fix ya.make

28 files changed, 0 insertions, 5888 deletions

diff --git a/contrib/python/attrs/.dist-info/METADATA b/contrib/python/attrs/.dist-info/METADATA
deleted file mode 100644
index ceca5b9adfe..00000000000
--- a/contrib/python/attrs/.dist-info/METADATA
+++ /dev/null
@@ -1,211 +0,0 @@
-Metadata-Version: 2.1
-Name: attrs
-Version: 21.2.0
-Summary: Classes Without Boilerplate
-Home-page: https://www.attrs.org/
-Author: Hynek Schlawack
-Author-email: hs@ox.cx
-Maintainer: Hynek Schlawack
-Maintainer-email: hs@ox.cx
-License: MIT
-Project-URL: Documentation, https://www.attrs.org/
-Project-URL: Changelog, https://www.attrs.org/en/stable/changelog.html
-Project-URL: Bug Tracker, https://github.com/python-attrs/attrs/issues
-Project-URL: Source Code, https://github.com/python-attrs/attrs
-Project-URL: Funding, https://github.com/sponsors/hynek
-Project-URL: Tidelift, https://tidelift.com/subscription/pkg/pypi-attrs?utm_source=pypi-attrs&utm_medium=pypi
-Project-URL: Ko-fi, https://ko-fi.com/the_hynek
-Keywords: class,attribute,boilerplate
-Platform: UNKNOWN
-Classifier: Development Status :: 5 - Production/Stable
-Classifier: Intended Audience :: Developers
-Classifier: Natural Language :: English
-Classifier: License :: OSI Approved :: MIT 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 :: Libraries :: Python Modules
-Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*
-Description-Content-Type: text/x-rst
-Provides-Extra: dev
-Requires-Dist: coverage[toml] (>=5.0.2) ; extra == 'dev'
-Requires-Dist: hypothesis ; extra == 'dev'
-Requires-Dist: pympler ; extra == 'dev'
-Requires-Dist: pytest (>=4.3.0) ; extra == 'dev'
-Requires-Dist: six ; extra == 'dev'
-Requires-Dist: mypy ; extra == 'dev'
-Requires-Dist: pytest-mypy-plugins ; extra == 'dev'
-Requires-Dist: zope.interface ; extra == 'dev'
-Requires-Dist: furo ; extra == 'dev'
-Requires-Dist: sphinx ; extra == 'dev'
-Requires-Dist: sphinx-notfound-page ; extra == 'dev'
-Requires-Dist: pre-commit ; extra == 'dev'
-Provides-Extra: docs
-Requires-Dist: furo ; extra == 'docs'
-Requires-Dist: sphinx ; extra == 'docs'
-Requires-Dist: zope.interface ; extra == 'docs'
-Requires-Dist: sphinx-notfound-page ; extra == 'docs'
-Provides-Extra: tests
-Requires-Dist: coverage[toml] (>=5.0.2) ; extra == 'tests'
-Requires-Dist: hypothesis ; extra == 'tests'
-Requires-Dist: pympler ; extra == 'tests'
-Requires-Dist: pytest (>=4.3.0) ; extra == 'tests'
-Requires-Dist: six ; extra == 'tests'
-Requires-Dist: mypy ; extra == 'tests'
-Requires-Dist: pytest-mypy-plugins ; extra == 'tests'
-Requires-Dist: zope.interface ; extra == 'tests'
-Provides-Extra: tests_no_zope
-Requires-Dist: coverage[toml] (>=5.0.2) ; extra == 'tests_no_zope'
-Requires-Dist: hypothesis ; extra == 'tests_no_zope'
-Requires-Dist: pympler ; extra == 'tests_no_zope'
-Requires-Dist: pytest (>=4.3.0) ; extra == 'tests_no_zope'
-Requires-Dist: six ; extra == 'tests_no_zope'
-Requires-Dist: mypy ; extra == 'tests_no_zope'
-Requires-Dist: pytest-mypy-plugins ; extra == 'tests_no_zope'
-
-======================================
-``attrs``: Classes Without Boilerplate
-======================================
-
-
-``attrs`` is the Python package that will bring back the **joy** of **writing classes** by relieving you from the drudgery of implementing object protocols (aka `dunder <https://nedbatchelder.com/blog/200605/dunder.html>`_ methods).
