-line statements.
+        indent = 0
+        exclude_indent = 0
+        excluding = False
+        excluding_decorators = False
+        prev_toktype = token.INDENT
+        first_line = None
+        empty = True
+        first_on_line = True
+
+        tokgen = generate_tokens(self.text)
+        for toktype, ttext, (slineno, _), (elineno, _), ltext in tokgen:
+            if self.show_tokens:                # pragma: debugging
+                print("%10s %5s %-20r %r" % (
+                    tokenize.tok_name.get(toktype, toktype),
+                    nice_pair((slineno, elineno)), ttext, ltext
+                ))
+            if toktype == token.INDENT:
+                indent += 1
+            elif toktype == token.DEDENT:
+                indent -= 1
+            elif toktype == token.NAME:
+                if ttext == 'class':
+                    # Class definitions look like branches in the bytecode, so
+                    # we need to exclude them.  The simplest way is to note the
+                    # lines with the 'class' keyword.
+                    self.raw_classdefs.add(slineno)
+            elif toktype == token.OP:
+                if ttext == ':':
+                    should_exclude = (elineno in self.raw_excluded) or excluding_decorators
+                    if not excluding and should_exclude:
+                        # Start excluding a suite.  We trigger off of the colon
+                        # token so that the #pragma comment will be recognized on
+                        # the same line as the colon.
+                        self.raw_excluded.add(elineno)
+                        exclude_indent = indent
+                        excluding = True
+                        excluding_decorators = False
+                elif ttext == '@' and first_on_line:
+                    # A decorator.
+                    if elineno in self.raw_excluded:
+                        excluding_decorators = True
+                    if excluding_decorators:
+                        self.raw_excluded.add(elineno)
+            elif toktype == token.STRING and prev_toktype == token.INDENT:
+                # Strings that are first on an indented line are docstrings.
+                # (a trick from trace.py in the stdlib.) This works for
+                # 99.9999% of cases.  For the rest (!) see:
+                # http://stackoverflow.com/questions/1769332/x/1769794#1769794
+                self.raw_docstrings.update(range(slineno, elineno+1))
+            elif toktype == token.NEWLINE:
+                if first_line is not None and elineno != first_line:
+                    # We're at the end of a line, and we've ended on a
+                    # different line than the first line of the statement,
+                    # so record a multi-line range.
+                    for l in range(first_line, elineno+1):
+                        self._multiline[l] = first_line
+                first_line = None
+                first_on_line = True
+
+            if ttext.strip() and toktype != tokenize.COMMENT:
+                # A non-whitespace token.
+                empty = False
+                if first_line is None:
+                    # The token is not whitespace, and is the first in a
+                    # statement.
+                    first_line = slineno
+                    # Check whether to end an excluded suite.
+                    if excluding and indent <= exclude_indent:
+                        excluding = False
+                    if excluding:
+                        self.raw_excluded.add(elineno)
+                    first_on_line = False
+
+            prev_toktype = toktype
+
+        # Find the starts of the executable statements.
+        if not empty:
+            self.raw_statements.update(self.byte_parser._find_statements())
+
+        # The first line of modules can lie and say 1 always, even if the first
+        # line of code is later. If so, map 1 to the actual first line of the
+        # module.
+        if env.PYBEHAVIOR.module_firstline_1 and self._multiline:
+            self._multiline[1] = min(self.raw_statements)
+
+    def first_line(self, line):
+        """Return the first line number of the statement including `line`."""
+        if line < 0:
+            line = -self._multiline.get(-line, -line)
+        else:
+            line = self._multiline.get(line, line)
+        return line
+
+    def first_lines(self, lines):
+        """Map the line numbers in `lines` to the correct first line of the
+        statement.
+
+        Returns a set of the first lines.
+
+        """
+        return {self.first_line(l) for l in lines}
+
+    def translate_lines(self, lines):
+        """Implement `FileReporter.translate_lines`."""
+        return self.first_lines(lines)
+
+    def translate_arcs(self, arcs):
+        """Implement `FileReporter.translate_arcs`."""
+        return [(self.first_line(a), self.first_line(b)) for (a, b) in arcs]
+
+    def parse_source(self):
+        """Parse source text to find executable lines, excluded lines, etc.
+
+        Sets the .excluded and .statements attributes, normalized to the first
+        line of multi-line statements.
+
+        """
+        try:
+            self._raw_parse()
+        except (tokenize.TokenError, IndentationError) as err:
+            if hasattr(err, "lineno"):
+                lineno = err.lineno         # IndentationError
+            else:
+                lineno = err.args[1][0]     # TokenError
+            raise NotPython(
+                u"Couldn't parse '%s' as Python source: '%s' at line %d" % (
+                    self.filename, err.args[0], lineno
+                )
+            )
+
+        self.excluded = self.first_lines(self.raw_excluded)
+
+        ignore = self.excluded | self.raw_docstrings
+        starts = self.raw_statements - ignore
+        self.statements = self.first_lines(starts) - ignore
+
+    def arcs(self):
+        """Get information about the arcs available in the code.
+
+        Returns a set of line number pairs.  Line numbers have been normalized
+        to the first line of multi-line statements.
+
+        """
+        if self._all_arcs is None:
+            self._analyze_ast()
+        return self._all_arcs
+
+    def _analyze_ast(self):
+        """Run the AstArcAnalyzer and save its results.
+
+        `_all_arcs` is the set of arcs in the code.
+
+        """
+        aaa = AstArcAnalyzer(self.text, self.raw_statements, self._multiline)
+        aaa.analyze()
+
+        self._all_arcs = set()
+        for l1, l2 in aaa.arcs:
+            fl1 = self.first_line(l1)
+            fl2 = self.first_line(l2)
+            if fl1 != fl2:
+                self._all_arcs.add((fl1, fl2))
+
+        self._missing_arc_fragments = aaa.missing_arc_fragments
+        self._raw_funcdefs = aaa.funcdefs
+
+    def exit_counts(self):
+        """Get a count of exits from that each line.
+
+        Excluded lines are excluded.
+
+        """
+        exit_counts = collections.defaultdict(int)
+        for l1, l2 in self.arcs():
+            if l1 < 0:
+                # Don't ever report -1 as a line number
+                continue
+            if l1 in self.excluded:
+                # Don't report excluded lines as line numbers.
+                continue
+            if l2 in self.excluded:
+                # Arcs to excluded lines shouldn't count.
+                continue
+            exit_counts[l1] += 1
+
+        # Class definitions have one extra exit, so remove one for each:
+        for l in self.raw_classdefs:
+            # Ensure key is there: class definitions can include excluded lines.
+            if l in exit_counts:
+                exit_counts[l] -= 1
+
+        return exit_counts
+
+    def missing_arc_description(self, start, end, executed_arcs=None):
+        """Provide an English sentence describing a missing arc."""
+        if self._missing_arc_fragments is None:
+            self._analyze_ast()
+
+        actual_start = start
+
+        if (
+            executed_arcs and
+            end < 0 and end == -start and
+            (end, start) not in executed_arcs and
+            (end, start) in self._missing_arc_fragments
+        ):
+            # It's a one-line callable, and we never even started it,
+            # and we have a message about not starting it.
+            start, end = end, start
+
+        fragment_pairs = self._missing_arc_fragments.get((start, end), [(None, None)])
+
+        msgs = []
+        for smsg, emsg in fragment_pairs:
+            if emsg is None:
+                if end < 0:
+                    # Hmm, maybe we have a one-line callable, let's check.
+                    if (-end, end) in self._missing_arc_fragments:
+                        return self.missing_arc_description(-end, end)
+                    emsg = "didn't jump to the function exit"
+                else:
+                    emsg = "didn't jump to line {lineno}"
+            emsg = emsg.format(lineno=end)
+
+            msg = "line {start} {emsg}".format(start=actual_start, emsg=emsg)
+            if smsg is not None:
+                msg += ", because {smsg}".format(smsg=smsg.format(lineno=actual_start))
+
+            msgs.append(msg)
+
+        return " or ".join(msgs)
+
+
+class ByteParser(object):
+    """Parse bytecode to understand the structure of code."""
+
+    @contract(text='unicode')
+    def __init__(self, text, code=None, filename=None):
+        self.text = text
+        if code:
+            self.code = code
+        else:
+            try:
+                self.code = compile_unicode(text, filename, "exec")
+            except SyntaxError as synerr:
+                raise NotPython(
+                    u"Couldn't parse '%s' as Python source: '%s' at line %d" % (
+                        filename, synerr.msg, synerr.lineno
+                    )
+                )
+
+        # Alternative Python implementations don't always provide all the
+        # attributes on code objects that we need to do the analysis.
+        for attr in ['co_lnotab', 'co_firstlineno']:
+            if not hasattr(self.code, attr):
+                raise StopEverything(                   # pragma: only jython
+                    "This implementation of Python doesn't support code analysis.\n"
+                    "Run coverage.py under another Python for this command."
+                )
+
+    def child_parsers(self):
+        """Iterate over all the code objects nested within this one.
+
+        The iteration includes `self` as its first value.
+
+        """
+        return (ByteParser(self.text, code=c) for c in code_objects(self.code))
+
+    def _line_numbers(self):
+        """Yield the line numbers possible in this code object.
+
+        Uses co_lnotab described in Python/compile.c to find the
+        line numbers.  Produces a sequence: l0, l1, ...
+        """
+        if hasattr(self.code, "co_lines"):
+            for _, _, line in self.code.co_lines():
+                if line is not None:
+                    yield line
+        else:
+            # Adapted from dis.py in the standard library.
+            byte_increments = bytes_to_ints(self.code.co_lnotab[0::2])
+            line_increments = bytes_to_ints(self.code.co_lnotab[1::2])
+
+            last_line_num = None
+            line_num = self.code.co_firstlineno
+            byte_num = 0
+            for byte_incr, line_incr in zip(byte_increments, line_increments):
+                if byte_incr:
+                    if line_num != last_line_num:
+                        yield line_num
+                        last_line_num = line_num
+                    byte_num += byte_incr
+                if env.PYBEHAVIOR.negative_lnotab and line_incr >= 0x80:
+                    line_incr -= 0x100
+                line_num += line_incr
+            if line_num != last_line_num:
+                yield line_num
+
+    def _find_statements(self):
+        """Find the statements in `self.code`.
+
+        Produce a sequence of line numbers that start statements.  Recurses
+        into all code objects reachable from `self.code`.
+
+        """
+        for bp in self.child_parsers():
+            # Get all of the lineno information from this code.
+            for l in bp._line_numbers():
+                yield l
+
+
+#
+# AST analysis
+#
+
+class LoopBlock(object):
+    """A block on the block stack representing a `for` or `while` loop."""
+    @contract(start=int)
+    def __init__(self, start):
+        # The line number where the loop starts.
+        self.start = start
+        # A set of ArcStarts, the arcs from break statements exiting this loop.
+        self.break_exits = set()
+
+
+class FunctionBlock(object):
+    """A block on the block stack representing a function definition."""
+    @contract(start=int, name=str)
+    def __init__(self, start, name):
+        # The line number where the function starts.
+        self.start = start
+        # The name of the function.
+        self.name = name
+
+
+class TryBlock(object):
+    """A block on the block stack representing a `try` block."""
+    @contract(handler_start='int|None', final_start='int|None')
+    def __init__(self, handler_start, final_start):
+        # The line number of the first "except" handler, if any.
+        self.handler_start = handler_start
+        # The line number of the "finally:" clause, if any.
+        self.final_start = final_start
+
+        # The ArcStarts for breaks/continues/returns/raises inside the "try:"
+        # that need to route through the "finally:" clause.
+        self.break_from = set()
+        self.continue_from = set()
+        self.return_from = set()
+        self.raise_from = set()
+
+
+class ArcStart(collections.namedtuple("Arc", "lineno, cause")):
+    """The information needed to start an arc.
+
+    `lineno` is the line number the arc starts from.
+
+    `cause` is an English text fragment used as the `startmsg` for
+    AstArcAnalyzer.missing_arc_fragments.  It will be used to describe why an
+    arc wasn't executed, so should fit well into a sentence of the form,
+    "Line 17 didn't run because {cause}."  The fragment can include "{lineno}"
+    to have `lineno` interpolated into it.
+
+    """
+    def __new__(cls, lineno, cause=None):
+        return super(ArcStart, cls).__new__(cls, lineno, cause)
+
+
+# Define contract words that PyContract doesn't have.
+# ArcStarts is for a list or set of ArcStart's.
+new_contract('ArcStarts', lambda seq: all(isinstance(x, ArcStart) for x in seq))
+
+
+# Turn on AST dumps with an environment variable.
+# $set_env.py: COVERAGE_AST_DUMP - Dump the AST nodes when parsing code.
+AST_DUMP = bool(int(os.environ.get("COVERAGE_AST_DUMP", 0)))
+
+class NodeList(object):
+    """A synthetic fictitious node, containing a sequence of nodes.
+
+    This is used when collapsing optimized if-statements, to represent the
+    unconditional execution of one of the clauses.
+
+    """
+    def __init__(self, body):
+        self.body = body
+        self.lineno = body[0].lineno
+
+
+# TODO: some add_arcs methods here don't add arcs, they return them. Rename them.
+# TODO: the cause messages have too many commas.
+# TODO: Shouldn't the cause messages join with "and" instead of "or"?
+
+class AstArcAnalyzer(object):
+    """Analyze source text with an AST to find executable code paths."""
+
+    @contract(text='unicode', statements=set)
+    def __init__(self, text, statements, multiline):
+        self.root_node = ast.parse(neuter_encoding_declaration(text))
+        # TODO: I think this is happening in too many places.
+        self.statements = {multiline.get(l, l) for l in statements}
+        self.multiline = multiline
+
+        if AST_DUMP:                                # pragma: debugging
+            # Dump the AST so that failing tests have helpful output.
+            print("Statements: {}".format(self.statements))
+            print("Multiline map: {}".format(self.multiline))
+            ast_dump(self.root_node)
+
+        self.arcs = set()
+
+        # A map from arc pairs to a list of pairs of sentence fragments:
+        #   { (start, end): [(startmsg, endmsg), ...], }
+        #
+        # For an arc from line 17, they should be usable like:
+        #    "Line 17 {endmsg}, because {startmsg}"
+        self.missing_arc_fragments = collections.defaultdict(list)
+        self.block_stack = []
+        self.funcdefs = set()
+
+        # $set_env.py: COVERAGE_TRACK_ARCS - Trace every arc added while parsing code.
+        self.debug = bool(int(os.environ.get("COVERAGE_TRACK_ARCS", 0)))
+
+    def analyze(self):
+        """Examine the AST tree from `root_node` to determine possible arcs.
+
+        This sets the `arcs` attribute to be a set of (from, to) line number
+        pairs.
+
+        """
+        for node in ast.walk(self.root_node):
+            node_name = node.__class__.__name__
+            code_object_handler = getattr(self, "_code_object__" + node_name, None)
+            if code_object_handler is not None:
+                code_object_handler(node)
+
+    @contract(start=int, end=int)
+    def add_arc(self, start, end, smsg=None, emsg=None):
+        """Add an arc, including message fragments to use if it is missing."""
+        if self.debug:                      # pragma: debugging
+            print("\nAdding arc: ({}, {}): {!r}, {!r}".format(start, end, smsg, emsg))
+            print(short_stack(limit=6))
+        self.arcs.add((start, end))
+
+        if smsg is not None or emsg is not None:
+            self.missing_arc_fragments[(start, end)].append((smsg, emsg))
+
+    def nearest_blocks(self):
+        """Yield the blocks in nearest-to-farthest order."""
+        return reversed(self.block_stack)
+
+    @contract(returns=int)
+    def line_for_node(self, node):
+        """What is the right line number to use for this node?
+
+        This dispatches to _line__Node functions where needed.
+
+        """
+        node_name = node.__class__.__name__
+        handler = getattr(self, "_line__" + node_name, None)
+        if handler is not None:
+            return handler(node)
+        else:
+            return node.lineno
+
+    def _line_decorated(self, node):
+        """Compute first line number for things that can be decorated (classes and functions)."""
+        lineno = node.lineno
+        if env.PYBEHAVIOR.trace_decorated_def:
+            if node.decorator_list:
+                lineno = node.decorator_list[0].lineno
+        return lineno
+
+    def _line__Assign(self, node):
+        return self.line_for_node(node.value)
+
+    _line__ClassDef = _line_decorated
+
+    def _line__Dict(self, node):
+        # Python 3.5 changed how dict literals are made.
+        if env.PYVERSION >= (3, 5) and node.keys:
+            if node.keys[0] is not None:
+                return node.keys[0].lineno
+            else:
+                # Unpacked dict literals `{**{'a':1}}` have None as the key,
+                # use the value in that case.
+                return node.values[0].lineno
+        else:
+            return node.lineno
+
+    _line__FunctionDef = _line_decorated
+    _line__AsyncFunctionDef = _line_decorated
+
+    def _line__List(self, node):
+        if node.elts:
+            return self.line_for_node(node.elts[0])
+        else:
+            return node.lineno
+
+    def _line__Module(self, node):
+        if env.PYBEHAVIOR.module_firstline_1:
+            return 1
+        elif node.body:
+            return self.line_for_node(node.body[0])
+        else:
+            # Empty modules have no line number, they always start at 1.
+            return 1
+
+    # The node types that just flow to the next node with no complications.
+    OK_TO_DEFAULT = {
+        "Assign", "Assert", "AugAssign", "Delete", "Exec", "Expr", "Global",
+        "Import", "ImportFrom", "Nonlocal", "Pass", "Print",
+    }
+
+    @contract(returns='ArcStarts')
+    def add_arcs(self, node):
+        """Add the arcs for `node`.
+
+        Return a set of ArcStarts, exits from this node to the next. Because a
+        node represents an entire sub-tree (including its children), the exits
+        from a node can be arbitrarily complex::
+
+            if something(1):
+                if other(2):
+                    doit(3)
+                else:
+                    doit(5)
+
+        There are two exits from line 1: they start at line 3 and line 5.
+
+        """
+        node_name = node.__class__.__name__
+        handler = getattr(self, "_handle__" + node_name, None)
+        if handler is not None:
+            return handler(node)
+        else:
+            # No handler: either it's something that's ok to default (a simple
+            # statement), or it's something we overlooked. Change this 0 to 1
+            # to see if it's overlooked.
+            if 0:
+                if node_name not in self.OK_TO_DEFAULT:
+                    print("*** Unhandled: {}".format(node))
+
+            # Default for simple statements: one exit from this node.
+            return {ArcStart(self.line_for_node(node))}
+
+    @one_of("from_start, prev_starts")
+    @contract(returns='ArcStarts')
+    def add_body_arcs(self, body, from_start=None, prev_starts=None):
+        """Add arcs for the body of a compound statement.
+
+        `body` is the body node.  `from_start` is a single `ArcStart` that can
+        be the previous line in flow before this body.  `prev_starts` is a set
+        of ArcStarts that can be the previous line.  Only one of them should be
+        given.
+
+        Returns a set of ArcStarts, the exits from this body.
+
+        """
+        if prev_starts is None:
+            prev_starts = {from_start}
+        for body_node in body:
+            lineno = self.line_for_node(body_node)
+            first_line = self.multiline.get(lineno, lineno)
+            if first_line not in self.statements:
+                body_node = self.find_non_missing_node(body_node)
+                if body_node is None:
+                    continue
+                lineno = self.line_for_node(body_node)
+            for prev_start in prev_starts:
+                self.add_arc(prev_start.lineno, lineno, prev_start.cause)
+            prev_starts = self.add_arcs(body_node)
+        return prev_starts
+
+    def find_non_missing_node(self, node):
+        """Search `node` looking for a child that has not been optimized away.
+
+        This might return the node you started with, or it will work recursively
+        to find a child node in self.statements.
+
+        Returns a node, or None if none of the node remains.
+
+        """
+        # This repeats work just done in add_body_arcs, but this duplication
+        # means we can avoid a function call in the 99.9999% case of not
+        # optimizing away statements.
+        lineno = self.line_for_node(node)
+        first_line = self.multiline.get(lineno, lineno)
+        if first_line in self.statements:
+            return node
+
+        missing_fn = getattr(self, "_missing__" + node.__class__.__name__, None)
+        if missing_fn:
+            node = missing_fn(node)
+        else:
+            node = None
+        return node
+
+    # Missing nodes: _missing__*
+    #
+    # Entire statements can be optimized away by Python. They will appear in
+    # the AST, but not the bytecode.  These functions are called (by
+    # find_non_missing_node) to find a node to use instead of the missing
+    # node.  They can return None if the node should truly be gone.
+
+    def _missing__If(self, node):
+        # If the if-node is missing, then one of its children might still be
+        # here, but not both. So return the first of the two that isn't missing.
+        # Use a NodeList to hold the clauses as a single node.
+        non_missing = self.find_non_missing_node(NodeList(node.body))
+        if non_missing:
+            return non_missing
+        if node.orelse:
+            return self.find_non_missing_node(NodeList(node.orelse))
+        return None
+
+    def _missing__NodeList(self, node):
+        # A NodeList might be a mixture of missing and present nodes. Find the
+        # ones that are present.
+        non_missing_children = []
+        for child in node.body:
+            child = self.find_non_missing_node(child)
+            if child is not None:
+                non_missing_children.append(child)
+
+        # Return the simplest representation of the present children.
+        if not non_missing_children:
+            return None
+        if len(non_missing_children) == 1:
+            return non_missing_children[0]
+        return NodeList(non_missing_children)
+
+    def _missing__While(self, node):
+        body_nodes = self.find_non_missing_node(NodeList(node.body))
+        if not body_nodes:
+            return None
+        # Make a synthetic While-true node.
+        new_while = ast.While()
+        new_while.lineno = body_nodes.lineno
+        new_while.test = ast.Name()
+        new_while.test.lineno = body_nodes.lineno
+        new_while.test.id = "True"
+        new_while.body = body_nodes.body
+        new_while.orelse = None
+        return new_while
+
+    def is_constant_expr(self, node):
+        """Is this a compile-time constant?"""