-`Trusted by NASA <https://docs.github.com/en/github/setting-up-and-managing-your-github-profile/personalizing-your-profile#list-of-qualifying-repositories-for-mars-2020-helicopter-contributor-badge>`_ for Mars missions since 2020!
-
-Its main goal is to help you to write **concise** and **correct** software without slowing down your code.
-
-.. teaser-end
-
-For that, it gives you a class decorator and a way to declaratively define the attributes on that class:
-
-.. -code-begin-
-
-.. code-block:: pycon
-
-   >>> import attr
-
-   >>> @attr.s
-   ... class SomeClass(object):
-   ...     a_number = attr.ib(default=42)
-   ...     list_of_numbers = attr.ib(factory=list)
-   ...
-   ...     def hard_math(self, another_number):
-   ...         return self.a_number + sum(self.list_of_numbers) * another_number
-
-
-   >>> sc = SomeClass(1, [1, 2, 3])
-   >>> sc
-   SomeClass(a_number=1, list_of_numbers=[1, 2, 3])
-
-   >>> sc.hard_math(3)
-   19
-   >>> sc == SomeClass(1, [1, 2, 3])
-   True
-   >>> sc != SomeClass(2, [3, 2, 1])
-   True
-
-   >>> attr.asdict(sc)
-   {'a_number': 1, 'list_of_numbers': [1, 2, 3]}
-
-   >>> SomeClass()
-   SomeClass(a_number=42, list_of_numbers=[])
-
-   >>> C = attr.make_class("C", ["a", "b"])
-   >>> C("foo", "bar")
-   C(a='foo', b='bar')
-
-
-After *declaring* your attributes ``attrs`` gives you:
-
-- a concise and explicit overview of the class's attributes,
-- a nice human-readable ``__repr__``,
-- a complete set of comparison methods (equality and ordering),
-- an initializer,
-- and much more,
-
-*without* writing dull boilerplate code again and again and *without* runtime performance penalties.
-
-On Python 3.6 and later, you can often even drop the calls to ``attr.ib()`` by using `type annotations <https://www.attrs.org/en/latest/types.html>`_.
-
-This gives you the power to use actual classes with actual types in your code instead of confusing ``tuple``\ s or `confusingly behaving <https://www.attrs.org/en/stable/why.html#namedtuples>`_ ``namedtuple``\ s.
-Which in turn encourages you to write *small classes* that do `one thing well <https://www.destroyallsoftware.com/talks/boundaries>`_.
-Never again violate the `single responsibility principle <https://en.wikipedia.org/wiki/Single_responsibility_principle>`_ just because implementing ``__init__`` et al is a painful drag.
-
-
-.. -getting-help-
-
-Getting Help
-============
-
-Please use the ``python-attrs`` tag on `StackOverflow <https://stackoverflow.com/questions/tagged/python-attrs>`_ to get help.
-
-Answering questions of your fellow developers is also a great way to help the project!
-
-
-.. -project-information-
-
-Project Information
-===================
-
-``attrs`` is released under the `MIT <https://choosealicense.com/licenses/mit/>`_ license,
-its documentation lives at `Read the Docs <https://www.attrs.org/>`_,
-the code on `GitHub <https://github.com/python-attrs/attrs>`_,
-and the latest release on `PyPI <https://pypi.org/project/attrs/>`_.
-It’s rigorously tested on Python 2.7, 3.5+, and PyPy.
-
-We collect information on **third-party extensions** in our `wiki <https://github.com/python-attrs/attrs/wiki/Extensions-to-attrs>`_.
-Feel free to browse and add your own!
-
-If you'd like to contribute to ``attrs`` you're most welcome and we've written `a little guide <https://www.attrs.org/en/latest/contributing.html>`_ to get you started!
-
-
-``attrs`` for Enterprise
-------------------------
-
-Available as part of the Tidelift Subscription.
-
-The maintainers of ``attrs`` and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source packages you use to build your applications.
-Save time, reduce risk, and improve code health, while paying the maintainers of the exact packages you use.
-`Learn more. <https://tidelift.com/subscription/pkg/pypi-attrs?utm_source=pypi-attrs&utm_medium=referral&utm_campaign=enterprise&utm_term=repo>`_
-
-
-Release Information
-===================
-
-21.2.0 (2021-05-07)
--------------------
-
-Backward-incompatible Changes
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-- We had to revert the recursive feature for ``attr.evolve()`` because it broke some use-cases -- sorry!
-  `#806 <https://github.com/python-attrs/attrs/issues/806>`_
-- Python 3.4 is now blocked using packaging metadata because ``attrs`` can't be imported on it anymore.
-  To ensure that 3.4 users can keep installing  ``attrs`` easily, we will `yank <https://pypi.org/help/#yanked>`_ 21.1.0 from PyPI.
-  This has **no** consequences if you pin ``attrs`` to 21.1.0.
-  `#807 <https://github.com/python-attrs/attrs/issues/807>`_
-
-`Full changelog <https://www.attrs.org/en/stable/changelog.html>`_.
-
-Credits
-=======
-
-``attrs`` is written and maintained by `Hynek Schlawack <https://hynek.me/>`_.
-
-The development is kindly supported by `Variomedia AG <https://www.variomedia.de/>`_.
-
-A full list of contributors can be found in `GitHub's overview <https://github.com/python-attrs/attrs/graphs/contributors>`_.
-
-It’s the spiritual successor of `characteristic <https://characteristic.readthedocs.io/>`_ and aspires to fix some of it clunkiness and unfortunate decisions.
-Both were inspired by Twisted’s `FancyEqMixin <https://twistedmatrix.com/documents/current/api/twisted.python.util.FancyEqMixin.html>`_ but both are implemented using class decorators because `subclassing is bad for you <https://www.youtube.com/watch?v=3MNVP9-hglc>`_, m’kay?
-
-
diff --git a/contrib/python/attrs/.dist-info/top_level.txt b/contrib/python/attrs/.dist-info/top_level.txt
deleted file mode 100644
index 66a062d889d..00000000000
--- a/contrib/python/attrs/.dist-info/top_level.txt
+++ /dev/null
@@ -1 +0,0 @@
-attr
diff --git a/contrib/python/attrs/.yandex_meta/yamaker.yaml b/contrib/python/attrs/.yandex_meta/yamaker.yaml
deleted file mode 100644
index c14879ed876..00000000000
--- a/contrib/python/attrs/.yandex_meta/yamaker.yaml
+++ /dev/null
@@ -1,2 +0,0 @@
-mark_as_py3_sources:
-- attr/_next_gen.py
diff --git a/contrib/python/attrs/AUTHORS.rst b/contrib/python/attrs/AUTHORS.rst
deleted file mode 100644
index f14ef6c6074..00000000000
--- a/contrib/python/attrs/AUTHORS.rst
+++ /dev/null
@@ -1,11 +0,0 @@
-Credits
-=======
-
-``attrs`` is written and maintained by `Hynek Schlawack <https://hynek.me/>`_.
-
-The development is kindly supported by `Variomedia AG <https://www.variomedia.de/>`_.
-
-A full list of contributors can be found in `GitHub's overview <https://github.com/python-attrs/attrs/graphs/contributors>`_.
-
-It’s the spiritual successor of `characteristic <https://characteristic.readthedocs.io/>`_ and aspires to fix some of it clunkiness and unfortunate decisions.
-Both were inspired by Twisted’s `FancyEqMixin <https://twistedmatrix.com/documents/current/api/twisted.python.util.FancyEqMixin.html>`_ but both are implemented using class decorators because `subclassing is bad for you <https://www.youtube.com/watch?v=3MNVP9-hglc>`_, m’kay?