+        node_name = node.__class__.__name__
+        if node_name in ["Constant", "NameConstant", "Num"]:
+            return "Num"
+        elif node_name == "Name":
+            if node.id in ["True", "False", "None", "__debug__"]:
+                return "Name"
+        return None
+
+    # In the fullness of time, these might be good tests to write:
+    #   while EXPR:
+    #   while False:
+    #   listcomps hidden deep in other expressions
+    #   listcomps hidden in lists: x = [[i for i in range(10)]]
+    #   nested function definitions
+
+
+    # Exit processing: process_*_exits
+    #
+    # These functions process the four kinds of jump exits: break, continue,
+    # raise, and return.  To figure out where an exit goes, we have to look at
+    # the block stack context.  For example, a break will jump to the nearest
+    # enclosing loop block, or the nearest enclosing finally block, whichever
+    # is nearer.
+
+    @contract(exits='ArcStarts')
+    def process_break_exits(self, exits):
+        """Add arcs due to jumps from `exits` being breaks."""
+        for block in self.nearest_blocks():
+            if isinstance(block, LoopBlock):
+                block.break_exits.update(exits)
+                break
+            elif isinstance(block, TryBlock) and block.final_start is not None:
+                block.break_from.update(exits)
+                break
+
+    @contract(exits='ArcStarts')
+    def process_continue_exits(self, exits):
+        """Add arcs due to jumps from `exits` being continues."""
+        for block in self.nearest_blocks():
+            if isinstance(block, LoopBlock):
+                for xit in exits:
+                    self.add_arc(xit.lineno, block.start, xit.cause)
+                break
+            elif isinstance(block, TryBlock) and block.final_start is not None:
+                block.continue_from.update(exits)
+                break
+
+    @contract(exits='ArcStarts')
+    def process_raise_exits(self, exits):
+        """Add arcs due to jumps from `exits` being raises."""
+        for block in self.nearest_blocks():
+            if isinstance(block, TryBlock):
+                if block.handler_start is not None:
+                    for xit in exits:
+                        self.add_arc(xit.lineno, block.handler_start, xit.cause)
+                    break
+                elif block.final_start is not None:
+                    block.raise_from.update(exits)
+                    break
+            elif isinstance(block, FunctionBlock):
+                for xit in exits:
+                    self.add_arc(
+                        xit.lineno, -block.start, xit.cause,
+                        "didn't except from function {!r}".format(block.name),
+                    )
+                break
+
+    @contract(exits='ArcStarts')
+    def process_return_exits(self, exits):
+        """Add arcs due to jumps from `exits` being returns."""
+        for block in self.nearest_blocks():
+            if isinstance(block, TryBlock) and block.final_start is not None:
+                block.return_from.update(exits)
+                break
+            elif isinstance(block, FunctionBlock):
+                for xit in exits:
+                    self.add_arc(
+                        xit.lineno, -block.start, xit.cause,
+                        "didn't return from function {!r}".format(block.name),
+                    )
+                break
+
+
+    # Handlers: _handle__*
+    #
+    # Each handler deals with a specific AST node type, dispatched from
+    # add_arcs.  Handlers return the set of exits from that node, and can
+    # also call self.add_arc to record arcs they find.  These functions mirror
+    # the Python semantics of each syntactic construct.  See the docstring
+    # for add_arcs to understand the concept of exits from a node.
+
+    @contract(returns='ArcStarts')
+    def _handle__Break(self, node):
+        here = self.line_for_node(node)
+        break_start = ArcStart(here, cause="the break on line {lineno} wasn't executed")
+        self.process_break_exits([break_start])
+        return set()
+
+    @contract(returns='ArcStarts')
+    def _handle_decorated(self, node):
+        """Add arcs for things that can be decorated (classes and functions)."""
+        main_line = last = node.lineno
+        if node.decorator_list:
+            if env.PYBEHAVIOR.trace_decorated_def:
+                last = None
+            for dec_node in node.decorator_list:
+                dec_start = self.line_for_node(dec_node)
+                if last is not None and dec_start != last:
+                    self.add_arc(last, dec_start)
+                last = dec_start
+            if env.PYBEHAVIOR.trace_decorated_def:
+                self.add_arc(last, main_line)
+                last = main_line
+            # The definition line may have been missed, but we should have it
+            # in `self.statements`.  For some constructs, `line_for_node` is
+            # not what we'd think of as the first line in the statement, so map
+            # it to the first one.
+            if node.body:
+                body_start = self.line_for_node(node.body[0])
+                body_start = self.multiline.get(body_start, body_start)
+                for lineno in range(last+1, body_start):
+                    if lineno in self.statements:
+                        self.add_arc(last, lineno)
+                        last = lineno
+        # The body is handled in collect_arcs.
+        return {ArcStart(last)}
+
+    _handle__ClassDef = _handle_decorated
+
+    @contract(returns='ArcStarts')
+    def _handle__Continue(self, node):
+        here = self.line_for_node(node)
+        continue_start = ArcStart(here, cause="the continue on line {lineno} wasn't executed")
+        self.process_continue_exits([continue_start])
+        return set()
+
+    @contract(returns='ArcStarts')
+    def _handle__For(self, node):
+        start = self.line_for_node(node.iter)
+        self.block_stack.append(LoopBlock(start=start))
+        from_start = ArcStart(start, cause="the loop on line {lineno} never started")
+        exits = self.add_body_arcs(node.body, from_start=from_start)
+        # Any exit from the body will go back to the top of the loop.
+        for xit in exits:
+            self.add_arc(xit.lineno, start, xit.cause)
+        my_block = self.block_stack.pop()
+        exits = my_block.break_exits
+        from_start = ArcStart(start, cause="the loop on line {lineno} didn't complete")
+        if node.orelse:
+            else_exits = self.add_body_arcs(node.orelse, from_start=from_start)
+            exits |= else_exits
+        else:
+            # No else clause: exit from the for line.
+            exits.add(from_start)
+        return exits
+
+    _handle__AsyncFor = _handle__For
+
+    _handle__FunctionDef = _handle_decorated
+    _handle__AsyncFunctionDef = _handle_decorated
+
+    @contract(returns='ArcStarts')
+    def _handle__If(self, node):
+        start = self.line_for_node(node.test)
+        from_start = ArcStart(start, cause="the condition on line {lineno} was never true")
+        exits = self.add_body_arcs(node.body, from_start=from_start)
+        from_start = ArcStart(start, cause="the condition on line {lineno} was never false")
+        exits |= self.add_body_arcs(node.orelse, from_start=from_start)
+        return exits
+
+    @contract(returns='ArcStarts')
+    def _handle__NodeList(self, node):
+        start = self.line_for_node(node)
+        exits = self.add_body_arcs(node.body, from_start=ArcStart(start))
+        return exits
+
+    @contract(returns='ArcStarts')
+    def _handle__Raise(self, node):
+        here = self.line_for_node(node)
+        raise_start = ArcStart(here, cause="the raise on line {lineno} wasn't executed")
+        self.process_raise_exits([raise_start])
+        # `raise` statement jumps away, no exits from here.
+        return set()
+
+    @contract(returns='ArcStarts')
+    def _handle__Return(self, node):
+        here = self.line_for_node(node)
+        return_start = ArcStart(here, cause="the return on line {lineno} wasn't executed")
+        self.process_return_exits([return_start])
+        # `return` statement jumps away, no exits from here.
+        return set()
+
+    @contract(returns='ArcStarts')
+    def _handle__Try(self, node):
+        if node.handlers:
+            handler_start = self.line_for_node(node.handlers[0])
+        else:
+            handler_start = None
+
+        if node.finalbody:
+            final_start = self.line_for_node(node.finalbody[0])
+        else:
+            final_start = None
+
+        try_block = TryBlock(handler_start, final_start)
+        self.block_stack.append(try_block)
+
+        start = self.line_for_node(node)
+        exits = self.add_body_arcs(node.body, from_start=ArcStart(start))
+
+        # We're done with the `try` body, so this block no longer handles
+        # exceptions. We keep the block so the `finally` clause can pick up
+        # flows from the handlers and `else` clause.
+        if node.finalbody:
+            try_block.handler_start = None
+            if node.handlers:
+                # If there are `except` clauses, then raises in the try body
+                # will already jump to them.  Start this set over for raises in
+                # `except` and `else`.
+                try_block.raise_from = set()
+        else:
+            self.block_stack.pop()
+
+        handler_exits = set()
+
+        if node.handlers:
+            last_handler_start = None
+            for handler_node in node.handlers:
+                handler_start = self.line_for_node(handler_node)
+                if last_handler_start is not None:
+                    self.add_arc(last_handler_start, handler_start)
+                last_handler_start = handler_start
+                from_cause = "the exception caught by line {lineno} didn't happen"
+                from_start = ArcStart(handler_start, cause=from_cause)
+                handler_exits |= self.add_body_arcs(handler_node.body, from_start=from_start)
+
+        if node.orelse:
+            exits = self.add_body_arcs(node.orelse, prev_starts=exits)
+
+        exits |= handler_exits
+
+        if node.finalbody:
+            self.block_stack.pop()
+            final_from = (                  # You can get to the `finally` clause from:
+                exits |                         # the exits of the body or `else` clause,
+                try_block.break_from |          # or a `break`,
+                try_block.continue_from |       # or a `continue`,
+                try_block.raise_from |          # or a `raise`,
+                try_block.return_from           # or a `return`.
+            )
+
+            final_exits = self.add_body_arcs(node.finalbody, prev_starts=final_from)
+
+            if try_block.break_from:
+                if env.PYBEHAVIOR.finally_jumps_back:
+                    for break_line in try_block.break_from:
+                        lineno = break_line.lineno
+                        cause = break_line.cause.format(lineno=lineno)
+                        for final_exit in final_exits:
+                            self.add_arc(final_exit.lineno, lineno, cause)
+                    breaks = try_block.break_from
+                else:
+                    breaks = self._combine_finally_starts(try_block.break_from, final_exits)
+                self.process_break_exits(breaks)
+
+            if try_block.continue_from:
+                if env.PYBEHAVIOR.finally_jumps_back:
+                    for continue_line in try_block.continue_from:
+                        lineno = continue_line.lineno
+                        cause = continue_line.cause.format(lineno=lineno)
+                        for final_exit in final_exits:
+                            self.add_arc(final_exit.lineno, lineno, cause)
+                    continues = try_block.continue_from
+                else:
+                    continues = self._combine_finally_starts(try_block.continue_from, final_exits)
+                self.process_continue_exits(continues)
+
+            if try_block.raise_from:
+                self.process_raise_exits(
+                    self._combine_finally_starts(try_block.raise_from, final_exits)
+                )
+
+            if try_block.return_from:
+                if env.PYBEHAVIOR.finally_jumps_back:
+                    for return_line in try_block.return_from:
+                        lineno = return_line.lineno
+                        cause = return_line.cause.format(lineno=lineno)
+                        for final_exit in final_exits:
+                            self.add_arc(final_exit.lineno, lineno, cause)
+                    returns = try_block.return_from
+                else:
+                    returns = self._combine_finally_starts(try_block.return_from, final_exits)
+                self.process_return_exits(returns)
+
+            if exits:
+                # The finally clause's exits are only exits for the try block
+                # as a whole if the try block had some exits to begin with.
+                exits = final_exits
+
+        return exits
+
+    @contract(starts='ArcStarts', exits='ArcStarts', returns='ArcStarts')
+    def _combine_finally_starts(self, starts, exits):
+        """Helper for building the cause of `finally` branches.
+
+        "finally" clauses might not execute their exits, and the causes could
+        be due to a failure to execute any of the exits in the try block. So
+        we use the causes from `starts` as the causes for `exits`.
+        """
+        causes = []
+        for start in sorted(starts):
+            if start.cause is not None:
+                causes.append(start.cause.format(lineno=start.lineno))
+        cause = " or ".join(causes)
+        exits = {ArcStart(xit.lineno, cause) for xit in exits}
+        return exits
+
+    @contract(returns='ArcStarts')
+    def _handle__TryExcept(self, node):
+        # Python 2.7 uses separate TryExcept and TryFinally nodes. If we get
+        # TryExcept, it means there was no finally, so fake it, and treat as
+        # a general Try node.
+        node.finalbody = []
+        return self._handle__Try(node)
+
+    @contract(returns='ArcStarts')
+    def _handle__TryFinally(self, node):
+        # Python 2.7 uses separate TryExcept and TryFinally nodes. If we get
+        # TryFinally, see if there's a TryExcept nested inside. If so, merge
+        # them. Otherwise, fake fields to complete a Try node.
+        node.handlers = []
+        node.orelse = []
+
+        first = node.body[0]
+        if first.__class__.__name__ == "TryExcept" and node.lineno == first.lineno:
+            assert len(node.body) == 1
+            node.body = first.body
+            node.handlers = first.handlers
+            node.orelse = first.orelse
+
+        return self._handle__Try(node)
+
+    @contract(returns='ArcStarts')
+    def _handle__While(self, node):
+        start = to_top = self.line_for_node(node.test)
+        constant_test = self.is_constant_expr(node.test)
+        top_is_body0 = False
+        if constant_test and (env.PY3 or constant_test == "Num"):
+            top_is_body0 = True
+        if env.PYBEHAVIOR.keep_constant_test:
+            top_is_body0 = False
+        if top_is_body0:
+            to_top = self.line_for_node(node.body[0])
+        self.block_stack.append(LoopBlock(start=to_top))
+        from_start = ArcStart(start, cause="the condition on line {lineno} was never true")
+        exits = self.add_body_arcs(node.body, from_start=from_start)
+        for xit in exits:
+            self.add_arc(xit.lineno, to_top, xit.cause)
+        exits = set()
+        my_block = self.block_stack.pop()
+        exits.update(my_block.break_exits)
+        from_start = ArcStart(start, cause="the condition on line {lineno} was never false")
+        if node.orelse:
+            else_exits = self.add_body_arcs(node.orelse, from_start=from_start)
+            exits |= else_exits
+        else:
+            # No `else` clause: you can exit from the start.
+            if not constant_test:
+                exits.add(from_start)
+        return exits
+
+    @contract(returns='ArcStarts')
+    def _handle__With(self, node):
+        start = self.line_for_node(node)
+        exits = self.add_body_arcs(node.body, from_start=ArcStart(start))
+        return exits
+
+    _handle__AsyncWith = _handle__With
+
+    def _code_object__Module(self, node):
+        start = self.line_for_node(node)
+        if node.body:
+            exits = self.add_body_arcs(node.body, from_start=ArcStart(-start))
+            for xit in exits:
+                self.add_arc(xit.lineno, -start, xit.cause, "didn't exit the module")
+        else:
+            # Empty module.
+            self.add_arc(-start, start)
+            self.add_arc(start, -start)
+
+    def _process_function_def(self, start, node):
+        self.funcdefs.add((start, node.body[-1].lineno, node.name))
+
+    def _code_object__FunctionDef(self, node):
+        start = self.line_for_node(node)
+        self.block_stack.append(FunctionBlock(start=start, name=node.name))
+        exits = self.add_body_arcs(node.body, from_start=ArcStart(-start))
+        self.process_return_exits(exits)
+        self._process_function_def(start, node)
+        self.block_stack.pop()
+
+    _code_object__AsyncFunctionDef = _code_object__FunctionDef
+
+    def _code_object__ClassDef(self, node):
+        start = self.line_for_node(node)
+        self.add_arc(-start, start)
+        exits = self.add_body_arcs(node.body, from_start=ArcStart(start))
+        for xit in exits:
+            self.add_arc(
+                xit.lineno, -start, xit.cause,
+                "didn't exit the body of class {!r}".format(node.name),
+            )
+
+    def _make_oneline_code_method(noun):     # pylint: disable=no-self-argument
+        """A function to make methods for online callable _code_object__ methods."""
+        def _code_object__oneline_callable(self, node):
+            start = self.line_for_node(node)
+            self.add_arc(-start, start, None, "didn't run the {} on line {}".format(noun, start))
+            self.add_arc(
+                start, -start, None,
+                "didn't finish the {} on line {}".format(noun, start),
+            )
+        return _code_object__oneline_callable
+
+    _code_object__Lambda = _make_oneline_code_method("lambda")
+    _code_object__GeneratorExp = _make_oneline_code_method("generator expression")
+    _code_object__DictComp = _make_oneline_code_method("dictionary comprehension")
+    _code_object__SetComp = _make_oneline_code_method("set comprehension")
+    if env.PY3:
+        _code_object__ListComp = _make_oneline_code_method("list comprehension")
+
+
+if AST_DUMP:            # pragma: debugging
+    # Code only used when dumping the AST for debugging.
+
+    SKIP_DUMP_FIELDS = ["ctx"]
+
+    def _is_simple_value(value):
+        """Is `value` simple enough to be displayed on a single line?"""
+        return (
+            value in [None, [], (), {}, set()] or
+            isinstance(value, (string_class, int, float))
+        )
+
+    def ast_dump(node, depth=0):
+        """Dump the AST for `node`.
+
+        This recursively walks the AST, printing a readable version.
+
+        """
+        indent = " " * depth
+        if not isinstance(node, ast.AST):
+            print("{}<{} {!r}>".format(indent, node.__class__.__name__, node))
+            return
+
+        lineno = getattr(node, "lineno", None)
+        if lineno is not None:
+            linemark = " @ {}".format(node.lineno)
+        else:
+            linemark = ""
+        head = "{}<{}{}".format(indent, node.__class__.__name__, linemark)
+
+        named_fields = [
+            (name, value)
+            for name, value in ast.iter_fields(node)
+            if name not in SKIP_DUMP_FIELDS
+        ]
+        if not named_fields:
+            print("{}>".format(head))
+        elif len(named_fields) == 1 and _is_simple_value(named_fields[0][1]):
+            field_name, value = named_fields[0]
+            print("{} {}: {!r}>".format(head, field_name, value))
+        else:
+            print(head)
+            if 0:
+                print("{}# mro: {}".format(
+                    indent, ", ".join(c.__name__ for c in node.__class__.__mro__[1:]),
+                ))
+            next_indent = indent + "    "
+            for field_name, value in named_fields:
+                prefix = "{}{}:".format(next_indent, field_name)
+                if _is_simple_value(value):
+                    print("{} {!r}".format(prefix, value))
+                elif isinstance(value, list):
+                    print("{} [".format(prefix))
+                    for n in value:
+                        ast_dump(n, depth + 8)
+                    print("{}]".format(next_indent))
+                else:
+                    print(prefix)
+                    ast_dump(value, depth + 8)
+
+            print("{}>".format(indent))
diff --git a/contrib/python/coverage/py3/coverage/phystokens.py b/contrib/python/coverage/py3/coverage/phystokens.py
new file mode 100644
index 0000000000..54378b3bc8
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/phystokens.py
@@ -0,0 +1,297 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Better tokenizing for coverage.py."""
+
+import codecs
+import keyword
+import re
+import sys
+import token
+import tokenize
+
+from coverage import env
+from coverage.backward import iternext, unicode_class
+from coverage.misc import contract
+
+
+def phys_tokens(toks):
+    """Return all physical tokens, even line continuations.
+
+    tokenize.generate_tokens() doesn't return a token for the backslash that
+    continues lines.  This wrapper provides those tokens so that we can
+    re-create a faithful representation of the original source.
+
+    Returns the same values as generate_tokens()
+
+    """
+    last_line = None
+    last_lineno = -1
+    last_ttext = None
+    for ttype, ttext, (slineno, scol), (elineno, ecol), ltext in toks:
+        if last_lineno != elineno:
+            if last_line and last_line.endswith("\\\n"):
+                # We are at the beginning of a new line, and the last line
+                # ended with a backslash.  We probably have to inject a
+                # backslash token into the stream. Unfortunately, there's more
+                # to figure out.  This code::
+                #
+                #   usage = """\
+                #   HEY THERE
+                #   """
+                #
+                # triggers this condition, but the token text is::
+                #
+                #   '"""\\\nHEY THERE\n"""'
+                #
+                # so we need to figure out if the backslash is already in the
+                # string token or not.
+                inject_backslash = True
+                if last_ttext.endswith("\\"):
+                    inject_backslash = False
+                elif ttype == token.STRING:
+                    if "\n" in ttext and ttext.split('\n', 1)[0][-1] == '\\':
+                        # It's a multi-line string and the first line ends with
+                        # a backslash, so we don't need to inject another.
+                        inject_backslash = False
+                if inject_backslash:
+                    # Figure out what column the backslash is in.
+                    ccol = len(last_line.split("\n")[-2]) - 1
+                    # Yield the token, with a fake token type.
+                    yield (
+                        99999, "\\\n",
+                        (slineno, ccol), (slineno, ccol+2),
+                        last_line
+                        )
+            last_line = ltext
+        if ttype not in (tokenize.NEWLINE, tokenize.NL):
+            last_ttext = ttext
+        yield ttype, ttext, (slineno, scol), (elineno, ecol), ltext
+        last_lineno = elineno
+
+
+@contract(source='unicode')
+def source_token_lines(source):
+    """Generate a series of lines, one for each line in `source`.
+
+    Each line is a list of pairs, each pair is a token::
+
+        [('key', 'def'), ('ws', ' '), ('nam', 'hello'), ('op', '('), ... ]
+
+    Each pair has a token class, and the token text.
+
+    If you concatenate all the token texts, and then join them with newlines,
+    you should have your original `source` back, with two differences:
+    trailing whitespace is not preserved, and a final line with no newline
+    is indistinguishable from a final line with a newline.
+
+    """
+
+    ws_tokens = {token.INDENT, token.DEDENT, token.NEWLINE, tokenize.NL}
+    line = []
+    col = 0
+
+    source = source.expandtabs(8).replace('\r\n', '\n')
+    tokgen = generate_tokens(source)
+
+    for ttype, ttext, (_, scol), (_, ecol), _ in phys_tokens(tokgen):
+        mark_start = True
+        for part in re.split('(\n)', ttext):
+            if part == '\n':
+                yield line
+                line = []
+                col = 0
+                mark_end = False
+            elif part == '':
+                mark_end = False
+            elif ttype in ws_tokens:
+                mark_end = False
+            else:
+                if mark_start and scol > col:
+                    line.append(("ws", u" " * (scol - col)))
+                    mark_start = False
+                tok_class = tokenize.tok_name.get(ttype, 'xx').lower()[:3]
+                if ttype == token.NAME and keyword.iskeyword(ttext):
+                    tok_class = "key"
+                line.append((tok_class, part))
+                mark_end = True
+            scol = 0
+        if mark_end:
+            col = ecol
+
+    if line:
+        yield line
+
+
+class CachedTokenizer(object):
+    """A one-element cache around tokenize.generate_tokens.
+
+    When reporting, coverage.py tokenizes files twice, once to find the
+    structure of the file, and once to syntax-color it.  Tokenizing is
+    expensive, and easily cached.
+
+    This is a one-element cache so that our twice-in-a-row tokenizing doesn't
+    actually tokenize twice.
+
+    """
+    def __init__(self):
+        self.last_text = None
+        self.last_tokens = None
+
+    @contract(text='unicode')
+    def generate_tokens(self, text):
+        """A stand-in for `tokenize.generate_tokens`."""
+        if text != self.last_text:
+            self.last_text = text
+            readline = iternext(text.splitlines(True))
+            self.last_tokens = list(tokenize.generate_tokens(readline))
+        return self.last_tokens
+
+# Create our generate_tokens cache as a callable replacement function.
+generate_tokens = CachedTokenizer().generate_tokens
+
+
+COOKIE_RE = re.compile(r"^[ \t]*#.*coding[:=][ \t]*([-\w.]+)", flags=re.MULTILINE)
+
+@contract(source='bytes')
+def _source_encoding_py2(source):
+    """Determine the encoding for `source`, according to PEP 263.
+
+    `source` is a byte string, the text of the program.
+
+    Returns a string, the name of the encoding.
+
+    """
+    assert isinstance(source, bytes)
+
+    # Do this so the detect_encode code we copied will work.
+    readline = iternext(source.splitlines(True))
+
+    # This is mostly code adapted from Py3.2's tokenize module.
+
+    def _get_normal_name(orig_enc):
+        """Imitates get_normal_name in tokenizer.c."""
+        # Only care about the first 12 characters.
+        enc = orig_enc[:12].lower().replace("_", "-")
+        if re.match(r"^utf-8($|-)", enc):
+            return "utf-8"
+        if re.match(r"^(latin-1|iso-8859-1|iso-latin-1)($|-)", enc):
+            return "iso-8859-1"
+        return orig_enc
+
+    # From detect_encode():
+    # It detects the encoding from the presence of a UTF-8 BOM or an encoding
+    # cookie as specified in PEP-0263.  If both a BOM and a cookie are present,
+    # but disagree, a SyntaxError will be raised.  If the encoding cookie is an
+    # invalid charset, raise a SyntaxError.  Note that if a UTF-8 BOM is found,
+    # 'utf-8-sig' is returned.
+
+    # If no encoding is specified, then the default will be returned.
+    default = 'ascii'
+
+    bom_found = False
+    encoding = None
+
+    def read_or_stop():
+        """Get the next source line, or ''."""
+        try:
+            return readline()
+        except StopIteration:
+            return ''
+
+    def find_cookie(line):
+        """Find an encoding cookie in `line`."""
+        try:
+            line_string = line.decode('ascii')
+        except UnicodeDecodeError:
+            return None
+
+        matches = COOKIE_RE.findall(line_string)
+        if not matches:
+            return None
+        encoding = _get_normal_name(matches[0])
+        try:
+            codec = codecs.lookup(encoding)
+        except LookupError:
+            # This behavior mimics the Python interpreter
+            raise SyntaxError("unknown encoding: " + encoding)
+
+        if bom_found:
+            # codecs in 2.3 were raw tuples of functions, assume the best.
+            codec_name = getattr(codec, 'name', encoding)
+            if codec_name != 'utf-8':
+                # This behavior mimics the Python interpreter
+                raise SyntaxError('encoding problem: utf-8')
+            encoding += '-sig'
+        return encoding
+
+    first = read_or_stop()
+    if first.startswith(codecs.BOM_UTF8):
+        bom_found = True
+        first = first[3:]
+        default = 'utf-8-sig'
+    if not first:
+        return default
+
+    encoding = find_cookie(first)
+    if encoding:
+        return encoding
+
+    second = read_or_stop()
+    if not second:
+        return default
+
+    encoding = find_cookie(second)
+    if encoding:
+        return encoding
+
+    return default
+
+
+@contract(source='bytes')
+def _source_encoding_py3(source):
+    """Determine the encoding for `source`, according to PEP 263.
+
+    `source` is a byte string: the text of the program.
+
+    Returns a string, the name of the encoding.
+
+    """
+    readline = iternext(source.splitlines(True))
+    return tokenize.detect_encoding(readline)[0]
+
+
+if env.PY3:
+    source_encoding = _source_encoding_py3
+else:
+    source_encoding = _source_encoding_py2
+
+
+@contract(source='unicode')
+def compile_unicode(source, filename, mode):
+    """Just like the `compile` builtin, but works on any Unicode string.
+
+    Python 2's compile() builtin has a stupid restriction: if the source string
+    is Unicode, then it may not have a encoding declaration in it.  Why not?
+    Who knows!  It also decodes to utf8, and then tries to interpret those utf8
+    bytes according to the encoding declaration.  Why? Who knows!
+
+    This function neuters the coding declaration, and compiles it.
+
+    """
+    source = neuter_encoding_declaration(source)
+    if env.PY2 and isinstance(filename, unicode_class):
+        filename = filename.encode(sys.getfilesystemencoding(), "replace")
+    code = compile(source, filename, mode)
+    return code
+
+
+@contract(source='unicode', returns='unicode')
+def neuter_encoding_declaration(source):
+    """Return `source`, with any encoding declaration neutered."""
+    if COOKIE_RE.search(source):
+        source_lines = source.splitlines(True)
+        for lineno in range(min(2, len(source_lines))):
+            source_lines[lineno] = COOKIE_RE.sub("# (deleted declaration)", source_lines[lineno])
+        source = "".join(source_lines)
+    return source
diff --git a/contrib/python/coverage/py3/coverage/plugin.py b/contrib/python/coverage/py3/coverage/plugin.py
new file mode 100644
index 0000000000..6997b489bb
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/plugin.py
@@ -0,0 +1,533 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""
+.. versionadded:: 4.0
+
+Plug-in interfaces for coverage.py.
+
+Coverage.py supports a few different kinds of plug-ins that change its
+behavior:
+
+* File tracers implement tracing of non-Python file types.
+
+* Configurers add custom configuration, using Python code to change the
+  configuration.
+
+* Dynamic context switchers decide when the dynamic context has changed, for
+  example, to record what test function produced the coverage.
+
+To write a coverage.py plug-in, create a module with a subclass of
+:class:`~coverage.CoveragePlugin`.  You will override methods in your class to
+participate in various aspects of coverage.py's processing.
+Different types of plug-ins have to override different methods.
+
+Any plug-in can optionally implement :meth:`~coverage.CoveragePlugin.sys_info`
+to provide debugging information about their operation.
+
+Your module must also contain a ``coverage_init`` function that registers an
+instance of your plug-in class::
+
+    import coverage
+
+    class MyPlugin(coverage.CoveragePlugin):
+        ...
+
+    def coverage_init(reg, options):
+        reg.add_file_tracer(MyPlugin())
+
+You use the `reg` parameter passed to your ``coverage_init`` function to
+register your plug-in object.  The registration method you call depends on
+what kind of plug-in it is.
+
+If your plug-in takes options, the `options` parameter is a dictionary of your
+plug-in's options from the coverage.py configuration file.  Use them however
+you want to configure your object before registering it.
+
+Coverage.py will store its own information on your plug-in object, using
+attributes whose names start with ``_coverage_``.  Don't be startled.
+
+.. warning::
+    Plug-ins are imported by coverage.py before it begins measuring code.
+    If you write a plugin in your own project, it might import your product
+    code before coverage.py can start measuring.  This can result in your
+    own code being reported as missing.
+
+    One solution is to put your plugins in your project tree, but not in
+    your importable Python package.
+
+
+.. _file_tracer_plugins:
+
+File Tracers
+============
+
+File tracers implement measurement support for non-Python files.  File tracers
+implement the :meth:`~coverage.CoveragePlugin.file_tracer` method to claim
+files and the :meth:`~coverage.CoveragePlugin.file_reporter` method to report
+on those files.
+
+In your ``coverage_init`` function, use the ``add_file_tracer`` method to
+register your file tracer.
+
+
+.. _configurer_plugins:
+
+Configurers
+===========
+
+.. versionadded:: 4.5
+
+Configurers modify the configuration of coverage.py during start-up.
+Configurers implement the :meth:`~coverage.CoveragePlugin.configure` method to
+change the configuration.
+
+In your ``coverage_init`` function, use the ``add_configurer`` method to
+register your configurer.
+
+
+.. _dynamic_context_plugins:
+
+Dynamic Context Switchers
+=========================
+
+.. versionadded:: 5.0
+
+Dynamic context switcher plugins implement the
+:meth:`~coverage.CoveragePlugin.dynamic_context` method to dynamically compute
+the context label for each measured frame.
+
+Computed context labels are useful when you want to group measured data without
+modifying the source code.
+
+For example, you could write a plugin that checks `frame.f_code` to inspect
+the currently executed method, and set the context label to a fully qualified
+method name if it's an instance method of `unittest.TestCase` and the method
+name starts with 'test'.  Such a plugin would provide basic coverage grouping
+by test and could be used with test runners that have no built-in coveragepy
+support.
+
+In your ``coverage_init`` function, use the ``add_dynamic_context`` method to
+register your dynamic context switcher.
+
+"""
+
+from coverage import files
+from coverage.misc import contract, _needs_to_implement
+
+
+class CoveragePlugin(object):
+    """Base class for coverage.py plug-ins."""
+
+    def file_tracer(self, filename):        # pylint: disable=unused-argument
+        """Get a :class:`FileTracer` object for a file.
+
+        Plug-in type: file tracer.
+
+        Every Python source file is offered to your plug-in to give it a chance
+        to take responsibility for tracing the file.  If your plug-in can
+        handle the file, it should return a :class:`FileTracer` object.
+        Otherwise return None.
+
+        There is no way to register your plug-in for particular files.
+        Instead, this method is invoked for all  files as they are executed,
+        and the plug-in decides whether it can trace the file or not.
+        Be prepared for `filename` to refer to all kinds of files that have
+        nothing to do with your plug-in.
+
+        The file name will be a Python file being executed.  There are two
+        broad categories of behavior for a plug-in, depending on the kind of
+        files your plug-in supports:
+
+        * Static file names: each of your original source files has been
+          converted into a distinct Python file.  Your plug-in is invoked with
+          the Python file name, and it maps it back to its original source
+          file.
+
+        * Dynamic file names: all of your source files are executed by the same
+          Python file.  In this case, your plug-in implements
+          :meth:`FileTracer.dynamic_source_filename` to provide the actual
+          source file for each execution frame.
+
+        `filename` is a string, the path to the file being considered.  This is
+        the absolute real path to the file.  If you are comparing to other
+        paths, be sure to take this into account.
+
+        Returns a :class:`FileTracer` object to use to trace `filename`, or
+        None if this plug-in cannot trace this file.
+
+        """
+        return None
+
+    def file_reporter(self, filename):      # pylint: disable=unused-argument
+        """Get the :class:`FileReporter` class to use for a file.
+
+        Plug-in type: file tracer.
+
+        This will only be invoked if `filename` returns non-None from
+        :meth:`file_tracer`.  It's an error to return None from this method.
+
+        Returns a :class:`FileReporter` object to use to report on `filename`,
+        or the string `"python"` to have coverage.py treat the file as Python.
+
+        """
+        _needs_to_implement(self, "file_reporter")
+
+    def dynamic_context(self, frame):       # pylint: disable=unused-argument
+        """Get the dynamically computed context label for `frame`.
+
+        Plug-in type: dynamic context.
+
+        This method is invoked for each frame when outside of a dynamic
+        context, to see if a new dynamic context should be started.  If it
+        returns a string, a new context label is set for this and deeper
+        frames.  The dynamic context ends when this frame returns.
+
+        Returns a string to start a new dynamic context, or None if no new
+        context should be started.
+
+        """
+        return None
+
+    def find_executable_files(self, src_dir):       # pylint: disable=unused-argument
+        """Yield all of the executable files in `src_dir`, recursively.
+
+        Plug-in type: file tracer.
+
+        Executability is a plug-in-specific property, but generally means files
+        which would have been considered for coverage analysis, had they been
+        included automatically.
+
+        Returns or yields a sequence of strings, the paths to files that could
+        have been executed, including files that had been executed.
+
+        """
+        return []
+
+    def configure(self, config):
+        """Modify the configuration of coverage.py.
+
+        Plug-in type: configurer.
+
+        This method is called during coverage.py start-up, to give your plug-in
+        a chance to change the configuration.  The `config` parameter is an
+        object with :meth:`~coverage.Coverage.get_option` and
+        :meth:`~coverage.Coverage.set_option` methods.  Do not call any other
+        methods on the `config` object.
+
+        """
+        pass
+
+    def sys_info(self):
+        """Get a list of information useful for debugging.
+
+        Plug-in type: any.
+
+        This method will be invoked for ``--debug=sys``.  Your
+        plug-in can return any information it wants to be displayed.
+
+        Returns a list of pairs: `[(name, value), ...]`.
+
+        """
+        return []
+
+
+class FileTracer(object):
+    """Support needed for files during the execution phase.
+
+    File tracer plug-ins implement subclasses of FileTracer to return from
+    their :meth:`~CoveragePlugin.file_tracer` method.
+
+    You may construct this object from :meth:`CoveragePlugin.file_tracer` any
+    way you like.  A natural choice would be to pass the file name given to
+    `file_tracer`.
+
+    `FileTracer` objects should only be created in the
+    :meth:`CoveragePlugin.file_tracer` method.
+
+    See :ref:`howitworks` for details of the different coverage.py phases.
+
+    """
+
+    def source_filename(self):
+        """The source file name for this file.
+
+        This may be any file name you like.  A key responsibility of a plug-in
+        is to own the mapping from Python execution back to whatever source
+        file name was originally the source of the code.
+
+        See :meth:`CoveragePlugin.file_tracer` for details about static and
+        dynamic file names.
+
+        Returns the file name to credit with this execution.
+
+        """
+        _needs_to_implement(self, "source_filename")
+
+    def has_dynamic_source_filename(self):
+        """Does this FileTracer have dynamic source file names?
+
+        FileTracers can provide dynamically determined file names by
+        implementing :meth:`dynamic_source_filename`.  Invoking that function
+        is expensive. To determine whether to invoke it, coverage.py uses the
+        result of this function to know if it needs to bother invoking
+        :meth:`dynamic_source_filename`.
+
+        See :meth:`CoveragePlugin.file_tracer` for details about static and
+        dynamic file names.
+
+        Returns True if :meth:`dynamic_source_filename` should be called to get
+        dynamic source file names.
+
+        """
+        return False
+
+    def dynamic_source_filename(self, filename, frame):     # pylint: disable=unused-argument
+        """Get a dynamically computed source file name.
+
+        Some plug-ins need to compute the source file name dynamically for each
+        frame.
+
+        This function will not be invoked if
+        :meth:`has_dynamic_source_filename` returns False.
+
+        Returns the source file name for this frame, or None if this frame
+        shouldn't be measured.
+
+        """
+        return None
+
+    def line_number_range(self, frame):
+        """Get the range of source line numbers for a given a call frame.
+
+        The call frame is examined, and the source line number in the original
+        file is returned.  The return value is a pair of numbers, the starting
+        line number and the ending line number, both inclusive.  For example,
+        returning (5, 7) means that lines 5, 6, and 7 should be considered
+        executed.
+
+        This function might decide that the frame doesn't indicate any lines
+        from the source file were executed.  Return (-1, -1) in this case to
+        tell coverage.py that no lines should be recorded for this frame.
+
+        """
+        lineno = frame.f_lineno
+        return lineno, lineno
+
+
+class FileReporter(object):
+    """Support needed for files during the analysis and reporting phases.
+
+    File tracer plug-ins implement a subclass of `FileReporter`, and return
+    instances from their :meth:`CoveragePlugin.file_reporter` method.
+
+    There are many methods here, but only :meth:`lines` is required, to provide
+    the set of executable lines in the file.
+
+    See :ref:`howitworks` for details of the different coverage.py phases.
+
+    """
+
+    def __init__(self, filename):
+        """Simple initialization of a `FileReporter`.
+
+        The `filename` argument is the path to the file being reported.  This
+        will be available as the `.filename` attribute on the object.  Other
+        method implementations on this base class rely on this attribute.
+
+        """
+        self.filename = filename
+
+    def __repr__(self):
+        return "<{0.__class__.__name__} filename={0.filename!r}>".format(self)
+
+    def relative_filename(self):
+        """Get the relative file name for this file.
+
+        This file path will be displayed in reports.  The default
+        implementation will supply the actual project-relative file path.  You
+        only need to supply this method if you have an unusual syntax for file
+        paths.
+
+        """
+        return files.relative_filename(self.filename)
+
+    @contract(returns='unicode')
+    def source(self):
+        """Get the source for the file.
+
+        Returns a Unicode string.
+
+        The base implementation simply reads the `self.filename` file and
+        decodes it as UTF8.  Override this method if your file isn't readable
+        as a text file, or if you need other encoding support.
+
+        """
+        with open(self.filename, "rb") as f:
+            return f.read().decode("utf8")
+
+    def lines(self):
+        """Get the executable lines in this file.
+
+        Your plug-in must determine which lines in the file were possibly
+        executable.  This method returns a set of those line numbers.
+
+        Returns a set of line numbers.
+
+        """
+        _needs_to_implement(self, "lines")
+
+    def excluded_lines(self):
+        """Get the excluded executable lines in this file.
+
+        Your plug-in can use any method it likes to allow the user to exclude
+        executable lines from consideration.
+
+        Returns a set of line numbers.
+
+        The base implementation returns the empty set.
+
+        """
+        return set()
+
+    def translate_lines(self, lines):
+        """Translate recorded lines into reported lines.
+
+        Some file formats will want to report lines slightly differently than
+        they are recorded.  For example, Python records the last line of a
+        multi-line statement, but reports are nicer if they mention the first
+        line.
+
+        Your plug-in can optionally define this method to perform these kinds
+        of adjustment.
+
+        `lines` is a sequence of integers, the recorded line numbers.
+
+        Returns a set of integers, the adjusted line numbers.
+
+        The base implementation returns the numbers unchanged.
+
+        """
+        return set(lines)
+
+    def arcs(self):
+        """Get the executable arcs in this file.
+
+        To support branch coverage, your plug-in needs to be able to indicate
+        possible execution paths, as a set of line number pairs.  Each pair is
+        a `(prev, next)` pair indicating that execution can transition from the
+        `prev` line number to the `next` line number.
+
+        Returns a set of pairs of line numbers.  The default implementation
+        returns an empty set.
+
+        """
+        return set()
+
+    def no_branch_lines(self):
+        """Get the lines excused from branch coverage in this file.
+
+        Your plug-in can use any method it likes to allow the user to exclude
+        lines from consideration of branch coverage.
+
+        Returns a set of line numbers.
+
+        The base implementation returns the empty set.
+
+        """
+        return set()
+
+    def translate_arcs(self, arcs):
+        """Translate recorded arcs into reported arcs.
+
+        Similar to :meth:`translate_lines`, but for arcs.  `arcs` is a set of
+        line number pairs.
+
+        Returns a set of line number pairs.
+
+        The default implementation returns `arcs` unchanged.
+
+        """
+        return arcs
+
+    def exit_counts(self):
+        """Get a count of exits from that each line.
+
+        To determine which lines are branches, coverage.py looks for lines that
+        have more than one exit.  This function creates a dict mapping each
+        executable line number to a count of how many exits it has.
+
+        To be honest, this feels wrong, and should be refactored.  Let me know
+        if you attempt to implement this method in your plug-in...
+
+        """
+        return {}
+
+    def missing_arc_description(self, start, end, executed_arcs=None):     # pylint: disable=unused-argument
+        """Provide an English sentence describing a missing arc.
+
+        The `start` and `end` arguments are the line numbers of the missing
+        arc. Negative numbers indicate entering or exiting code objects.
+
+        The `executed_arcs` argument is a set of line number pairs, the arcs
+        that were executed in this file.
+
+        By default, this simply returns the string "Line {start} didn't jump
+        to {end}".
+
+        """
+        return "Line {start} didn't jump to line {end}".format(start=start, end=end)
+
+    def source_token_lines(self):
+        """Generate a series of tokenized lines, one for each line in `source`.
+
+        These tokens are used for syntax-colored reports.
+
+        Each line is a list of pairs, each pair is a token::
+
+            [('key', 'def'), ('ws', ' '), ('nam', 'hello'), ('op', '('), ... ]
+
+        Each pair has a token class, and the token text.  The token classes
+        are:
+
+        * ``'com'``: a comment
+        * ``'key'``: a keyword
+        * ``'nam'``: a name, or identifier
+        * ``'num'``: a number
+        * ``'op'``: an operator
+        * ``'str'``: a string literal
+        * ``'ws'``: some white space
+        * ``'txt'``: some other kind of text
+
+        If you concatenate all the token texts, and then join them with
+        newlines, you should have your original source back.
+
+        The default implementation simply returns each line tagged as
+        ``'txt'``.
+
+        """
+        for line in self.source().splitlines():
+            yield [('txt', line)]
+
+    # Annoying comparison operators. Py3k wants __lt__ etc, and Py2k needs all
+    # of them defined.
+
+    def __eq__(self, other):
+        return isinstance(other, FileReporter) and self.filename == other.filename
+
+    def __ne__(self, other):
+        return not (self == other)
+
+    def __lt__(self, other):
+        return self.filename < other.filename
+
+    def __le__(self, other):
+        return self.filename <= other.filename
+
+    def __gt__(self, other):
+        return self.filename > other.filename
+
+    def __ge__(self, other):
+        return self.filename >= other.filename
+
+    __hash__ = None     # This object doesn't need to be hashed.
diff --git a/contrib/python/coverage/py3/coverage/plugin_support.py b/contrib/python/coverage/py3/coverage/plugin_support.py
new file mode 100644
index 0000000000..89c1c7658f
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/plugin_support.py
@@ -0,0 +1,281 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Support for plugins."""