diff --git a/contrib/python/attrs/LICENSE b/contrib/python/attrs/LICENSE
deleted file mode 100644
index 7ae3df93097..00000000000
--- a/contrib/python/attrs/LICENSE
+++ /dev/null
@@ -1,21 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) 2015 Hynek Schlawack
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
diff --git a/contrib/python/attrs/README.rst b/contrib/python/attrs/README.rst
deleted file mode 100644
index d080f1de81a..00000000000
--- a/contrib/python/attrs/README.rst
+++ /dev/null
@@ -1,122 +0,0 @@
-.. raw:: html
-
-   <p align="center">
-      <a href="https://www.attrs.org/">
-         <img src="./docs/_static/attrs_logo.svg" width="35%" alt="attrs" />
-      </a>
-   </p>
-   <p align="center">
-      <a href="https://www.attrs.org/en/stable/?badge=stable">
-          <img src="https://readthedocs.org/projects/attrs/badge/?version=stable" alt="Documentation Status" />
-      </a>
-      <a href="https://github.com/python-attrs/attrs/actions?workflow=CI">
-          <img src="https://github.com/python-attrs/attrs/workflows/CI/badge.svg?branch=main" alt="CI Status" />
-      </a>
-      <a href="https://codecov.io/github/python-attrs/attrs">
-          <img src="https://codecov.io/github/python-attrs/attrs/branch/main/graph/badge.svg" alt="Test Coverage" />
-      </a>
-      <a href="https://github.com/psf/black">
-          <img src="https://img.shields.io/badge/code%20style-black-000000.svg" alt="Code style: black" />
-      </a>
-   </p>
-
-.. teaser-begin
-
-``attrs`` is the Python package that will bring back the **joy** of **writing classes** by relieving you from the drudgery of implementing object protocols (aka `dunder <https://nedbatchelder.com/blog/200605/dunder.html>`_ methods).
-`Trusted by NASA <https://docs.github.com/en/github/setting-up-and-managing-your-github-profile/personalizing-your-profile#list-of-qualifying-repositories-for-mars-2020-helicopter-contributor-badge>`_ for Mars missions since 2020!
-
-Its main goal is to help you to write **concise** and **correct** software without slowing down your code.
-
-.. teaser-end
-
-For that, it gives you a class decorator and a way to declaratively define the attributes on that class:
-
-.. -code-begin-
-
-.. code-block:: pycon
-
-   >>> import attr
-
-   >>> @attr.s
-   ... class SomeClass(object):
-   ...     a_number = attr.ib(default=42)
-   ...     list_of_numbers = attr.ib(factory=list)
-   ...
-   ...     def hard_math(self, another_number):
-   ...         return self.a_number + sum(self.list_of_numbers) * another_number
-
-
-   >>> sc = SomeClass(1, [1, 2, 3])
-   >>> sc
-   SomeClass(a_number=1, list_of_numbers=[1, 2, 3])
-
-   >>> sc.hard_math(3)
-   19
-   >>> sc == SomeClass(1, [1, 2, 3])
-   True
-   >>> sc != SomeClass(2, [3, 2, 1])
-   True
-
-   >>> attr.asdict(sc)
-   {'a_number': 1, 'list_of_numbers': [1, 2, 3]}
-
-   >>> SomeClass()
-   SomeClass(a_number=42, list_of_numbers=[])
-
-   >>> C = attr.make_class("C", ["a", "b"])
-   >>> C("foo", "bar")
-   C(a='foo', b='bar')
-
-
-After *declaring* your attributes ``attrs`` gives you:
-
-- a concise and explicit overview of the class's attributes,
-- a nice human-readable ``__repr__``,
-- a complete set of comparison methods (equality and ordering),
-- an initializer,
-- and much more,
-
-*without* writing dull boilerplate code again and again and *without* runtime performance penalties.
-
-On Python 3.6 and later, you can often even drop the calls to ``attr.ib()`` by using `type annotations <https://www.attrs.org/en/latest/types.html>`_.
-
-This gives you the power to use actual classes with actual types in your code instead of confusing ``tuple``\ s or `confusingly behaving <https://www.attrs.org/en/stable/why.html#namedtuples>`_ ``namedtuple``\ s.
-Which in turn encourages you to write *small classes* that do `one thing well <https://www.destroyallsoftware.com/talks/boundaries>`_.
-Never again violate the `single responsibility principle <https://en.wikipedia.org/wiki/Single_responsibility_principle>`_ just because implementing ``__init__`` et al is a painful drag.