+
+import os
+import os.path
+import sys
+
+from coverage.misc import CoverageException, isolate_module
+from coverage.plugin import CoveragePlugin, FileTracer, FileReporter
+
+os = isolate_module(os)
+
+
+class Plugins(object):
+    """The currently loaded collection of coverage.py plugins."""
+
+    def __init__(self):
+        self.order = []
+        self.names = {}
+        self.file_tracers = []
+        self.configurers = []
+        self.context_switchers = []
+
+        self.current_module = None
+        self.debug = None
+
+    @classmethod
+    def load_plugins(cls, modules, config, debug=None):
+        """Load plugins from `modules`.
+
+        Returns a Plugins object with the loaded and configured plugins.
+
+        """
+        plugins = cls()
+        plugins.debug = debug
+
+        for module in modules:
+            plugins.current_module = module
+            __import__(module)
+            mod = sys.modules[module]
+
+            coverage_init = getattr(mod, "coverage_init", None)
+            if not coverage_init:
+                raise CoverageException(
+                    "Plugin module %r didn't define a coverage_init function" % module
+                )
+
+            options = config.get_plugin_options(module)
+            coverage_init(plugins, options)
+
+        plugins.current_module = None
+        return plugins
+
+    def add_file_tracer(self, plugin):
+        """Add a file tracer plugin.
+
+        `plugin` is an instance of a third-party plugin class.  It must
+        implement the :meth:`CoveragePlugin.file_tracer` method.
+
+        """
+        self._add_plugin(plugin, self.file_tracers)
+
+    def add_configurer(self, plugin):
+        """Add a configuring plugin.
+
+        `plugin` is an instance of a third-party plugin class. It must
+        implement the :meth:`CoveragePlugin.configure` method.
+
+        """
+        self._add_plugin(plugin, self.configurers)
+
+    def add_dynamic_context(self, plugin):
+        """Add a dynamic context plugin.
+
+        `plugin` is an instance of a third-party plugin class.  It must
+        implement the :meth:`CoveragePlugin.dynamic_context` method.
+
+        """
+        self._add_plugin(plugin, self.context_switchers)
+
+    def add_noop(self, plugin):
+        """Add a plugin that does nothing.
+
+        This is only useful for testing the plugin support.
+
+        """
+        self._add_plugin(plugin, None)
+
+    def _add_plugin(self, plugin, specialized):
+        """Add a plugin object.
+
+        `plugin` is a :class:`CoveragePlugin` instance to add.  `specialized`
+        is a list to append the plugin to.
+
+        """
+        plugin_name = "%s.%s" % (self.current_module, plugin.__class__.__name__)
+        if self.debug and self.debug.should('plugin'):
+            self.debug.write("Loaded plugin %r: %r" % (self.current_module, plugin))
+            labelled = LabelledDebug("plugin %r" % (self.current_module,), self.debug)
+            plugin = DebugPluginWrapper(plugin, labelled)
+
+        # pylint: disable=attribute-defined-outside-init
+        plugin._coverage_plugin_name = plugin_name
+        plugin._coverage_enabled = True
+        self.order.append(plugin)
+        self.names[plugin_name] = plugin
+        if specialized is not None:
+            specialized.append(plugin)
+
+    def __nonzero__(self):
+        return bool(self.order)
+
+    __bool__ = __nonzero__
+
+    def __iter__(self):
+        return iter(self.order)
+
+    def get(self, plugin_name):
+        """Return a plugin by name."""
+        return self.names[plugin_name]
+
+
+class LabelledDebug(object):
+    """A Debug writer, but with labels for prepending to the messages."""
+
+    def __init__(self, label, debug, prev_labels=()):
+        self.labels = list(prev_labels) + [label]
+        self.debug = debug
+
+    def add_label(self, label):
+        """Add a label to the writer, and return a new `LabelledDebug`."""
+        return LabelledDebug(label, self.debug, self.labels)
+
+    def message_prefix(self):
+        """The prefix to use on messages, combining the labels."""
+        prefixes = self.labels + ['']
+        return ":\n".join("  "*i+label for i, label in enumerate(prefixes))
+
+    def write(self, message):
+        """Write `message`, but with the labels prepended."""
+        self.debug.write("%s%s" % (self.message_prefix(), message))
+
+
+class DebugPluginWrapper(CoveragePlugin):
+    """Wrap a plugin, and use debug to report on what it's doing."""
+
+    def __init__(self, plugin, debug):
+        super(DebugPluginWrapper, self).__init__()
+        self.plugin = plugin
+        self.debug = debug
+
+    def file_tracer(self, filename):
+        tracer = self.plugin.file_tracer(filename)
+        self.debug.write("file_tracer(%r) --> %r" % (filename, tracer))
+        if tracer:
+            debug = self.debug.add_label("file %r" % (filename,))
+            tracer = DebugFileTracerWrapper(tracer, debug)
+        return tracer
+
+    def file_reporter(self, filename):
+        reporter = self.plugin.file_reporter(filename)
+        self.debug.write("file_reporter(%r) --> %r" % (filename, reporter))
+        if reporter:
+            debug = self.debug.add_label("file %r" % (filename,))
+            reporter = DebugFileReporterWrapper(filename, reporter, debug)
+        return reporter
+
+    def dynamic_context(self, frame):
+        context = self.plugin.dynamic_context(frame)
+        self.debug.write("dynamic_context(%r) --> %r" % (frame, context))
+        return context
+
+    def find_executable_files(self, src_dir):
+        executable_files = self.plugin.find_executable_files(src_dir)
+        self.debug.write("find_executable_files(%r) --> %r" % (src_dir, executable_files))
+        return executable_files
+
+    def configure(self, config):
+        self.debug.write("configure(%r)" % (config,))
+        self.plugin.configure(config)
+
+    def sys_info(self):
+        return self.plugin.sys_info()
+
+
+class DebugFileTracerWrapper(FileTracer):
+    """A debugging `FileTracer`."""
+
+    def __init__(self, tracer, debug):
+        self.tracer = tracer
+        self.debug = debug
+
+    def _show_frame(self, frame):
+        """A short string identifying a frame, for debug messages."""
+        return "%s@%d" % (
+            os.path.basename(frame.f_code.co_filename),
+            frame.f_lineno,
+        )
+
+    def source_filename(self):
+        sfilename = self.tracer.source_filename()
+        self.debug.write("source_filename() --> %r" % (sfilename,))
+        return sfilename
+
+    def has_dynamic_source_filename(self):
+        has = self.tracer.has_dynamic_source_filename()
+        self.debug.write("has_dynamic_source_filename() --> %r" % (has,))
+        return has
+
+    def dynamic_source_filename(self, filename, frame):
+        dyn = self.tracer.dynamic_source_filename(filename, frame)
+        self.debug.write("dynamic_source_filename(%r, %s) --> %r" % (
+            filename, self._show_frame(frame), dyn,
+        ))
+        return dyn
+
+    def line_number_range(self, frame):
+        pair = self.tracer.line_number_range(frame)
+        self.debug.write("line_number_range(%s) --> %r" % (self._show_frame(frame), pair))
+        return pair
+
+
+class DebugFileReporterWrapper(FileReporter):
+    """A debugging `FileReporter`."""
+
+    def __init__(self, filename, reporter, debug):
+        super(DebugFileReporterWrapper, self).__init__(filename)
+        self.reporter = reporter
+        self.debug = debug
+
+    def relative_filename(self):
+        ret = self.reporter.relative_filename()
+        self.debug.write("relative_filename() --> %r" % (ret,))
+        return ret
+
+    def lines(self):
+        ret = self.reporter.lines()
+        self.debug.write("lines() --> %r" % (ret,))
+        return ret
+
+    def excluded_lines(self):
+        ret = self.reporter.excluded_lines()
+        self.debug.write("excluded_lines() --> %r" % (ret,))
+        return ret
+
+    def translate_lines(self, lines):
+        ret = self.reporter.translate_lines(lines)
+        self.debug.write("translate_lines(%r) --> %r" % (lines, ret))
+        return ret
+
+    def translate_arcs(self, arcs):
+        ret = self.reporter.translate_arcs(arcs)
+        self.debug.write("translate_arcs(%r) --> %r" % (arcs, ret))
+        return ret
+
+    def no_branch_lines(self):
+        ret = self.reporter.no_branch_lines()
+        self.debug.write("no_branch_lines() --> %r" % (ret,))
+        return ret
+
+    def exit_counts(self):
+        ret = self.reporter.exit_counts()
+        self.debug.write("exit_counts() --> %r" % (ret,))
+        return ret
+
+    def arcs(self):
+        ret = self.reporter.arcs()
+        self.debug.write("arcs() --> %r" % (ret,))
+        return ret
+
+    def source(self):
+        ret = self.reporter.source()
+        self.debug.write("source() --> %d chars" % (len(ret),))
+        return ret
+
+    def source_token_lines(self):
+        ret = list(self.reporter.source_token_lines())
+        self.debug.write("source_token_lines() --> %d tokens" % (len(ret),))
+        return ret
diff --git a/contrib/python/coverage/py3/coverage/python.py b/contrib/python/coverage/py3/coverage/python.py
new file mode 100644
index 0000000000..6ff19c34fe
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/python.py
@@ -0,0 +1,261 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Python source expertise for coverage.py"""
+
+import sys
+import os.path
+import types
+import zipimport
+
+from coverage import env, files
+from coverage.misc import contract, expensive, isolate_module, join_regex
+from coverage.misc import CoverageException, NoSource
+from coverage.parser import PythonParser
+from coverage.phystokens import source_token_lines, source_encoding
+from coverage.plugin import FileReporter
+
+os = isolate_module(os)
+
+
+@contract(returns='bytes')
+def read_python_source(filename):
+    """Read the Python source text from `filename`.
+
+    Returns bytes.
+
+    """
+    with open(filename, "rb") as f:
+        source = f.read()
+
+    if env.IRONPYTHON:
+        # IronPython reads Unicode strings even for "rb" files.
+        source = bytes(source)
+
+    return source.replace(b"\r\n", b"\n").replace(b"\r", b"\n")
+
+
+@contract(returns='unicode')
+def get_python_source(filename, force_fs=False):
+    """Return the source code, as unicode."""
+    if getattr(sys, 'is_standalone_binary', False) and not force_fs:
+        import __res
+
+        modname = __res.importer.file_source(filename)
+        if modname:
+            source = __res.find(modname)
+            source = source.replace(b"\r\n", b"\n").replace(b"\r", b"\n")
+            return source.decode('utf-8')
+        else:
+            # it's fake generated package
+            return u''
+    base, ext = os.path.splitext(filename)
+    if ext == ".py" and env.WINDOWS:
+        exts = [".py", ".pyw"]
+    else:
+        exts = [ext]
+
+    for ext in exts:
+        try_filename = base + ext
+        if os.path.exists(try_filename):
+            # A regular text file: open it.
+            source = read_python_source(try_filename)
+            break
+
+        # Maybe it's in a zip file?
+        source = get_zip_bytes(try_filename)
+        if source is not None:
+            break
+    else:
+        # Couldn't find source.
+        exc_msg = "No source for code: '%s'.\n" % (filename,)
+        exc_msg += "Aborting report output, consider using -i."
+        raise NoSource(exc_msg)
+
+    # Replace \f because of http://bugs.python.org/issue19035
+    source = source.replace(b'\f', b' ')
+    source = source.decode(source_encoding(source), "replace")
+
+    # Python code should always end with a line with a newline.
+    if source and source[-1] != '\n':
+        source += '\n'
+
+    return source
+
+
+@contract(returns='bytes|None')
+def get_zip_bytes(filename):
+    """Get data from `filename` if it is a zip file path.
+
+    Returns the bytestring data read from the zip file, or None if no zip file
+    could be found or `filename` isn't in it.  The data returned will be
+    an empty string if the file is empty.
+
+    """
+    markers = ['.zip'+os.sep, '.egg'+os.sep, '.pex'+os.sep]
+    for marker in markers:
+        if marker in filename:
+            parts = filename.split(marker)
+            try:
+                zi = zipimport.zipimporter(parts[0]+marker[:-1])
+            except zipimport.ZipImportError:
+                continue
+            try:
+                data = zi.get_data(parts[1])
+            except IOError:
+                continue
+            return data
+    return None
+
+
+def source_for_file(filename):
+    """Return the source filename for `filename`.
+
+    Given a file name being traced, return the best guess as to the source
+    file to attribute it to.
+
+    """
+    if filename.endswith(".py"):
+        # .py files are themselves source files.
+        return filename
+
+    elif filename.endswith((".pyc", ".pyo")):
+        # Bytecode files probably have source files near them.
+        py_filename = filename[:-1]
+        if os.path.exists(py_filename):
+            # Found a .py file, use that.
+            return py_filename
+        if env.WINDOWS:
+            # On Windows, it could be a .pyw file.
+            pyw_filename = py_filename + "w"
+            if os.path.exists(pyw_filename):
+                return pyw_filename
+        # Didn't find source, but it's probably the .py file we want.
+        return py_filename
+
+    elif filename.endswith("$py.class"):
+        # Jython is easy to guess.
+        return filename[:-9] + ".py"
+
+    # No idea, just use the file name as-is.
+    return filename
+
+
+def source_for_morf(morf):
+    """Get the source filename for the module-or-file `morf`."""
+    if hasattr(morf, '__file__') and morf.__file__:
+        filename = morf.__file__
+    elif isinstance(morf, types.ModuleType):
+        # A module should have had .__file__, otherwise we can't use it.
+        # This could be a PEP-420 namespace package.
+        raise CoverageException("Module {} has no file".format(morf))
+    else:
+        filename = morf
+
+    filename = source_for_file(files.unicode_filename(filename))
+    return filename
+
+
+class PythonFileReporter(FileReporter):
+    """Report support for a Python file."""
+
+    def __init__(self, morf, coverage=None):
+        self.coverage = coverage
+
+        filename = source_for_morf(morf)
+
+        super(PythonFileReporter, self).__init__(files.canonical_filename(filename))
+
+        if hasattr(morf, '__name__'):
+            name = morf.__name__.replace(".", os.sep)
+            if os.path.basename(filename).startswith('__init__.'):
+                name += os.sep + "__init__"
+            name += ".py"
+            name = files.unicode_filename(name)
+        else:
+            name = files.relative_filename(filename)
+        self.relname = name
+
+        self._source = None
+        self._parser = None
+        self._excluded = None
+
+    def __repr__(self):
+        return "<PythonFileReporter {!r}>".format(self.filename)
+
+    @contract(returns='unicode')
+    def relative_filename(self):
+        return self.relname
+
+    @property
+    def parser(self):
+        """Lazily create a :class:`PythonParser`."""
+        if self._parser is None:
+            self._parser = PythonParser(
+                filename=self.filename,
+                exclude=self.coverage._exclude_regex('exclude'),
+            )
+            self._parser.parse_source()
+        return self._parser
+
+    def lines(self):
+        """Return the line numbers of statements in the file."""
+        return self.parser.statements
+
+    def excluded_lines(self):
+        """Return the line numbers of statements in the file."""
+        return self.parser.excluded
+
+    def translate_lines(self, lines):
+        return self.parser.translate_lines(lines)
+
+    def translate_arcs(self, arcs):
+        return self.parser.translate_arcs(arcs)
+
+    @expensive
+    def no_branch_lines(self):
+        no_branch = self.parser.lines_matching(
+            join_regex(self.coverage.config.partial_list),
+            join_regex(self.coverage.config.partial_always_list)
+            )
+        return no_branch
+
+    @expensive
+    def arcs(self):
+        return self.parser.arcs()
+
+    @expensive
+    def exit_counts(self):
+        return self.parser.exit_counts()
+
+    def missing_arc_description(self, start, end, executed_arcs=None):
+        return self.parser.missing_arc_description(start, end, executed_arcs)
+
+    @contract(returns='unicode')
+    def source(self):
+        if self._source is None:
+            self._source = get_python_source(self.filename)
+        return self._source
+
+    def should_be_python(self):
+        """Does it seem like this file should contain Python?
+
+        This is used to decide if a file reported as part of the execution of
+        a program was really likely to have contained Python in the first
+        place.
+
+        """
+        # Get the file extension.
+        _, ext = os.path.splitext(self.filename)
+
+        # Anything named *.py* should be Python.
+        if ext.startswith('.py'):
+            return True
+        # A file with no extension should be Python.
+        if not ext:
+            return True
+        # Everything else is probably not Python.
+        return False
+
+    def source_token_lines(self):
+        return source_token_lines(self.source())
diff --git a/contrib/python/coverage/py3/coverage/pytracer.py b/contrib/python/coverage/py3/coverage/pytracer.py
new file mode 100644
index 0000000000..7ab4d3ef92
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/pytracer.py
@@ -0,0 +1,274 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Raw data collector for coverage.py."""
+
+import atexit
+import dis
+import sys
+
+from coverage import env
+
+# We need the YIELD_VALUE opcode below, in a comparison-friendly form.
+YIELD_VALUE = dis.opmap['YIELD_VALUE']
+if env.PY2:
+    YIELD_VALUE = chr(YIELD_VALUE)
+
+# When running meta-coverage, this file can try to trace itself, which confuses
+# everything.  Don't trace ourselves.
+
+THIS_FILE = __file__.rstrip("co")
+
+
+class PyTracer(object):
+    """Python implementation of the raw data tracer."""
+
+    # Because of poor implementations of trace-function-manipulating tools,
+    # the Python trace function must be kept very simple.  In particular, there
+    # must be only one function ever set as the trace function, both through
+    # sys.settrace, and as the return value from the trace function.  Put
+    # another way, the trace function must always return itself.  It cannot
+    # swap in other functions, or return None to avoid tracing a particular
+    # frame.
+    #
+    # The trace manipulator that introduced this restriction is DecoratorTools,
+    # which sets a trace function, and then later restores the pre-existing one
+    # by calling sys.settrace with a function it found in the current frame.
+    #
+    # Systems that use DecoratorTools (or similar trace manipulations) must use
+    # PyTracer to get accurate results.  The command-line --timid argument is
+    # used to force the use of this tracer.
+
+    def __init__(self):
+        # Attributes set from the collector:
+        self.data = None
+        self.trace_arcs = False
+        self.should_trace = None
+        self.should_trace_cache = None
+        self.should_start_context = None
+        self.warn = None
+        # The threading module to use, if any.
+        self.threading = None
+
+        self.cur_file_dict = None
+        self.last_line = 0          # int, but uninitialized.
+        self.cur_file_name = None
+        self.context = None
+        self.started_context = False
+
+        self.data_stack = []
+        self.last_exc_back = None
+        self.last_exc_firstlineno = 0
+        self.thread = None
+        self.stopped = False
+        self._activity = False
+
+        self.in_atexit = False
+        # On exit, self.in_atexit = True
+        atexit.register(setattr, self, 'in_atexit', True)
+
+    def __repr__(self):
+        return "<PyTracer at {}: {} lines in {} files>".format(
+            id(self),
+            sum(len(v) for v in self.data.values()),
+            len(self.data),
+        )
+
+    def log(self, marker, *args):
+        """For hard-core logging of what this tracer is doing."""
+        with open("/tmp/debug_trace.txt", "a") as f:
+            f.write("{} {}[{}]".format(
+                marker,
+                id(self),
+                len(self.data_stack),
+            ))
+            if 0:
+                f.write(".{:x}.{:x}".format(
+                    self.thread.ident,
+                    self.threading.currentThread().ident,
+                ))
+            f.write(" {}".format(" ".join(map(str, args))))
+            if 0:
+                f.write(" | ")
+                stack = " / ".join(
+                    (fname or "???").rpartition("/")[-1]
+                    for _, fname, _, _ in self.data_stack
+                )
+                f.write(stack)
+            f.write("\n")
+
+    def _trace(self, frame, event, arg_unused):
+        """The trace function passed to sys.settrace."""
+
+        if THIS_FILE in frame.f_code.co_filename:
+            return None
+
+        #self.log(":", frame.f_code.co_filename, frame.f_lineno, frame.f_code.co_name + "()", event)
+
+        if (self.stopped and sys.gettrace() == self._trace):    # pylint: disable=comparison-with-callable
+            # The PyTrace.stop() method has been called, possibly by another
+            # thread, let's deactivate ourselves now.
+            if 0:
+                self.log("---\nX", frame.f_code.co_filename, frame.f_lineno)
+                f = frame
+                while f:
+                    self.log(">", f.f_code.co_filename, f.f_lineno, f.f_code.co_name, f.f_trace)
+                    f = f.f_back
+            sys.settrace(None)
+            self.cur_file_dict, self.cur_file_name, self.last_line, self.started_context = (
+                self.data_stack.pop()
+            )
+            return None
+
+        if self.last_exc_back:
+            if frame == self.last_exc_back:
+                # Someone forgot a return event.
+                if self.trace_arcs and self.cur_file_dict:
+                    pair = (self.last_line, -self.last_exc_firstlineno)
+                    self.cur_file_dict[pair] = None
+                self.cur_file_dict, self.cur_file_name, self.last_line, self.started_context = (
+                    self.data_stack.pop()
+                )
+            self.last_exc_back = None
+
+        # if event != 'call' and frame.f_code.co_filename != self.cur_file_name:
+        #     self.log("---\n*", frame.f_code.co_filename, self.cur_file_name, frame.f_lineno)
+
+        if event == 'call':
+            # Should we start a new context?
+            if self.should_start_context and self.context is None:
+                context_maybe = self.should_start_context(frame)
+                if context_maybe is not None:
+                    self.context = context_maybe
+                    self.started_context = True
+                    self.switch_context(self.context)
+                else:
+                    self.started_context = False
+            else:
+                self.started_context = False
+
+            # Entering a new frame.  Decide if we should trace
+            # in this file.
+            self._activity = True
+            self.data_stack.append(
+                (
+                    self.cur_file_dict,
+                    self.cur_file_name,
+                    self.last_line,
+                    self.started_context,
+                )
+            )
+            filename = frame.f_code.co_filename
+            self.cur_file_name = filename
+            disp = self.should_trace_cache.get(filename)
+            if disp is None:
+                disp = self.should_trace(filename, frame)
+                self.should_trace_cache[filename] = disp
+
+            self.cur_file_dict = None
+            if disp.trace:
+                tracename = disp.source_filename
+                if tracename not in self.data:
+                    self.data[tracename] = {}
+                self.cur_file_dict = self.data[tracename]
+            # The call event is really a "start frame" event, and happens for
+            # function calls and re-entering generators.  The f_lasti field is
+            # -1 for calls, and a real offset for generators.  Use <0 as the
+            # line number for calls, and the real line number for generators.
+            if getattr(frame, 'f_lasti', -1) < 0:
+                self.last_line = -frame.f_code.co_firstlineno
+            else:
+                self.last_line = frame.f_lineno
+        elif event == 'line':
+            # Record an executed line.
+            if self.cur_file_dict is not None:
+                lineno = frame.f_lineno
+
+                if self.trace_arcs:
+                    self.cur_file_dict[(self.last_line, lineno)] = None
+                else:
+                    self.cur_file_dict[lineno] = None
+                self.last_line = lineno
+        elif event == 'return':
+            if self.trace_arcs and self.cur_file_dict:
+                # Record an arc leaving the function, but beware that a
+                # "return" event might just mean yielding from a generator.
+                # Jython seems to have an empty co_code, so just assume return.
+                code = frame.f_code.co_code
+                if (not code) or code[frame.f_lasti] != YIELD_VALUE:
+                    first = frame.f_code.co_firstlineno
+                    self.cur_file_dict[(self.last_line, -first)] = None
+            # Leaving this function, pop the filename stack.
+            self.cur_file_dict, self.cur_file_name, self.last_line, self.started_context = (
+                self.data_stack.pop()
+            )
+            # Leaving a context?
+            if self.started_context:
+                self.context = None
+                self.switch_context(None)
+        elif event == 'exception':
+            self.last_exc_back = frame.f_back
+            self.last_exc_firstlineno = frame.f_code.co_firstlineno
+        return self._trace
+
+    def start(self):
+        """Start this Tracer.
+
+        Return a Python function suitable for use with sys.settrace().
+
+        """
+        self.stopped = False
+        if self.threading:
+            if self.thread is None:
+                self.thread = self.threading.currentThread()
+            else:
+                if self.thread.ident != self.threading.currentThread().ident:
+                    # Re-starting from a different thread!? Don't set the trace
+                    # function, but we are marked as running again, so maybe it
+                    # will be ok?
+                    #self.log("~", "starting on different threads")
+                    return self._trace
+
+        sys.settrace(self._trace)
+        return self._trace
+
+    def stop(self):
+        """Stop this Tracer."""
+        # Get the active tracer callback before setting the stop flag to be
+        # able to detect if the tracer was changed prior to stopping it.
+        tf = sys.gettrace()
+
+        # Set the stop flag. The actual call to sys.settrace(None) will happen
+        # in the self._trace callback itself to make sure to call it from the
+        # right thread.
+        self.stopped = True
+
+        if self.threading and self.thread.ident != self.threading.currentThread().ident:
+            # Called on a different thread than started us: we can't unhook
+            # ourselves, but we've set the flag that we should stop, so we
+            # won't do any more tracing.
+            #self.log("~", "stopping on different threads")
+            return
+
+        if self.warn:
+            # PyPy clears the trace function before running atexit functions,
+            # so don't warn if we are in atexit on PyPy and the trace function
+            # has changed to None.
+            dont_warn = (env.PYPY and env.PYPYVERSION >= (5, 4) and self.in_atexit and tf is None)
+            if (not dont_warn) and tf != self._trace:   # pylint: disable=comparison-with-callable
+                self.warn(
+                    "Trace function changed, measurement is likely wrong: %r" % (tf,),
+                    slug="trace-changed",
+                )
+
+    def activity(self):
+        """Has there been any activity?"""
+        return self._activity
+
+    def reset_activity(self):
+        """Reset the activity() flag."""
+        self._activity = False
+
+    def get_stats(self):
+        """Return a dictionary of statistics, or None."""
+        return None
diff --git a/contrib/python/coverage/py3/coverage/report.py b/contrib/python/coverage/py3/coverage/report.py
new file mode 100644
index 0000000000..64678ff95d
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/report.py
@@ -0,0 +1,86 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Reporter foundation for coverage.py."""
+import sys
+
+from coverage import env
+from coverage.files import prep_patterns, FnmatchMatcher
+from coverage.misc import CoverageException, NoSource, NotPython, ensure_dir_for_file, file_be_gone
+
+
+def render_report(output_path, reporter, morfs):
+    """Run the provided reporter ensuring any required setup and cleanup is done
+
+    At a high level this method ensures the output file is ready to be written to. Then writes the
+    report to it. Then closes the file and deletes any garbage created if necessary.
+    """
+    file_to_close = None
+    delete_file = False
+    if output_path:
+        if output_path == '-':
+            outfile = sys.stdout
+        else:
+            # Ensure that the output directory is created; done here
+            # because this report pre-opens the output file.
+            # HTMLReport does this using the Report plumbing because
+            # its task is more complex, being multiple files.
+            ensure_dir_for_file(output_path)
+            open_kwargs = {}
+            if env.PY3:
+                open_kwargs['encoding'] = 'utf8'
+            outfile = open(output_path, "w", **open_kwargs)
+            file_to_close = outfile
+    try:
+        return reporter.report(morfs, outfile=outfile)
+    except CoverageException:
+        delete_file = True
+        raise
+    finally:
+        if file_to_close:
+            file_to_close.close()
+            if delete_file:
+                file_be_gone(output_path)
+
+
+def get_analysis_to_report(coverage, morfs):
+    """Get the files to report on.
+
+    For each morf in `morfs`, if it should be reported on (based on the omit
+    and include configuration options), yield a pair, the `FileReporter` and
+    `Analysis` for the morf.
+
+    """
+    file_reporters = coverage._get_file_reporters(morfs)
+    config = coverage.config
+
+    if config.report_include:
+        matcher = FnmatchMatcher(prep_patterns(config.report_include))
+        file_reporters = [fr for fr in file_reporters if matcher.match(fr.filename)]
+
+    if config.report_omit:
+        matcher = FnmatchMatcher(prep_patterns(config.report_omit))
+        file_reporters = [fr for fr in file_reporters if not matcher.match(fr.filename)]
+
+    if not file_reporters:
+        raise CoverageException("No data to report.")
+
+    for fr in sorted(file_reporters):
+        try:
+            analysis = coverage._analyze(fr)
+        except NoSource:
+            if not config.ignore_errors:
+                raise
+        except NotPython:
+            # Only report errors for .py files, and only if we didn't
+            # explicitly suppress those errors.
+            # NotPython is only raised by PythonFileReporter, which has a
+            # should_be_python() method.
+            if fr.should_be_python():
+                if config.ignore_errors:
+                    msg = "Couldn't parse Python file '{}'".format(fr.filename)
+                    coverage._warn(msg, slug="couldnt-parse")
+                else:
+                    raise
+        else:
+            yield (fr, analysis)
diff --git a/contrib/python/coverage/py3/coverage/results.py b/contrib/python/coverage/py3/coverage/results.py
new file mode 100644
index 0000000000..4916864df3
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/results.py
@@ -0,0 +1,343 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Results of coverage measurement."""
+
+import collections
+
+from coverage.backward import iitems
+from coverage.debug import SimpleReprMixin
+from coverage.misc import contract, CoverageException, nice_pair
+
+
+class Analysis(object):
+    """The results of analyzing a FileReporter."""
+
+    def __init__(self, data, file_reporter, file_mapper):
+        self.data = data
+        self.file_reporter = file_reporter
+        self.filename = file_mapper(self.file_reporter.filename)
+        self.statements = self.file_reporter.lines()
+        self.excluded = self.file_reporter.excluded_lines()
+
+        # Identify missing statements.
+        executed = self.data.lines(self.filename) or []
+        executed = self.file_reporter.translate_lines(executed)
+        self.executed = executed
+        self.missing = self.statements - self.executed
+
+        if self.data.has_arcs():
+            self._arc_possibilities = sorted(self.file_reporter.arcs())
+            self.exit_counts = self.file_reporter.exit_counts()
+            self.no_branch = self.file_reporter.no_branch_lines()
+            n_branches = self._total_branches()
+            mba = self.missing_branch_arcs()
+            n_partial_branches = sum(len(v) for k,v in iitems(mba) if k not in self.missing)
+            n_missing_branches = sum(len(v) for k,v in iitems(mba))
+        else:
+            self._arc_possibilities = []
+            self.exit_counts = {}
+            self.no_branch = set()
+            n_branches = n_partial_branches = n_missing_branches = 0
+
+        self.numbers = Numbers(
+            n_files=1,
+            n_statements=len(self.statements),
+            n_excluded=len(self.excluded),
+            n_missing=len(self.missing),
+            n_branches=n_branches,
+            n_partial_branches=n_partial_branches,
+            n_missing_branches=n_missing_branches,
+        )
+
+    def missing_formatted(self, branches=False):
+        """The missing line numbers, formatted nicely.
+
+        Returns a string like "1-2, 5-11, 13-14".
+
+        If `branches` is true, includes the missing branch arcs also.
+
+        """
+        if branches and self.has_arcs():
+            arcs = iitems(self.missing_branch_arcs())
+        else:
+            arcs = None
+
+        return format_lines(self.statements, self.missing, arcs=arcs)
+
+    def has_arcs(self):
+        """Were arcs measured in this result?"""
+        return self.data.has_arcs()
+
+    @contract(returns='list(tuple(int, int))')
+    def arc_possibilities(self):
+        """Returns a sorted list of the arcs in the code."""
+        return self._arc_possibilities
+
+    @contract(returns='list(tuple(int, int))')
+    def arcs_executed(self):
+        """Returns a sorted list of the arcs actually executed in the code."""
+        executed = self.data.arcs(self.filename) or []
+        executed = self.file_reporter.translate_arcs(executed)
+        return sorted(executed)
+
+    @contract(returns='list(tuple(int, int))')
+    def arcs_missing(self):
+        """Returns a sorted list of the arcs in the code not executed."""
+        possible = self.arc_possibilities()
+        executed = self.arcs_executed()
+        missing = (
+            p for p in possible
+                if p not in executed
+                    and p[0] not in self.no_branch
+        )
+        return sorted(missing)
+
+    @contract(returns='list(tuple(int, int))')
+    def arcs_unpredicted(self):
+        """Returns a sorted list of the executed arcs missing from the code."""
+        possible = self.arc_possibilities()
+        executed = self.arcs_executed()
+        # Exclude arcs here which connect a line to itself.  They can occur
+        # in executed data in some cases.  This is where they can cause
+        # trouble, and here is where it's the least burden to remove them.
+        # Also, generators can somehow cause arcs from "enter" to "exit", so
+        # make sure we have at least one positive value.
+        unpredicted = (
+            e for e in executed
+                if e not in possible
+                    and e[0] != e[1]
+                    and (e[0] > 0 or e[1] > 0)
+        )
+        return sorted(unpredicted)
+
+    def _branch_lines(self):
+        """Returns a list of line numbers that have more than one exit."""
+        return [l1 for l1,count in iitems(self.exit_counts) if count > 1]
+
+    def _total_branches(self):
+        """How many total branches are there?"""
+        return sum(count for count in self.exit_counts.values() if count > 1)
+
+    @contract(returns='dict(int: list(int))')
+    def missing_branch_arcs(self):
+        """Return arcs that weren't executed from branch lines.
+
+        Returns {l1:[l2a,l2b,...], ...}
+
+        """
+        missing = self.arcs_missing()
+        branch_lines = set(self._branch_lines())
+        mba = collections.defaultdict(list)
+        for l1, l2 in missing:
+            if l1 in branch_lines:
+                mba[l1].append(l2)
+        return mba
+
+    @contract(returns='dict(int: tuple(int, int))')
+    def branch_stats(self):
+        """Get stats about branches.
+
+        Returns a dict mapping line numbers to a tuple:
+        (total_exits, taken_exits).
+        """
+
+        missing_arcs = self.missing_branch_arcs()
+        stats = {}
+        for lnum in self._branch_lines():
+            exits = self.exit_counts[lnum]
+            missing = len(missing_arcs[lnum])
+            stats[lnum] = (exits, exits - missing)
+        return stats
+
+
+class Numbers(SimpleReprMixin):
+    """The numerical results of measuring coverage.
+
+    This holds the basic statistics from `Analysis`, and is used to roll
+    up statistics across files.
+
+    """
+    # A global to determine the precision on coverage percentages, the number
+    # of decimal places.
+    _precision = 0
+    _near0 = 1.0              # These will change when _precision is changed.
+    _near100 = 99.0
+
+    def __init__(self, n_files=0, n_statements=0, n_excluded=0, n_missing=0,
+                    n_branches=0, n_partial_branches=0, n_missing_branches=0
+                    ):
+        self.n_files = n_files
+        self.n_statements = n_statements
+        self.n_excluded = n_excluded
+        self.n_missing = n_missing
+        self.n_branches = n_branches
+        self.n_partial_branches = n_partial_branches
+        self.n_missing_branches = n_missing_branches
+
+    def init_args(self):
+        """Return a list for __init__(*args) to recreate this object."""
+        return [
+            self.n_files, self.n_statements, self.n_excluded, self.n_missing,
+            self.n_branches, self.n_partial_branches, self.n_missing_branches,
+        ]
+
+    @classmethod
+    def set_precision(cls, precision):
+        """Set the number of decimal places used to report percentages."""
+        assert 0 <= precision < 10
+        cls._precision = precision
+        cls._near0 = 1.0 / 10**precision
+        cls._near100 = 100.0 - cls._near0
+
+    @property
+    def n_executed(self):
+        """Returns the number of executed statements."""
+        return self.n_statements - self.n_missing
+
+    @property
+    def n_executed_branches(self):
+        """Returns the number of executed branches."""
+        return self.n_branches - self.n_missing_branches
+
+    @property
+    def pc_covered(self):
+        """Returns a single percentage value for coverage."""
+        if self.n_statements > 0:
+            numerator, denominator = self.ratio_covered
+            pc_cov = (100.0 * numerator) / denominator
+        else:
+            pc_cov = 100.0
+        return pc_cov
+
+    @property
+    def pc_covered_str(self):
+        """Returns the percent covered, as a string, without a percent sign.
+
+        Note that "0" is only returned when the value is truly zero, and "100"
+        is only returned when the value is truly 100.  Rounding can never
+        result in either "0" or "100".
+
+        """
+        pc = self.pc_covered
+        if 0 < pc < self._near0:
+            pc = self._near0
+        elif self._near100 < pc < 100:
+            pc = self._near100
+        else:
+            pc = round(pc, self._precision)
+        return "%.*f" % (self._precision, pc)
+
+    @classmethod
+    def pc_str_width(cls):
+        """How many characters wide can pc_covered_str be?"""
+        width = 3   # "100"
+        if cls._precision > 0:
+            width += 1 + cls._precision
+        return width
+
+    @property
+    def ratio_covered(self):
+        """Return a numerator and denominator for the coverage ratio."""
+        numerator = self.n_executed + self.n_executed_branches
+        denominator = self.n_statements + self.n_branches
+        return numerator, denominator
+
+    def __add__(self, other):
+        nums = Numbers()
+        nums.n_files = self.n_files + other.n_files
+        nums.n_statements = self.n_statements + other.n_statements
+        nums.n_excluded = self.n_excluded + other.n_excluded
+        nums.n_missing = self.n_missing + other.n_missing
+        nums.n_branches = self.n_branches + other.n_branches
+        nums.n_partial_branches = (
+            self.n_partial_branches + other.n_partial_branches
+            )
+        nums.n_missing_branches = (
+            self.n_missing_branches + other.n_missing_branches
+            )
+        return nums
+
+    def __radd__(self, other):
+        # Implementing 0+Numbers allows us to sum() a list of Numbers.
+        if other == 0:
+            return self
+        return NotImplemented       # pragma: not covered (we never call it this way)
+
+
+def _line_ranges(statements, lines):
+    """Produce a list of ranges for `format_lines`."""
+    statements = sorted(statements)
+    lines = sorted(lines)
+
+    pairs = []
+    start = None
+    lidx = 0
+    for stmt in statements:
+        if lidx >= len(lines):
+            break
+        if stmt == lines[lidx]:
+            lidx += 1
+            if not start:
+                start = stmt
+            end = stmt
+        elif start:
+            pairs.append((start, end))
+            start = None
+    if start:
+        pairs.append((start, end))
+    return pairs
+
+
+def format_lines(statements, lines, arcs=None):
+    """Nicely format a list of line numbers.
+
+    Format a list of line numbers for printing by coalescing groups of lines as
+    long as the lines represent consecutive statements.  This will coalesce
+    even if there are gaps between statements.
+
+    For example, if `statements` is [1,2,3,4,5,10,11,12,13,14] and
+    `lines` is [1,2,5,10,11,13,14] then the result will be "1-2, 5-11, 13-14".
+
+    Both `lines` and `statements` can be any iterable. All of the elements of
+    `lines` must be in `statements`, and all of the values must be positive
+    integers.
+
+    If `arcs` is provided, they are (start,[end,end,end]) pairs that will be
+    included in the output as long as start isn't in `lines`.
+
+    """
+    line_items = [(pair[0], nice_pair(pair)) for pair in _line_ranges(statements, lines)]
+    if arcs:
+        line_exits = sorted(arcs)
+        for line, exits in line_exits:
+            for ex in sorted(exits):
+                if line not in lines and ex not in lines:
+                    dest = (ex if ex > 0 else "exit")
+                    line_items.append((line, "%d->%s" % (line, dest)))
+
+    ret = ', '.join(t[-1] for t in sorted(line_items))
+    return ret
+
+
+@contract(total='number', fail_under='number', precision=int, returns=bool)
+def should_fail_under(total, fail_under, precision):
+    """Determine if a total should fail due to fail-under.
+
+    `total` is a float, the coverage measurement total. `fail_under` is the
+    fail_under setting to compare with. `precision` is the number of digits
+    to consider after the decimal point.
+
+    Returns True if the total should fail.
+
+    """
+    # We can never achieve higher than 100% coverage, or less than zero.
+    if not (0 <= fail_under <= 100.0):
+        msg = "fail_under={} is invalid. Must be between 0 and 100.".format(fail_under)
+        raise CoverageException(msg)
+
+    # Special case for fail_under=100, it must really be 100.
+    if fail_under == 100.0 and total != 100.0:
+        return True
+
+    return round(total, precision) < fail_under
diff --git a/contrib/python/coverage/py3/coverage/sqldata.py b/contrib/python/coverage/py3/coverage/sqldata.py
new file mode 100644
index 0000000000..a150fdfd0f
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/sqldata.py
@@ -0,0 +1,1123 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Sqlite coverage data."""
+
+# TODO: factor out dataop debugging to a wrapper class?
+# TODO: make sure all dataop debugging is in place somehow
+
+import collections
+import datetime
+import glob
+import itertools
+import os
+import re
+import sqlite3
+import sys
+import zlib
+
+from coverage import env
+from coverage.backward import get_thread_id, iitems, to_bytes, to_string
+from coverage.debug import NoDebugging, SimpleReprMixin, clipped_repr
+from coverage.files import PathAliases
+from coverage.misc import CoverageException, contract, file_be_gone, filename_suffix, isolate_module
+from coverage.numbits import numbits_to_nums, numbits_union, nums_to_numbits
+from coverage.version import __version__
+
+os = isolate_module(os)
+
+# If you change the schema, increment the SCHEMA_VERSION, and update the
+# docs in docs/dbschema.rst also.
+
+SCHEMA_VERSION = 7
+
+# Schema versions:
+# 1: Released in 5.0a2
+# 2: Added contexts in 5.0a3.
+# 3: Replaced line table with line_map table.
+# 4: Changed line_map.bitmap to line_map.numbits.
+# 5: Added foreign key declarations.
+# 6: Key-value in meta.
+# 7: line_map -> line_bits
+
+SCHEMA = """\
+CREATE TABLE coverage_schema (
+    -- One row, to record the version of the schema in this db.
+    version integer
+);
+
+CREATE TABLE meta (
+    -- Key-value pairs, to record metadata about the data
+    key text,
+    value text,
+    unique (key)
+    -- Keys:
+    --  'has_arcs' boolean      -- Is this data recording branches?
+    --  'sys_argv' text         -- The coverage command line that recorded the data.
+    --  'version' text          -- The version of coverage.py that made the file.
+    --  'when' text             -- Datetime when the file was created.
+);
+
+CREATE TABLE file (
+    -- A row per file measured.
+    id integer primary key,
+    path text,
+    unique (path)
+);
+
+CREATE TABLE context (
+    -- A row per context measured.
+    id integer primary key,
+    context text,
+    unique (context)
+);
+
+CREATE TABLE line_bits (
+    -- If recording lines, a row per context per file executed.
+    -- All of the line numbers for that file/context are in one numbits.
+    file_id integer,            -- foreign key to `file`.
+    context_id integer,         -- foreign key to `context`.
+    numbits blob,               -- see the numbits functions in coverage.numbits
+    foreign key (file_id) references file (id),
+    foreign key (context_id) references context (id),
+    unique (file_id, context_id)
+);
+
+CREATE TABLE arc (
+    -- If recording branches, a row per context per from/to line transition executed.
+    file_id integer,            -- foreign key to `file`.
+    context_id integer,         -- foreign key to `context`.
+    fromno integer,             -- line number jumped from.
+    tono integer,               -- line number jumped to.
+    foreign key (file_id) references file (id),
+    foreign key (context_id) references context (id),
+    unique (file_id, context_id, fromno, tono)
+);
+
+CREATE TABLE tracer (
+    -- A row per file indicating the tracer used for that file.
+    file_id integer primary key,
+    tracer text,
+    foreign key (file_id) references file (id)
+);
+"""
+
+class CoverageData(SimpleReprMixin):
+    """Manages collected coverage data, including file storage.
+
+    This class is the public supported API to the data that coverage.py
+    collects during program execution.  It includes information about what code
+    was executed. It does not include information from the analysis phase, to
+    determine what lines could have been executed, or what lines were not
+    executed.
+
+    .. note::
+
+        The data file is currently a SQLite database file, with a
+        :ref:`documented schema <dbschema>`. The schema is subject to change
+        though, so be careful about querying it directly. Use this API if you
+        can to isolate yourself from changes.
+
+    There are a number of kinds of data that can be collected:
+
+    * **lines**: the line numbers of source lines that were executed.
+      These are always available.
+
+    * **arcs**: pairs of source and destination line numbers for transitions
+      between source lines.  These are only available if branch coverage was
+      used.
+
+    * **file tracer names**: the module names of the file tracer plugins that
+      handled each file in the data.
+
+    Lines, arcs, and file tracer names are stored for each source file. File
+    names in this API are case-sensitive, even on platforms with
+    case-insensitive file systems.
+
+    A data file either stores lines, or arcs, but not both.
+
+    A data file is associated with the data when the :class:`CoverageData`
+    is created, using the parameters `basename`, `suffix`, and `no_disk`. The
+    base name can be queried with :meth:`base_filename`, and the actual file
+    name being used is available from :meth:`data_filename`.
+
+    To read an existing coverage.py data file, use :meth:`read`.  You can then
+    access the line, arc, or file tracer data with :meth:`lines`, :meth:`arcs`,
+    or :meth:`file_tracer`.
+
+    The :meth:`has_arcs` method indicates whether arc data is available.  You
+    can get a set of the files in the data with :meth:`measured_files`.  As
+    with most Python containers, you can determine if there is any data at all
+    by using this object as a boolean value.
+
+    The contexts for each line in a file can be read with
+    :meth:`contexts_by_lineno`.
+
+    To limit querying to certain contexts, use :meth:`set_query_context` or
+    :meth:`set_query_contexts`. These will narrow the focus of subsequent
+    :meth:`lines`, :meth:`arcs`, and :meth:`contexts_by_lineno` calls. The set
+    of all measured context names can be retrieved with
+    :meth:`measured_contexts`.
+
+    Most data files will be created by coverage.py itself, but you can use
+    methods here to create data files if you like.  The :meth:`add_lines`,
+    :meth:`add_arcs`, and :meth:`add_file_tracers` methods add data, in ways
+    that are convenient for coverage.py.
+
+    To record data for contexts, use :meth:`set_context` to set a context to
+    be used for subsequent :meth:`add_lines` and :meth:`add_arcs` calls.
+
+    To add a source file without any measured data, use :meth:`touch_file`,
+    or :meth:`touch_files` for a list of such files.
+
+    Write the data to its file with :meth:`write`.
+
+    You can clear the data in memory with :meth:`erase`.  Two data collections
+    can be combined by using :meth:`update` on one :class:`CoverageData`,
+    passing it the other.
+
+    Data in a :class:`CoverageData` can be serialized and deserialized with
+    :meth:`dumps` and :meth:`loads`.
+
+    """
+
+    def __init__(self, basename=None, suffix=None, no_disk=False, warn=None, debug=None):
+        """Create a :class:`CoverageData` object to hold coverage-measured data.
+
+        Arguments:
+            basename (str): the base name of the data file, defaulting to
+                ".coverage".
+            suffix (str or bool): has the same meaning as the `data_suffix`
+                argument to :class:`coverage.Coverage`.
+            no_disk (bool): if True, keep all data in memory, and don't
+                write any disk file.
+            warn: a warning callback function, accepting a warning message
+                argument.
+            debug: a `DebugControl` object (optional)
+
+        """
+        self._no_disk = no_disk
+        self._basename = os.path.abspath(basename or ".coverage")
+        self._suffix = suffix
+        self._warn = warn
+        self._debug = debug or NoDebugging()
+
+        self._choose_filename()
+        self._file_map = {}
+        # Maps thread ids to SqliteDb objects.
+        self._dbs = {}
+        self._pid = os.getpid()
+
+        # Are we in sync with the data file?
+        self._have_used = False
+
+        self._has_lines = False
+        self._has_arcs = False
+
+        self._current_context = None
+        self._current_context_id = None
+        self._query_context_ids = None
+
+    def _choose_filename(self):
+        """Set self._filename based on inited attributes."""
+        if self._no_disk:
+            self._filename = ":memory:"
+        else:
+            self._filename = self._basename
+            suffix = filename_suffix(self._suffix)
+            if suffix:
+                self._filename += "." + suffix
+
+    def _reset(self):
+        """Reset our attributes."""
+        if self._dbs:
+            for db in self._dbs.values():
+                db.close()
+        self._dbs = {}
+        self._file_map = {}
+        self._have_used = False
+        self._current_context_id = None
+
+    def _create_db(self):
+        """Create a db file that doesn't exist yet.
+
+        Initializes the schema and certain metadata.
+        """
+        if self._debug.should('dataio'):
+            self._debug.write("Creating data file {!r}".format(self._filename))
+        self._dbs[get_thread_id()] = db = SqliteDb(self._filename, self._debug)
+        with db:
+            db.executescript(SCHEMA)
+            db.execute("insert into coverage_schema (version) values (?)", (SCHEMA_VERSION,))
+            db.executemany(
+                "insert into meta (key, value) values (?, ?)",
+                [
+                    ('sys_argv', str(getattr(sys, 'argv', None))),
+                    ('version', __version__),
+                    ('when', datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')),
+                ]
+            )
+
+    def _open_db(self):
+        """Open an existing db file, and read its metadata."""
+        if self._debug.should('dataio'):
+            self._debug.write("Opening data file {!r}".format(self._filename))
+        self._dbs[get_thread_id()] = SqliteDb(self._filename, self._debug)
+        self._read_db()
+
+    def _read_db(self):
+        """Read the metadata from a database so that we are ready to use it."""
+        with self._dbs[get_thread_id()] as db:
+            try:
+                schema_version, = db.execute_one("select version from coverage_schema")
+            except Exception as exc:
+                raise CoverageException(
+                    "Data file {!r} doesn't seem to be a coverage data file: {}".format(
+                        self._filename, exc
+                    )
+                )
+            else:
+                if schema_version != SCHEMA_VERSION:
+                    raise CoverageException(
+                        "Couldn't use data file {!r}: wrong schema: {} instead of {}".format(
+                            self._filename, schema_version, SCHEMA_VERSION
+                        )
+                    )
+
+            for row in db.execute("select value from meta where key = 'has_arcs'"):
+                self._has_arcs = bool(int(row[0]))
+                self._has_lines = not self._has_arcs
+
+            for path, file_id in db.execute("select path, id from file"):
+                self._file_map[path] = file_id
+
+    def _connect(self):
+        """Get the SqliteDb object to use."""
+        if get_thread_id() not in self._dbs:
+            if os.path.exists(self._filename):
+                self._open_db()
+            else:
+                self._create_db()
+        return self._dbs[get_thread_id()]
+
+    def __nonzero__(self):
+        if (get_thread_id() not in self._dbs and not os.path.exists(self._filename)):
+            return False
+        try:
+            with self._connect() as con:
+                rows = con.execute("select * from file limit 1")
+                return bool(list(rows))
+        except CoverageException:
+            return False
+
+    __bool__ = __nonzero__
+
+    @contract(returns='bytes')
+    def dumps(self):
+        """Serialize the current data to a byte string.
+
+        The format of the serialized data is not documented. It is only
+        suitable for use with :meth:`loads` in the same version of
+        coverage.py.
+
+        Returns:
+            A byte string of serialized data.
+
+        .. versionadded:: 5.0
+
+        """
+        if self._debug.should('dataio'):
+            self._debug.write("Dumping data from data file {!r}".format(self._filename))
+        with self._connect() as con:
+            return b'z' + zlib.compress(to_bytes(con.dump()))
+
+    @contract(data='bytes')
+    def loads(self, data):
+        """Deserialize data from :meth:`dumps`
+
+        Use with a newly-created empty :class:`CoverageData` object.  It's
+        undefined what happens if the object already has data in it.
+
+        Arguments:
+            data: A byte string of serialized data produced by :meth:`dumps`.
+
+        .. versionadded:: 5.0
+
+        """
+        if self._debug.should('dataio'):
+            self._debug.write("Loading data into data file {!r}".format(self._filename))
+        if data[:1] != b'z':
+            raise CoverageException(
+                "Unrecognized serialization: {!r} (head of {} bytes)".format(data[:40], len(data))
+                )
+        script = to_string(zlib.decompress(data[1:]))
+        self._dbs[get_thread_id()] = db = SqliteDb(self._filename, self._debug)
+        with db:
+            db.executescript(script)
+        self._read_db()
+        self._have_used = True
+
+    def _file_id(self, filename, add=False):
+        """Get the file id for `filename`.
+
+        If filename is not in the database yet, add it if `add` is True.
+        If `add` is not True, return None.
+        """
+        if filename not in self._file_map:
+            if add:
+                with self._connect() as con:
+                    cur = con.execute("insert or replace into file (path) values (?)", (filename,))
+                    self._file_map[filename] = cur.lastrowid
+        return self._file_map.get(filename)
+
+    def _context_id(self, context):
+        """Get the id for a context."""
+        assert context is not None
+        self._start_using()
+        with self._connect() as con:
+            row = con.execute_one("select id from context where context = ?", (context,))
+            if row is not None:
+                return row[0]
+            else:
+                return None
+
+    def set_context(self, context):
+        """Set the current context for future :meth:`add_lines` etc.
+
+        `context` is a str, the name of the context to use for the next data
+        additions.  The context persists until the next :meth:`set_context`.
+
+        .. versionadded:: 5.0
+
+        """
+        if self._debug.should('dataop'):
+            self._debug.write("Setting context: %r" % (context,))
+        self._current_context = context
+        self._current_context_id = None
+
+    def _set_context_id(self):
+        """Use the _current_context to set _current_context_id."""
+        context = self._current_context or ""
+        context_id = self._context_id(context)
+        if context_id is not None:
+            self._current_context_id = context_id
+        else:
+            with self._connect() as con:
+                cur = con.execute("insert into context (context) values (?)", (context,))
+                self._current_context_id = cur.lastrowid
+
+    def base_filename(self):
+        """The base filename for storing data.
+
+        .. versionadded:: 5.0
+
+        """
+        return self._basename
+
+    def data_filename(self):
+        """Where is the data stored?
+
+        .. versionadded:: 5.0
+
+        """
+        return self._filename
+
+    def add_lines(self, line_data):
+        """Add measured line data.
+
+        `line_data` is a dictionary mapping file names to dictionaries::
+
+            { filename: { lineno: None, ... }, ...}
+
+        """
+        if self._debug.should('dataop'):
+            self._debug.write("Adding lines: %d files, %d lines total" % (
+                len(line_data), sum(len(lines) for lines in line_data.values())
+            ))
+        self._start_using()
+        self._choose_lines_or_arcs(lines=True)
+        if not line_data:
+            return
+        with self._connect() as con:
+            self._set_context_id()
+            for filename, linenos in iitems(line_data):
+                linemap = nums_to_numbits(linenos)
+                file_id = self._file_id(filename, add=True)
+                query = "select numbits from line_bits where file_id = ? and context_id = ?"
+                existing = list(con.execute(query, (file_id, self._current_context_id)))
+                if existing:
+                    linemap = numbits_union(linemap, existing[0][0])
+
+                con.execute(
+                    "insert or replace into line_bits "
+                    " (file_id, context_id, numbits) values (?, ?, ?)",
+                    (file_id, self._current_context_id, linemap),
+                )
+
+    def add_arcs(self, arc_data):
+        """Add measured arc data.
+
+        `arc_data` is a dictionary mapping file names to dictionaries::
+
+            { filename: { (l1,l2): None, ... }, ...}
+
+        """
+        if self._debug.should('dataop'):
+            self._debug.write("Adding arcs: %d files, %d arcs total" % (
+                len(arc_data), sum(len(arcs) for arcs in arc_data.values())
+            ))
+        self._start_using()
+        self._choose_lines_or_arcs(arcs=True)
+        if not arc_data:
+            return
+        with self._connect() as con:
+            self._set_context_id()
+            for filename, arcs in iitems(arc_data):
+                file_id = self._file_id(filename, add=True)
+                data = [(file_id, self._current_context_id, fromno, tono) for fromno, tono in arcs]
+                con.executemany(
+                    "insert or ignore into arc "
+                    "(file_id, context_id, fromno, tono) values (?, ?, ?, ?)",
+                    data,
+                )
+
+    def _choose_lines_or_arcs(self, lines=False, arcs=False):
+        """Force the data file to choose between lines and arcs."""
+        assert lines or arcs
+        assert not (lines and arcs)
+        if lines and self._has_arcs:
+            raise CoverageException("Can't add line measurements to existing branch data")
+        if arcs and self._has_lines:
+            raise CoverageException("Can't add branch measurements to existing line data")
+        if not self._has_arcs and not self._has_lines:
+            self._has_lines = lines
+            self._has_arcs = arcs
+            with self._connect() as con:
+                con.execute(
+                    "insert into meta (key, value) values (?, ?)",
+                    ('has_arcs', str(int(arcs)))
+                )
+
+    def add_file_tracers(self, file_tracers):
+        """Add per-file plugin information.
+
+        `file_tracers` is { filename: plugin_name, ... }
+
+        """
+        if self._debug.should('dataop'):
+            self._debug.write("Adding file tracers: %d files" % (len(file_tracers),))
+        if not file_tracers:
+            return
+        self._start_using()
+        with self._connect() as con:
+            for filename, plugin_name in iitems(file_tracers):
+                file_id = self._file_id(filename)
+                if file_id is None:
+                    raise CoverageException(
+                        "Can't add file tracer data for unmeasured file '%s'" % (filename,)
+                    )
+
+                existing_plugin = self.file_tracer(filename)
+                if existing_plugin:
+                    if existing_plugin != plugin_name:
+                        raise CoverageException(
+                            "Conflicting file tracer name for '%s': %r vs %r" % (
+                                filename, existing_plugin, plugin_name,
+                            )
+                        )
+                elif plugin_name:
+                    con.execute(
+                        "insert into tracer (file_id, tracer) values (?, ?)",
+                        (file_id, plugin_name)
+                    )
+
+    def touch_file(self, filename, plugin_name=""):
+        """Ensure that `filename` appears in the data, empty if needed.
+
+        `plugin_name` is the name of the plugin responsible for this file. It is used
+        to associate the right filereporter, etc.
+        """
+        self.touch_files([filename], plugin_name)
+
+    def touch_files(self, filenames, plugin_name=""):
+        """Ensure that `filenames` appear in the data, empty if needed.
+
+        `plugin_name` is the name of the plugin responsible for these files. It is used
+        to associate the right filereporter, etc.
+        """
+        if self._debug.should('dataop'):
+            self._debug.write("Touching %r" % (filenames,))
+        self._start_using()
+        with self._connect(): # Use this to get one transaction.
+            if not self._has_arcs and not self._has_lines:
+                raise CoverageException("Can't touch files in an empty CoverageData")
+
+            for filename in filenames:
+                self._file_id(filename, add=True)
+                if plugin_name:
+                    # Set the tracer for this file
+                    self.add_file_tracers({filename: plugin_name})
+
+    def update(self, other_data, aliases=None):
+        """Update this data with data from several other :class:`CoverageData` instances.
+
+        If `aliases` is provided, it's a `PathAliases` object that is used to
+        re-map paths to match the local machine's.
+        """
+        if self._debug.should('dataop'):
+            self._debug.write("Updating with data from %r" % (
+                getattr(other_data, '_filename', '???'),
+            ))
+        if self._has_lines and other_data._has_arcs:
+            raise CoverageException("Can't combine arc data with line data")
+        if self._has_arcs and other_data._has_lines:
+            raise CoverageException("Can't combine line data with arc data")
+
+        aliases = aliases or PathAliases()
+
+        # Force the database we're writing to to exist before we start nesting
+        # contexts.
+        self._start_using()
+
+        # Collector for all arcs, lines and tracers
+        other_data.read()
+        with other_data._connect() as conn:
+            # Get files data.
+            cur = conn.execute('select path from file')
+            files = {path: aliases.map(path) for (path,) in cur}
+            cur.close()
+
+            # Get contexts data.
+            cur = conn.execute('select context from context')
+            contexts = [context for (context,) in cur]
+            cur.close()
+
+            # Get arc data.
+            cur = conn.execute(
+                'select file.path, context.context, arc.fromno, arc.tono '
+                'from arc '
+                'inner join file on file.id = arc.file_id '
+                'inner join context on context.id = arc.context_id'
+            )
+            arcs = [(files[path], context, fromno, tono) for (path, context, fromno, tono) in cur]
+            cur.close()
+
+            # Get line data.
+            cur = conn.execute(
+                'select file.path, context.context, line_bits.numbits '
+                'from line_bits '
+                'inner join file on file.id = line_bits.file_id '
+                'inner join context on context.id = line_bits.context_id'
+                )
+            lines = {
+                (files[path], context): numbits
+                for (path, context, numbits) in cur
+                }
+            cur.close()
+
+            # Get tracer data.
+            cur = conn.execute(
+                'select file.path, tracer '
+                'from tracer '
+                'inner join file on file.id = tracer.file_id'
+            )
+            tracers = {files[path]: tracer for (path, tracer) in cur}
+            cur.close()
+
+        with self._connect() as conn:
+            conn.con.isolation_level = 'IMMEDIATE'
+
+            # Get all tracers in the DB. Files not in the tracers are assumed
+            # to have an empty string tracer. Since Sqlite does not support
+            # full outer joins, we have to make two queries to fill the
+            # dictionary.
+            this_tracers = {path: '' for path, in conn.execute('select path from file')}
+            this_tracers.update({
+                aliases.map(path): tracer
+                for path, tracer in conn.execute(
+                    'select file.path, tracer from tracer '
+                    'inner join file on file.id = tracer.file_id'
+                )
+            })
+
+            # Create all file and context rows in the DB.
+            conn.executemany(
+                'insert or ignore into file (path) values (?)',
+                ((file,) for file in files.values())
+            )
+            file_ids = {
+                path: id
+                for id, path in conn.execute('select id, path from file')
+            }
+            conn.executemany(
+                'insert or ignore into context (context) values (?)',
+                ((context,) for context in contexts)
+            )
+            context_ids = {
+                context: id
+                for id, context in conn.execute('select id, context from context')
+            }
+
+            # Prepare tracers and fail, if a conflict is found.
+            # tracer_paths is used to ensure consistency over the tracer data
+            # and tracer_map tracks the tracers to be inserted.
+            tracer_map = {}
+            for path in files.values():
+                this_tracer = this_tracers.get(path)
+                other_tracer = tracers.get(path, '')
+                # If there is no tracer, there is always the None tracer.
+                if this_tracer is not None and this_tracer != other_tracer:
+                    raise CoverageException(
+                        "Conflicting file tracer name for '%s': %r vs %r" % (
+                            path, this_tracer, other_tracer
+                        )
+                    )
+                tracer_map[path] = other_tracer
+
+            # Prepare arc and line rows to be inserted by converting the file
+            # and context strings with integer ids. Then use the efficient
+            # `executemany()` to insert all rows at once.
+            arc_rows = (
+                (file_ids[file], context_ids[context], fromno, tono)
+                for file, context, fromno, tono in arcs
+            )
+
+            # Get line data.
+            cur = conn.execute(
+                'select file.path, context.context, line_bits.numbits '
+                'from line_bits '
+                'inner join file on file.id = line_bits.file_id '
+                'inner join context on context.id = line_bits.context_id'
+                )
+            for path, context, numbits in cur:
+                key = (aliases.map(path), context)
+                if key in lines:
+                    numbits = numbits_union(lines[key], numbits)
+                lines[key] = numbits
+            cur.close()
+
+            if arcs:
+                self._choose_lines_or_arcs(arcs=True)
+
+                # Write the combined data.
+                conn.executemany(
+                    'insert or ignore into arc '
+                    '(file_id, context_id, fromno, tono) values (?, ?, ?, ?)',
+                    arc_rows
+                )
+
+            if lines:
+                self._choose_lines_or_arcs(lines=True)
+                conn.execute("delete from line_bits")
+                conn.executemany(
+                    "insert into line_bits "
+                    "(file_id, context_id, numbits) values (?, ?, ?)",
+                    [
+                        (file_ids[file], context_ids[context], numbits)
+                        for (file, context), numbits in lines.items()
+                    ]
+                )
+            conn.executemany(
+                'insert or ignore into tracer (file_id, tracer) values (?, ?)',
+                ((file_ids[filename], tracer) for filename, tracer in tracer_map.items())
+            )
+
+        # Update all internal cache data.
+        self._reset()
+        self.read()
+
+    def erase(self, parallel=False):
+        """Erase the data in this object.
+
+        If `parallel` is true, then also deletes data files created from the
+        basename by parallel-mode.
+
+        """
+        self._reset()
+        if self._no_disk:
+            return
+        if self._debug.should('dataio'):
+            self._debug.write("Erasing data file {!r}".format(self._filename))
+        file_be_gone(self._filename)
+        if parallel:
+            data_dir, local = os.path.split(self._filename)
+            localdot = local + '.*'
+            pattern = os.path.join(os.path.abspath(data_dir), localdot)
+            for filename in glob.glob(pattern):
+                if self._debug.should('dataio'):
+                    self._debug.write("Erasing parallel data file {!r}".format(filename))
+                file_be_gone(filename)
+
+    def read(self):
+        """Start using an existing data file."""
+        with self._connect():       # TODO: doesn't look right
+            self._have_used = True
+
+    def write(self):
+        """Ensure the data is written to the data file."""
+        pass
+
+    def _start_using(self):
+        """Call this before using the database at all."""
+        if self._pid != os.getpid():
+            # Looks like we forked! Have to start a new data file.
+            self._reset()
+            self._choose_filename()
+            self._pid = os.getpid()
+        if not self._have_used:
+            self.erase()
+        self._have_used = True
+
+    def has_arcs(self):
+        """Does the database have arcs (True) or lines (False)."""
+        return bool(self._has_arcs)
+
+    def measured_files(self):
+        """A set of all files that had been measured."""
+        return set(self._file_map)
+
+    def measured_contexts(self):
+        """A set of all contexts that have been measured.
+
+        .. versionadded:: 5.0
+
+        """
+        self._start_using()
+        with self._connect() as con:
+            contexts = {row[0] for row in con.execute("select distinct(context) from context")}
+        return contexts
+
+    def file_tracer(self, filename):
+        """Get the plugin name of the file tracer for a file.
+
+        Returns the name of the plugin that handles this file.  If the file was
+        measured, but didn't use a plugin, then "" is returned.  If the file
+        was not measured, then None is returned.
+
+        """
+        self._start_using()
+        with self._connect() as con:
+            file_id = self._file_id(filename)
+            if file_id is None:
+                return None
+            row = con.execute_one("select tracer from tracer where file_id = ?", (file_id,))
+            if row is not None:
+                return row[0] or ""
+            return ""   # File was measured, but no tracer associated.
+
+    def set_query_context(self, context):
+        """Set a context for subsequent querying.
+
+        The next :meth:`lines`, :meth:`arcs`, or :meth:`contexts_by_lineno`
+        calls will be limited to only one context.  `context` is a string which
+        must match a context exactly.  If it does not, no exception is raised,
+        but queries will return no data.
+
+        .. versionadded:: 5.0
+
+        """
+        self._start_using()
+        with self._connect() as con:
+            cur = con.execute("select id from context where context = ?", (context,))
+            self._query_context_ids = [row[0] for row in cur.fetchall()]
+
+    def set_query_contexts(self, contexts):
+        """Set a number of contexts for subsequent querying.
+
+        The next :meth:`lines`, :meth:`arcs`, or :meth:`contexts_by_lineno`
+        calls will be limited to the specified contexts.  `contexts` is a list
+        of Python regular expressions.  Contexts will be matched using
+        :func:`re.search <python:re.search>`.  Data will be included in query
+        results if they are part of any of the contexts matched.
+
+        .. versionadded:: 5.0
+
+        """
+        self._start_using()
+        if contexts:
+            with self._connect() as con:
+                context_clause = ' or '.join(['context regexp ?'] * len(contexts))
+                cur = con.execute("select id from context where " + context_clause, contexts)
+                self._query_context_ids = [row[0] for row in cur.fetchall()]
+        else:
+            self._query_context_ids = None
+
+    def lines(self, filename):
+        """Get the list of lines executed for a file.
+
+        If the file was not measured, returns None.  A file might be measured,
+        and have no lines executed, in which case an empty list is returned.
+
+        If the file was executed, returns a list of integers, the line numbers
+        executed in the file. The list is in no particular order.
+
+        """
+        self._start_using()
+        if self.has_arcs():
+            arcs = self.arcs(filename)
+            if arcs is not None:
+                all_lines = itertools.chain.from_iterable(arcs)
+                return list({l for l in all_lines if l > 0})
+
+        with self._connect() as con:
+            file_id = self._file_id(filename)
+            if file_id is None:
+                return None
+            else:
+                query = "select numbits from line_bits where file_id = ?"
+                data = [file_id]
+                if self._query_context_ids is not None:
+                    ids_array = ', '.join('?' * len(self._query_context_ids))
+                    query += " and context_id in (" + ids_array + ")"
+                    data += self._query_context_ids
+                bitmaps = list(con.execute(query, data))
+                nums = set()
+                for row in bitmaps:
+                    nums.update(numbits_to_nums(row[0]))
+                return list(nums)
+
+    def arcs(self, filename):
+        """Get the list of arcs executed for a file.
+
+        If the file was not measured, returns None.  A file might be measured,
+        and have no arcs executed, in which case an empty list is returned.
+
+        If the file was executed, returns a list of 2-tuples of integers. Each
+        pair is a starting line number and an ending line number for a
+        transition from one line to another. The list is in no particular
+        order.
+
+        Negative numbers have special meaning.  If the starting line number is
+        -N, it represents an entry to the code object that starts at line N.
+        If the ending ling number is -N, it's an exit from the code object that
+        starts at line N.
+
+        """
+        self._start_using()
+        with self._connect() as con:
+            file_id = self._file_id(filename)
+            if file_id is None:
+                return None
+            else:
+                query = "select distinct fromno, tono from arc where file_id = ?"
+                data = [file_id]
+                if self._query_context_ids is not None:
+                    ids_array = ', '.join('?' * len(self._query_context_ids))
+                    query += " and context_id in (" + ids_array + ")"
+                    data += self._query_context_ids
+                arcs = con.execute(query, data)
+                return list(arcs)
+
+    def contexts_by_lineno(self, filename):
+        """Get the contexts for each line in a file.
+
+        Returns:
+            A dict mapping line numbers to a list of context names.
+
+        .. versionadded:: 5.0
+
+        """
+        lineno_contexts_map = collections.defaultdict(list)
+        self._start_using()
+        with self._connect() as con:
+            file_id = self._file_id(filename)
+            if file_id is None:
+                return lineno_contexts_map
+            if self.has_arcs():
+                query = (
+                    "select arc.fromno, arc.tono, context.context "
+                    "from arc, context "
+                    "where arc.file_id = ? and arc.context_id = context.id"
+                )
+                data = [file_id]
+                if self._query_context_ids is not None:
+                    ids_array = ', '.join('?' * len(self._query_context_ids))
+                    query += " and arc.context_id in (" + ids_array + ")"
+                    data += self._query_context_ids
+                for fromno, tono, context in con.execute(query, data):
+                    if context not in lineno_contexts_map[fromno]:
+                        lineno_contexts_map[fromno].append(context)
+                    if context not in lineno_contexts_map[tono]:
+                        lineno_contexts_map[tono].append(context)
+            else:
+                query = (
+                    "select l.numbits, c.context from line_bits l, context c "
+                    "where l.context_id = c.id "
+                    "and file_id = ?"
+                    )
+                data = [file_id]
+                if self._query_context_ids is not None:
+                    ids_array = ', '.join('?' * len(self._query_context_ids))
+                    query += " and l.context_id in (" + ids_array + ")"
+                    data += self._query_context_ids
+                for numbits, context in con.execute(query, data):
+                    for lineno in numbits_to_nums(numbits):
+                        lineno_contexts_map[lineno].append(context)
+        return lineno_contexts_map
+
+    @classmethod
+    def sys_info(cls):
+        """Our information for `Coverage.sys_info`.
+
+        Returns a list of (key, value) pairs.
+
+        """
+        with SqliteDb(":memory:", debug=NoDebugging()) as db:
+            temp_store = [row[0] for row in db.execute("pragma temp_store")]
+            compile_options = [row[0] for row in db.execute("pragma compile_options")]
+
+        return [
+            ('sqlite3_version', sqlite3.version),
+            ('sqlite3_sqlite_version', sqlite3.sqlite_version),
+            ('sqlite3_temp_store', temp_store),
+            ('sqlite3_compile_options', compile_options),
+        ]
+
+
+class SqliteDb(SimpleReprMixin):
+    """A simple abstraction over a SQLite database.
+
+    Use as a context manager, then you can use it like a
+    :class:`python:sqlite3.Connection` object::
+
+        with SqliteDb(filename, debug_control) as db:
+            db.execute("insert into schema (version) values (?)", (SCHEMA_VERSION,))
+
+    """
+    def __init__(self, filename, debug):
+        self.debug = debug if debug.should('sql') else None
+        self.filename = filename
+        self.nest = 0
+        self.con = None
+
+    def _connect(self):
+        """Connect to the db and do universal initialization."""
+        if self.con is not None:
+            return
+
+        # SQLite on Windows on py2 won't open a file if the filename argument
+        # has non-ascii characters in it.  Opening a relative file name avoids
+        # a problem if the current directory has non-ascii.
+        filename = self.filename
+        if env.WINDOWS and env.PY2:
+            try:
+                filename = os.path.relpath(self.filename)
+            except ValueError:
+                # ValueError can be raised under Windows when os.getcwd() returns a
+                # folder from a different drive than the drive of self.filename in
+                # which case we keep the original value of self.filename unchanged,
+                # hoping that we won't face the non-ascii directory problem.
+                pass
+
+        # It can happen that Python switches threads while the tracer writes
+        # data. The second thread will also try to write to the data,
+        # effectively causing a nested context. However, given the idempotent
+        # nature of the tracer operations, sharing a connection among threads
+        # is not a problem.
+        if self.debug:
+            self.debug.write("Connecting to {!r}".format(self.filename))
+        self.con = sqlite3.connect(filename, check_same_thread=False)
+        self.con.create_function('REGEXP', 2, _regexp)
+
+        # This pragma makes writing faster. It disables rollbacks, but we never need them.
+        # PyPy needs the .close() calls here, or sqlite gets twisted up:
+        # https://bitbucket.org/pypy/pypy/issues/2872/default-isolation-mode-is-different-on
+        self.execute("pragma journal_mode=off").close()
+        # This pragma makes writing faster.
+        self.execute("pragma synchronous=off").close()
+
+    def close(self):
+        """If needed, close the connection."""
+        if self.con is not None and self.filename != ":memory:":
+            self.con.close()
+            self.con = None
+
+    def __enter__(self):
+        if self.nest == 0:
+            self._connect()
+            self.con.__enter__()
+        self.nest += 1
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.nest -= 1
+        if self.nest == 0:
+            try:
+                self.con.__exit__(exc_type, exc_value, traceback)
+                self.close()
+            except Exception as exc:
+                if self.debug:
+                    self.debug.write("EXCEPTION from __exit__: {}".format(exc))
+                raise
+
+    def execute(self, sql, parameters=()):
+        """Same as :meth:`python:sqlite3.Connection.execute`."""
+        if self.debug:
+            tail = " with {!r}".format(parameters) if parameters else ""
+            self.debug.write("Executing {!r}{}".format(sql, tail))
+        try:
+            try:
+                return self.con.execute(sql, parameters)
+            except Exception:
+                # In some cases, an error might happen that isn't really an
+                # error.  Try again immediately.
+                # https://github.com/nedbat/coveragepy/issues/1010
+                return self.con.execute(sql, parameters)
+        except sqlite3.Error as exc:
+            msg = str(exc)
+            try:
+                # `execute` is the first thing we do with the database, so try
+                # hard to provide useful hints if something goes wrong now.
+                with open(self.filename, "rb") as bad_file:
+                    cov4_sig = b"!coverage.py: This is a private format"
+                    if bad_file.read(len(cov4_sig)) == cov4_sig:
+                        msg = (
+                            "Looks like a coverage 4.x data file. "
+                            "Are you mixing versions of coverage?"
+                        )
+            except Exception:
+                pass
+            if self.debug:
+                self.debug.write("EXCEPTION from execute: {}".format(msg))
+            raise CoverageException("Couldn't use data file {!r}: {}".format(self.filename, msg))
+
+    def execute_one(self, sql, parameters=()):
+        """Execute a statement and return the one row that results.
+
+        This is like execute(sql, parameters).fetchone(), except it is
+        correct in reading the entire result set.  This will raise an
+        exception if more than one row results.
+
+        Returns a row, or None if there were no rows.
+        """
+        rows = list(self.execute(sql, parameters))
+        if len(rows) == 0:
+            return None
+        elif len(rows) == 1:
+            return rows[0]
+        else:
+            raise CoverageException("Sql {!r} shouldn't return {} rows".format(sql, len(rows)))
+
+    def executemany(self, sql, data):
+        """Same as :meth:`python:sqlite3.Connection.executemany`."""
+        if self.debug:
+            data = list(data)
+            self.debug.write("Executing many {!r} with {} rows".format(sql, len(data)))
+        return self.con.executemany(sql, data)
+
+    def executescript(self, script):
+        """Same as :meth:`python:sqlite3.Connection.executescript`."""
+        if self.debug:
+            self.debug.write("Executing script with {} chars: {}".format(
+                len(script), clipped_repr(script, 100),
+            ))
+        self.con.executescript(script)
+
+    def dump(self):
+        """Return a multi-line string, the SQL dump of the database."""
+        return "\n".join(self.con.iterdump())
+
+
+def _regexp(text, pattern):
+    """A regexp function for SQLite."""
+    return re.search(text, pattern) is not None
diff --git a/contrib/python/coverage/py3/coverage/summary.py b/contrib/python/coverage/py3/coverage/summary.py
new file mode 100644
index 0000000000..65f8047006
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/summary.py
@@ -0,0 +1,152 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""Summary reporting"""
+
+import sys
+
+from coverage import env
+from coverage.report import get_analysis_to_report
+from coverage.results import Numbers
+from coverage.misc import CoverageException, output_encoding
+
+
+class SummaryReporter(object):
+    """A reporter for writing the summary report."""
+
+    def __init__(self, coverage):
+        self.coverage = coverage
+        self.config = self.coverage.config
+        self.branches = coverage.get_data().has_arcs()
+        self.outfile = None
+        self.fr_analysis = []
+        self.skipped_count = 0
+        self.empty_count = 0
+        self.total = Numbers()
+        self.fmt_err = u"%s   %s: %s"
+
+    def writeout(self, line):
+        """Write a line to the output, adding a newline."""
+        if env.PY2:
+            line = line.encode(output_encoding())
+        self.outfile.write(line.rstrip())
+        self.outfile.write("\n")
+
+    def report(self, morfs, outfile=None):
+        """Writes a report summarizing coverage statistics per module.
+
+        `outfile` is a file object to write the summary to. It must be opened
+        for native strings (bytes on Python 2, Unicode on Python 3).
+
+        """
+        self.outfile = outfile or sys.stdout
+
+        self.coverage.get_data().set_query_contexts(self.config.report_contexts)
+        for fr, analysis in get_analysis_to_report(self.coverage, morfs):
+            self.report_one_file(fr, analysis)
+
+        # Prepare the formatting strings, header, and column sorting.
+        max_name = max([len(fr.relative_filename()) for (fr, analysis) in self.fr_analysis] + [5])
+        fmt_name = u"%%- %ds  " % max_name
+        fmt_skip_covered = u"\n%s file%s skipped due to complete coverage."
+        fmt_skip_empty = u"\n%s empty file%s skipped."
+
+        header = (fmt_name % "Name") + u" Stmts   Miss"
+        fmt_coverage = fmt_name + u"%6d %6d"
+        if self.branches:
+            header += u" Branch BrPart"
+            fmt_coverage += u" %6d %6d"
+        width100 = Numbers.pc_str_width()
+        header += u"%*s" % (width100+4, "Cover")
+        fmt_coverage += u"%%%ds%%%%" % (width100+3,)
+        if self.config.show_missing:
+            header += u"   Missing"
+            fmt_coverage += u"   %s"
+        rule = u"-" * len(header)
+
+        column_order = dict(name=0, stmts=1, miss=2, cover=-1)
+        if self.branches:
+            column_order.update(dict(branch=3, brpart=4))
+
+        # Write the header
+        self.writeout(header)
+        self.writeout(rule)
+
+        # `lines` is a list of pairs, (line text, line values).  The line text
+        # is a string that will be printed, and line values is a tuple of
+        # sortable values.
+        lines = []
+
+        for (fr, analysis) in self.fr_analysis:
+            nums = analysis.numbers
+
+            args = (fr.relative_filename(), nums.n_statements, nums.n_missing)
+            if self.branches:
+                args += (nums.n_branches, nums.n_partial_branches)
+            args += (nums.pc_covered_str,)
+            if self.config.show_missing:
+                args += (analysis.missing_formatted(branches=True),)
+            text = fmt_coverage % args
+            # Add numeric percent coverage so that sorting makes sense.
+            args += (nums.pc_covered,)
+            lines.append((text, args))
+
+        # Sort the lines and write them out.
+        if getattr(self.config, 'sort', None):
+            sort_option = self.config.sort.lower()
+            reverse = False
+            if sort_option[0] == '-':
+                reverse = True
+                sort_option = sort_option[1:]
+            elif sort_option[0] == '+':
+                sort_option = sort_option[1:]
+
+            position = column_order.get(sort_option)
+            if position is None:
+                raise CoverageException("Invalid sorting option: {!r}".format(self.config.sort))
+            lines.sort(key=lambda l: (l[1][position], l[0]), reverse=reverse)
+
+        for line in lines:
+            self.writeout(line[0])
+
+        # Write a TOTAL line if we had at least one file.
+        if self.total.n_files > 0:
+            self.writeout(rule)
+            args = ("TOTAL", self.total.n_statements, self.total.n_missing)
+            if self.branches:
+                args += (self.total.n_branches, self.total.n_partial_branches)
+            args += (self.total.pc_covered_str,)
+            if self.config.show_missing:
+                args += ("",)
+            self.writeout(fmt_coverage % args)
+
+        # Write other final lines.
+        if not self.total.n_files and not self.skipped_count:
+            raise CoverageException("No data to report.")
+
+        if self.config.skip_covered and self.skipped_count:
+            self.writeout(
+                fmt_skip_covered % (self.skipped_count, 's' if self.skipped_count > 1 else '')
+                )
+        if self.config.skip_empty and self.empty_count:
+            self.writeout(
+                fmt_skip_empty % (self.empty_count, 's' if self.empty_count > 1 else '')
+                )
+
+        return self.total.n_statements and self.total.pc_covered
+
+    def report_one_file(self, fr, analysis):
+        """Report on just one file, the callback from report()."""
+        nums = analysis.numbers
+        self.total += nums
+
+        no_missing_lines = (nums.n_missing == 0)
+        no_missing_branches = (nums.n_partial_branches == 0)
+        if self.config.skip_covered and no_missing_lines and no_missing_branches:
+            # Don't report on 100% files.
+            self.skipped_count += 1
+        elif self.config.skip_empty and nums.n_statements == 0:
+            # Don't report on empty files.
+            self.empty_count += 1
+        else:
+            self.fr_analysis.append((fr, analysis))
diff --git a/contrib/python/coverage/py3/coverage/templite.py b/contrib/python/coverage/py3/coverage/templite.py
new file mode 100644
index 0000000000..7d4024e0af
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/templite.py
@@ -0,0 +1,302 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""A simple Python template renderer, for a nano-subset of Django syntax.
+
+For a detailed discussion of this code, see this chapter from 500 Lines:
+http://aosabook.org/en/500L/a-template-engine.html
+
+"""
+
+# Coincidentally named the same as http://code.activestate.com/recipes/496702/
+
+import re
+
+from coverage import env
+
+
+class TempliteSyntaxError(ValueError):
+    """Raised when a template has a syntax error."""
+    pass
+
+
+class TempliteValueError(ValueError):
+    """Raised when an expression won't evaluate in a template."""
+    pass
+
+
+class CodeBuilder(object):
+    """Build source code conveniently."""
+
+    def __init__(self, indent=0):
+        self.code = []
+        self.indent_level = indent
+
+    def __str__(self):
+        return "".join(str(c) for c in self.code)
+
+    def add_line(self, line):
+        """Add a line of source to the code.
+
+        Indentation and newline will be added for you, don't provide them.
+
+        """
+        self.code.extend([" " * self.indent_level, line, "\n"])
+
+    def add_section(self):
+        """Add a section, a sub-CodeBuilder."""
+        section = CodeBuilder(self.indent_level)
+        self.code.append(section)
+        return section
+
+    INDENT_STEP = 4      # PEP8 says so!
+
+    def indent(self):
+        """Increase the current indent for following lines."""
+        self.indent_level += self.INDENT_STEP
+
+    def dedent(self):
+        """Decrease the current indent for following lines."""
+        self.indent_level -= self.INDENT_STEP
+
+    def get_globals(self):
+        """Execute the code, and return a dict of globals it defines."""
+        # A check that the caller really finished all the blocks they started.
+        assert self.indent_level == 0
+        # Get the Python source as a single string.
+        python_source = str(self)
+        # Execute the source, defining globals, and return them.
+        global_namespace = {}
+        exec(python_source, global_namespace)
+        return global_namespace
+
+
+class Templite(object):
+    """A simple template renderer, for a nano-subset of Django syntax.
+
+    Supported constructs are extended variable access::
+
+        {{var.modifier.modifier|filter|filter}}
+
+    loops::
+
+        {% for var in list %}...{% endfor %}
+
+    and ifs::
+
+        {% if var %}...{% endif %}
+
+    Comments are within curly-hash markers::
+
+        {# This will be ignored #}
+
+    Lines between `{% joined %}` and `{% endjoined %}` will have lines stripped
+    and joined.  Be careful, this could join words together!
+
+    Any of these constructs can have a hyphen at the end (`-}}`, `-%}`, `-#}`),
+    which will collapse the whitespace following the tag.
+
+    Construct a Templite with the template text, then use `render` against a
+    dictionary context to create a finished string::
+
+        templite = Templite('''
+            <h1>Hello {{name|upper}}!</h1>
+            {% for topic in topics %}
+                <p>You are interested in {{topic}}.</p>
+            {% endif %}
+            ''',
+            {'upper': str.upper},
+        )
+        text = templite.render({
+            'name': "Ned",
+            'topics': ['Python', 'Geometry', 'Juggling'],
+        })
+
+    """
+    def __init__(self, text, *contexts):
+        """Construct a Templite with the given `text`.
+
+        `contexts` are dictionaries of values to use for future renderings.
+        These are good for filters and global values.
+
+        """
+        self.context = {}
+        for context in contexts:
+            self.context.update(context)
+
+        self.all_vars = set()
+        self.loop_vars = set()
+
+        # We construct a function in source form, then compile it and hold onto
+        # it, and execute it to render the template.
+        code = CodeBuilder()
+
+        code.add_line("def render_function(context, do_dots):")
+        code.indent()
+        vars_code = code.add_section()
+        code.add_line("result = []")
+        code.add_line("append_result = result.append")
+        code.add_line("extend_result = result.extend")
+        if env.PY2:
+            code.add_line("to_str = unicode")
+        else:
+            code.add_line("to_str = str")
+
+        buffered = []
+
+        def flush_output():
+            """Force `buffered` to the code builder."""
+            if len(buffered) == 1:
+                code.add_line("append_result(%s)" % buffered[0])
+            elif len(buffered) > 1:
+                code.add_line("extend_result([%s])" % ", ".join(buffered))
+            del buffered[:]
+
+        ops_stack = []
+
+        # Split the text to form a list of tokens.
+        tokens = re.split(r"(?s)({{.*?}}|{%.*?%}|{#.*?#})", text)
+
+        squash = in_joined = False
+
+        for token in tokens:
+            if token.startswith('{'):
+                start, end = 2, -2
+                squash = (token[-3] == '-')
+                if squash:
+                    end = -3
+
+                if token.startswith('{#'):
+                    # Comment: ignore it and move on.
+                    continue
+                elif token.startswith('{{'):
+                    # An expression to evaluate.
+                    expr = self._expr_code(token[start:end].strip())
+                    buffered.append("to_str(%s)" % expr)
+                else:
+                    # token.startswith('{%')
+                    # Action tag: split into words and parse further.
+                    flush_output()
+
+                    words = token[start:end].strip().split()
+                    if words[0] == 'if':
+                        # An if statement: evaluate the expression to determine if.
+                        if len(words) != 2:
+                            self._syntax_error("Don't understand if", token)
+                        ops_stack.append('if')
+                        code.add_line("if %s:" % self._expr_code(words[1]))
+                        code.indent()
+                    elif words[0] == 'for':
+                        # A loop: iterate over expression result.
+                        if len(words) != 4 or words[2] != 'in':
+                            self._syntax_error("Don't understand for", token)
+                        ops_stack.append('for')
+                        self._variable(words[1], self.loop_vars)
+                        code.add_line(
+                            "for c_%s in %s:" % (
+                                words[1],
+                                self._expr_code(words[3])
+                            )
+                        )
+                        code.indent()
+                    elif words[0] == 'joined':
+                        ops_stack.append('joined')
+                        in_joined = True
+                    elif words[0].startswith('end'):
+                        # Endsomething.  Pop the ops stack.
+                        if len(words) != 1:
+                            self._syntax_error("Don't understand end", token)
+                        end_what = words[0][3:]
+                        if not ops_stack:
+                            self._syntax_error("Too many ends", token)
+                        start_what = ops_stack.pop()
+                        if start_what != end_what:
+                            self._syntax_error("Mismatched end tag", end_what)
+                        if end_what == 'joined':
+                            in_joined = False
+                        else:
+                            code.dedent()
+                    else:
+                        self._syntax_error("Don't understand tag", words[0])
+            else:
+                # Literal content.  If it isn't empty, output it.
+                if in_joined:
+                    token = re.sub(r"\s*\n\s*", "", token.strip())
+                elif squash:
+                    token = token.lstrip()
+                if token:
+                    buffered.append(repr(token))
+
+        if ops_stack:
+            self._syntax_error("Unmatched action tag", ops_stack[-1])
+
+        flush_output()
+
+        for var_name in self.all_vars - self.loop_vars:
+            vars_code.add_line("c_%s = context[%r]" % (var_name, var_name))
+
+        code.add_line('return "".join(result)')
+        code.dedent()
+        self._render_function = code.get_globals()['render_function']
+
+    def _expr_code(self, expr):
+        """Generate a Python expression for `expr`."""
+        if "|" in expr:
+            pipes = expr.split("|")
+            code = self._expr_code(pipes[0])
+            for func in pipes[1:]:
+                self._variable(func, self.all_vars)
+                code = "c_%s(%s)" % (func, code)
+        elif "." in expr:
+            dots = expr.split(".")
+            code = self._expr_code(dots[0])
+            args = ", ".join(repr(d) for d in dots[1:])
+            code = "do_dots(%s, %s)" % (code, args)
+        else:
+            self._variable(expr, self.all_vars)
+            code = "c_%s" % expr
+        return code
+
+    def _syntax_error(self, msg, thing):
+        """Raise a syntax error using `msg`, and showing `thing`."""
+        raise TempliteSyntaxError("%s: %r" % (msg, thing))
+
+    def _variable(self, name, vars_set):
+        """Track that `name` is used as a variable.
+
+        Adds the name to `vars_set`, a set of variable names.
+
+        Raises an syntax error if `name` is not a valid name.
+
+        """
+        if not re.match(r"[_a-zA-Z][_a-zA-Z0-9]*$", name):
+            self._syntax_error("Not a valid name", name)
+        vars_set.add(name)
+
+    def render(self, context=None):
+        """Render this template by applying it to `context`.
+
+        `context` is a dictionary of values to use in this rendering.
+
+        """
+        # Make the complete context we'll use.
+        render_context = dict(self.context)
+        if context:
+            render_context.update(context)
+        return self._render_function(render_context, self._do_dots)
+
+    def _do_dots(self, value, *dots):
+        """Evaluate dotted expressions at run-time."""
+        for dot in dots:
+            try:
+                value = getattr(value, dot)
+            except AttributeError:
+                try:
+                    value = value[dot]
+                except (TypeError, KeyError):
+                    raise TempliteValueError(
+                        "Couldn't evaluate %r.%s" % (value, dot)
+                    )
+            if callable(value):
+                value = value()
+        return value
diff --git a/contrib/python/coverage/py3/coverage/tomlconfig.py b/contrib/python/coverage/py3/coverage/tomlconfig.py
new file mode 100644
index 0000000000..3ad581571c
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/tomlconfig.py
@@ -0,0 +1,168 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""TOML configuration support for coverage.py"""
+
+import io
+import os
+import re
+
+from coverage import env
+from coverage.backward import configparser, path_types
+from coverage.misc import CoverageException, substitute_variables
+
+# TOML support is an install-time extra option.
+try:
+    import toml
+except ImportError:         # pragma: not covered
+    toml = None
+
+
+class TomlDecodeError(Exception):
+    """An exception class that exists even when toml isn't installed."""
+    pass
+
+
+class TomlConfigParser:
+    """TOML file reading with the interface of HandyConfigParser."""
+
+    # This class has the same interface as config.HandyConfigParser, no
+    # need for docstrings.
+    # pylint: disable=missing-function-docstring
+
+    def __init__(self, our_file):
+        self.our_file = our_file
+        self.data = None
+
+    def read(self, filenames):
+        # RawConfigParser takes a filename or list of filenames, but we only
+        # ever call this with a single filename.
+        assert isinstance(filenames, path_types)
+        filename = filenames
+        if env.PYVERSION >= (3, 6):
+            filename = os.fspath(filename)
+
+        try:
+            with io.open(filename, encoding='utf-8') as fp:
+                toml_text = fp.read()
+        except IOError:
+            return []
+        if toml:
+            toml_text = substitute_variables(toml_text, os.environ)
+            try:
+                self.data = toml.loads(toml_text)
+            except toml.TomlDecodeError as err:
+                raise TomlDecodeError(*err.args)
+            return [filename]
+        else:
+            has_toml = re.search(r"^\[tool\.coverage\.", toml_text, flags=re.MULTILINE)
+            if self.our_file or has_toml:
+                # Looks like they meant to read TOML, but we can't read it.
+                msg = "Can't read {!r} without TOML support. Install with [toml] extra"
+                raise CoverageException(msg.format(filename))
+            return []
+
+    def _get_section(self, section):
+        """Get a section from the data.
+
+        Arguments:
+            section (str): A section name, which can be dotted.
+
+        Returns:
+            name (str): the actual name of the section that was found, if any,
+                or None.
+            data (str): the dict of data in the section, or None if not found.
+
+        """
+        prefixes = ["tool.coverage."]
+        if self.our_file:
+            prefixes.append("")
+        for prefix in prefixes:
+            real_section = prefix + section
+            parts = real_section.split(".")
+            try:
+                data = self.data[parts[0]]
+                for part in parts[1:]:
+                    data = data[part]
+            except KeyError:
+                continue
+            break
+        else:
+            return None, None
+        return real_section, data
+
+    def _get(self, section, option):
+        """Like .get, but returns the real section name and the value."""
+        name, data = self._get_section(section)
+        if data is None:
+            raise configparser.NoSectionError(section)
+        try:
+            return name, data[option]
+        except KeyError:
+            raise configparser.NoOptionError(option, name)
+
+    def has_option(self, section, option):
+        _, data = self._get_section(section)
+        if data is None:
+            return False
+        return option in data
+
+    def has_section(self, section):
+        name, _ = self._get_section(section)
+        return name
+
+    def options(self, section):
+        _, data = self._get_section(section)
+        if data is None:
+            raise configparser.NoSectionError(section)
+        return list(data.keys())
+
+    def get_section(self, section):
+        _, data = self._get_section(section)
+        return data
+
+    def get(self, section, option):
+        _, value = self._get(section, option)
+        return value
+
+    def _check_type(self, section, option, value, type_, type_desc):
+        if not isinstance(value, type_):
+            raise ValueError(
+                'Option {!r} in section {!r} is not {}: {!r}'
+                    .format(option, section, type_desc, value)
+            )
+
+    def getboolean(self, section, option):
+        name, value = self._get(section, option)
+        self._check_type(name, option, value, bool, "a boolean")
+        return value
+
+    def getlist(self, section, option):
+        name, values = self._get(section, option)
+        self._check_type(name, option, values, list, "a list")
+        return values
+
+    def getregexlist(self, section, option):
+        name, values = self._get(section, option)
+        self._check_type(name, option, values, list, "a list")
+        for value in values:
+            value = value.strip()
+            try:
+                re.compile(value)
+            except re.error as e:
+                raise CoverageException(
+                    "Invalid [%s].%s value %r: %s" % (name, option, value, e)
+                )
+        return values
+
+    def getint(self, section, option):
+        name, value = self._get(section, option)
+        self._check_type(name, option, value, int, "an integer")
+        return value
+
+    def getfloat(self, section, option):
+        name, value = self._get(section, option)
+        if isinstance(value, int):
+            value = float(value)
+        self._check_type(name, option, value, float, "a float")
+        return value
diff --git a/contrib/python/coverage/py3/coverage/version.py b/contrib/python/coverage/py3/coverage/version.py
new file mode 100644
index 0000000000..d141a11da3
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/version.py
@@ -0,0 +1,33 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""The version and URL for coverage.py"""
+# This file is exec'ed in setup.py, don't import anything!
+
+# Same semantics as sys.version_info.
+version_info = (5, 5, 0, "final", 0)
+
+
+def _make_version(major, minor, micro, releaselevel, serial):
+    """Create a readable version string from version_info tuple components."""
+    assert releaselevel in ['alpha', 'beta', 'candidate', 'final']
+    version = "%d.%d" % (major, minor)
+    if micro:
+        version += ".%d" % (micro,)
+    if releaselevel != 'final':
+        short = {'alpha': 'a', 'beta': 'b', 'candidate': 'rc'}[releaselevel]
+        version += "%s%d" % (short, serial)
+    return version
+
+
+def _make_url(major, minor, micro, releaselevel, serial):
+    """Make the URL people should start at for this version of coverage.py."""
+    url = "https://coverage.readthedocs.io"
+    if releaselevel != 'final':
+        # For pre-releases, use a version-specific URL.
+        url += "/en/coverage-" + _make_version(major, minor, micro, releaselevel, serial)
+    return url
+
+
+__version__ = _make_version(*version_info)
+__url__ = _make_url(*version_info)
diff --git a/contrib/python/coverage/py3/coverage/xmlreport.py b/contrib/python/coverage/py3/coverage/xmlreport.py
new file mode 100644
index 0000000000..6d012ee692
--- /dev/null
+++ b/contrib/python/coverage/py3/coverage/xmlreport.py
@@ -0,0 +1,234 @@
+# coding: utf-8
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
+
+"""XML reporting for coverage.py"""
+
+import os
+import os.path
+import sys
+import time
+import xml.dom.minidom
+
+from coverage import env
+from coverage import __url__, __version__, files
+from coverage.backward import iitems
+from coverage.misc import isolate_module
+from coverage.report import get_analysis_to_report
+
+os = isolate_module(os)
+
+
+DTD_URL = 'https://raw.githubusercontent.com/cobertura/web/master/htdocs/xml/coverage-04.dtd'
+
+
+def rate(hit, num):
+    """Return the fraction of `hit`/`num`, as a string."""
+    if num == 0:
+        return "1"
+    else:
+        return "%.4g" % (float(hit) / num)
+
+
+class XmlReporter(object):
+    """A reporter for writing Cobertura-style XML coverage results."""
+
+    def __init__(self, coverage):
+        self.coverage = coverage
+        self.config = self.coverage.config
+
+        self.source_paths = set()
+        if self.config.source:
+            for src in self.config.source:
+                if os.path.exists(src):
+                    if not self.config.relative_files:
+                        src = files.canonical_filename(src)
+                    self.source_paths.add(src)
+        self.packages = {}
+        self.xml_out = None
+
+    def report(self, morfs, outfile=None):
+        """Generate a Cobertura-compatible XML report for `morfs`.
+
+        `morfs` is a list of modules or file names.
+
+        `outfile` is a file object to write the XML to.
+
+        """
+        # Initial setup.
+        outfile = outfile or sys.stdout
+        has_arcs = self.coverage.get_data().has_arcs()
+
+        # Create the DOM that will store the data.
+        impl = xml.dom.minidom.getDOMImplementation()
+        self.xml_out = impl.createDocument(None, "coverage", None)
+
+        # Write header stuff.
+        xcoverage = self.xml_out.documentElement
+        xcoverage.setAttribute("version", __version__)
+        xcoverage.setAttribute("timestamp", str(int(time.time()*1000)))
+        xcoverage.appendChild(self.xml_out.createComment(
+            " Generated by coverage.py: %s " % __url__
+            ))
+        xcoverage.appendChild(self.xml_out.createComment(" Based on %s " % DTD_URL))
+
+        # Call xml_file for each file in the data.
+        for fr, analysis in get_analysis_to_report(self.coverage, morfs):
+            self.xml_file(fr, analysis, has_arcs)
+
+        xsources = self.xml_out.createElement("sources")
+        xcoverage.appendChild(xsources)
+
+        # Populate the XML DOM with the source info.
+        for path in sorted(self.source_paths):
+            xsource = self.xml_out.createElement("source")
+            xsources.appendChild(xsource)
+            txt = self.xml_out.createTextNode(path)
+            xsource.appendChild(txt)
+
+        lnum_tot, lhits_tot = 0, 0
+        bnum_tot, bhits_tot = 0, 0
+
+        xpackages = self.xml_out.createElement("packages")
+        xcoverage.appendChild(xpackages)
+
+        # Populate the XML DOM with the package info.
+        for pkg_name, pkg_data in sorted(iitems(self.packages)):
+            class_elts, lhits, lnum, bhits, bnum = pkg_data
+            xpackage = self.xml_out.createElement("package")
+            xpackages.appendChild(xpackage)
+            xclasses = self.xml_out.createElement("classes")
+            xpackage.appendChild(xclasses)
+            for _, class_elt in sorted(iitems(class_elts)):
+                xclasses.appendChild(class_elt)
+            xpackage.setAttribute("name", pkg_name.replace(os.sep, '.'))
+            xpackage.setAttribute("line-rate", rate(lhits, lnum))
+            if has_arcs:
+                branch_rate = rate(bhits, bnum)
+            else:
+                branch_rate = "0"
+            xpackage.setAttribute("branch-rate", branch_rate)
+            xpackage.setAttribute("complexity", "0")
+
+            lnum_tot += lnum
+            lhits_tot += lhits
+            bnum_tot += bnum
+            bhits_tot += bhits
+
+        xcoverage.setAttribute("lines-valid", str(lnum_tot))
+        xcoverage.setAttribute("lines-covered", str(lhits_tot))
+        xcoverage.setAttribute("line-rate", rate(lhits_tot, lnum_tot))
+        if has_arcs:
+            xcoverage.setAttribute("branches-valid", str(bnum_tot))
+            xcoverage.setAttribute("branches-covered", str(bhits_tot))
+            xcoverage.setAttribute("branch-rate", rate(bhits_tot, bnum_tot))
+        else:
+            xcoverage.setAttribute("branches-covered", "0")
+            xcoverage.setAttribute("branches-valid", "0")
+            xcoverage.setAttribute("branch-rate", "0")
+        xcoverage.setAttribute("complexity", "0")
+
+        # Write the output file.
+        outfile.write(serialize_xml(self.xml_out))
+
+        # Return the total percentage.
+        denom = lnum_tot + bnum_tot
+        if denom == 0:
+            pct = 0.0
+        else:
+            pct = 100.0 * (lhits_tot + bhits_tot) / denom
+        return pct
+
+    def xml_file(self, fr, analysis, has_arcs):
+        """Add to the XML report for a single file."""
+
+        if self.config.skip_empty:
+            if analysis.numbers.n_statements == 0:
+                return
+
+        # Create the 'lines' and 'package' XML elements, which
+        # are populated later.  Note that a package == a directory.
+        filename = fr.filename.replace("\\", "/")
+        for source_path in self.source_paths:
+            source_path = files.canonical_filename(source_path)
+            if filename.startswith(source_path.replace("\\", "/") + "/"):
+                rel_name = filename[len(source_path)+1:]
+                break
+        else:
+            rel_name = fr.relative_filename()
+            self.source_paths.add(fr.filename[:-len(rel_name)].rstrip(r"\/"))
+
+        dirname = os.path.dirname(rel_name) or u"."
+        dirname = "/".join(dirname.split("/")[:self.config.xml_package_depth])
+        package_name = dirname.replace("/", ".")
+
+        package = self.packages.setdefault(package_name, [{}, 0, 0, 0, 0])
+
+        xclass = self.xml_out.createElement("class")
+
+        xclass.appendChild(self.xml_out.createElement("methods"))
+
+        xlines = self.xml_out.createElement("lines")
+        xclass.appendChild(xlines)
+
+        xclass.setAttribute("name", os.path.relpath(rel_name, dirname))
+        xclass.setAttribute("filename", rel_name.replace("\\", "/"))
+        xclass.setAttribute("complexity", "0")
+
+        branch_stats = analysis.branch_stats()
+        missing_branch_arcs = analysis.missing_branch_arcs()
+
+        # For each statement, create an XML 'line' element.
+        for line in sorted(analysis.statements):
+            xline = self.xml_out.createElement("line")
+            xline.setAttribute("number", str(line))
+
+            # Q: can we get info about the number of times a statement is
+            # executed?  If so, that should be recorded here.
+            xline.setAttribute("hits", str(int(line not in analysis.missing)))
+
+            if has_arcs:
+                if line in branch_stats:
+                    total, taken = branch_stats[line]
+                    xline.setAttribute("branch", "true")
+                    xline.setAttribute(
+                        "condition-coverage",
+                        "%d%% (%d/%d)" % (100*taken//total, taken, total)
+                        )
+                if line in missing_branch_arcs:
+                    annlines = ["exit" if b < 0 else str(b) for b in missing_branch_arcs[line]]
+                    xline.setAttribute("missing-branches", ",".join(annlines))
+            xlines.appendChild(xline)
+
+        class_lines = len(analysis.statements)
+        class_hits = class_lines - len(analysis.missing)
+
+        if has_arcs:
+            class_branches = sum(t for t, k in branch_stats.values())
+            missing_branches = sum(t - k for t, k in branch_stats.values())
+            class_br_hits = class_branches - missing_branches
+        else:
+            class_branches = 0.0
+            class_br_hits = 0.0
+
+        # Finalize the statistics that are collected in the XML DOM.
+        xclass.setAttribute("line-rate", rate(class_hits, class_lines))
+        if has_arcs:
+            branch_rate = rate(class_br_hits, class_branches)
+        else:
+            branch_rate = "0"
+        xclass.setAttribute("branch-rate", branch_rate)
+
+        package[0][rel_name] = xclass
+        package[1] += class_hits
+        package[2] += class_lines
+        package[3] += class_br_hits
+        package[4] += class_branches
+
+
+def serialize_xml(dom):
+    """Serialize a minidom node to XML."""
+    out = dom.toprettyxml()
+    if env.PY2:
+        out = out.encode("utf8")
+    return out
diff --git a/contrib/python/coverage/py3/ya.make b/contrib/python/coverage/py3/ya.make
new file mode 100644
index 0000000000..76625b48eb
--- /dev/null
+++ b/contrib/python/coverage/py3/ya.make
@@ -0,0 +1,98 @@
+# Generated by devtools/yamaker (pypi).
+
+PY3_LIBRARY()
+
+VERSION(5.5)
+
+LICENSE(Apache-2.0)
+
+PEERDIR(
+    contrib/python/coverage/plugins
+    library/python/resource
+)
+
+NO_COMPILER_WARNINGS()
+
+NO_LINT()
+
+NO_CHECK_IMPORTS(
+    coverage.fullcoverage.encodings
+)
+
+SRCS(
+    coverage/ctracer/datastack.c
+    coverage/ctracer/filedisp.c
+    coverage/ctracer/module.c
+    coverage/ctracer/tracer.c
+)
+
+PY_REGISTER(
+    coverage.tracer
+)
+
+PY_SRCS(
+    TOP_LEVEL
+    coverage/__init__.py
+    coverage/__main__.py
+    coverage/annotate.py
+    coverage/backward.py
+    coverage/bytecode.py
+    coverage/cmdline.py
+    coverage/collector.py
+    coverage/config.py
+    coverage/context.py
+    coverage/control.py
+    coverage/data.py
+    coverage/debug.py
+    coverage/disposition.py
+    coverage/env.py
+    coverage/execfile.py
+    coverage/files.py
+    coverage/fullcoverage/encodings.py
+    coverage/html.py
+    coverage/inorout.py
+    coverage/jsonreport.py
+    coverage/misc.py
+    coverage/multiproc.py
+    coverage/numbits.py
+    coverage/parser.py
+    coverage/phystokens.py
+    coverage/plugin.py
+    coverage/plugin_support.py
+    coverage/python.py
+    coverage/pytracer.py
+    coverage/report.py
+    coverage/results.py
+    coverage/sqldata.py
+    coverage/summary.py
+    coverage/templite.py
+    coverage/tomlconfig.py
+    coverage/version.py
+    coverage/xmlreport.py
+)
+
+RESOURCE_FILES(
+    PREFIX contrib/python/coverage/py3/
+    .dist-info/METADATA
+    .dist-info/entry_points.txt
+    .dist-info/top_level.txt
+    coverage/htmlfiles/coverage_html.js
+    coverage/htmlfiles/favicon_32.png
+    coverage/htmlfiles/index.html
+    coverage/htmlfiles/jquery.ba-throttle-debounce.min.js
+    coverage/htmlfiles/jquery.hotkeys.js
+    coverage/htmlfiles/jquery.isonscreen.js
+    coverage/htmlfiles/jquery.min.js
+    coverage/htmlfiles/jquery.tablesorter.min.js
+    coverage/htmlfiles/keybd_closed.png
+    coverage/htmlfiles/keybd_open.png
+    coverage/htmlfiles/pyfile.html
+    coverage/htmlfiles/style.css
+    coverage/htmlfiles/style.scss
+)
+
+END()
+
+RECURSE(
+    bin
+)