-
-
-.. -getting-help-
-
-Getting Help
-============
-
-Please use the ``python-attrs`` tag on `StackOverflow <https://stackoverflow.com/questions/tagged/python-attrs>`_ to get help.
-
-Answering questions of your fellow developers is also a great way to help the project!
-
-
-.. -project-information-
-
-Project Information
-===================
-
-``attrs`` is released under the `MIT <https://choosealicense.com/licenses/mit/>`_ license,
-its documentation lives at `Read the Docs <https://www.attrs.org/>`_,
-the code on `GitHub <https://github.com/python-attrs/attrs>`_,
-and the latest release on `PyPI <https://pypi.org/project/attrs/>`_.
-It’s rigorously tested on Python 2.7, 3.5+, and PyPy.
-
-We collect information on **third-party extensions** in our `wiki <https://github.com/python-attrs/attrs/wiki/Extensions-to-attrs>`_.
-Feel free to browse and add your own!
-
-If you'd like to contribute to ``attrs`` you're most welcome and we've written `a little guide <https://www.attrs.org/en/latest/contributing.html>`_ to get you started!
-
-
-``attrs`` for Enterprise
-------------------------
-
-Available as part of the Tidelift Subscription.
-
-The maintainers of ``attrs`` and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source packages you use to build your applications.
-Save time, reduce risk, and improve code health, while paying the maintainers of the exact packages you use.
-`Learn more. <https://tidelift.com/subscription/pkg/pypi-attrs?utm_source=pypi-attrs&utm_medium=referral&utm_campaign=enterprise&utm_term=repo>`_
diff --git a/contrib/python/attrs/attr/__init__.py b/contrib/python/attrs/attr/__init__.py
deleted file mode 100644
index b1ce7fe248b..00000000000
--- a/contrib/python/attrs/attr/__init__.py
+++ /dev/null
@@ -1,78 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-import sys
-
-from functools import partial
-
-from . import converters, exceptions, filters, setters, validators
-from ._cmp import cmp_using
-from ._config import get_run_validators, set_run_validators
-from ._funcs import asdict, assoc, astuple, evolve, has, resolve_types
-from ._make import (
-    NOTHING,
-    Attribute,
-    Factory,
-    attrib,
-    attrs,
-    fields,
-    fields_dict,
-    make_class,
-    validate,
-)
-from ._version_info import VersionInfo
-
-
-__version__ = "21.2.0"
-__version_info__ = VersionInfo._from_version_string(__version__)
-
-__title__ = "attrs"
-__description__ = "Classes Without Boilerplate"
-__url__ = "https://www.attrs.org/"
-__uri__ = __url__
-__doc__ = __description__ + " <" + __uri__ + ">"
-
-__author__ = "Hynek Schlawack"
-__email__ = "hs@ox.cx"
-
-__license__ = "MIT"
-__copyright__ = "Copyright (c) 2015 Hynek Schlawack"
-
-
-s = attributes = attrs
-ib = attr = attrib
-dataclass = partial(attrs, auto_attribs=True)  # happy Easter ;)
-
-__all__ = [
-    "Attribute",
-    "Factory",
-    "NOTHING",
-    "asdict",
-    "assoc",
-    "astuple",
-    "attr",
-    "attrib",
-    "attributes",
-    "attrs",
-    "cmp_using",
-    "converters",
-    "evolve",
-    "exceptions",
-    "fields",
-    "fields_dict",
-    "filters",
-    "get_run_validators",
-    "has",
-    "ib",
-    "make_class",
-    "resolve_types",
-    "s",
-    "set_run_validators",
-    "setters",
-    "validate",
-    "validators",
-]
-
-if sys.version_info[:2] >= (3, 6):
-    from ._next_gen import define, field, frozen, mutable
-
-    __all__.extend((define, field, frozen, mutable))
diff --git a/contrib/python/attrs/attr/__init__.pyi b/contrib/python/attrs/attr/__init__.pyi
deleted file mode 100644
index 3503b073b4d..00000000000
--- a/contrib/python/attrs/attr/__init__.pyi
+++ /dev/null
@@ -1,475 +0,0 @@
-import sys
-
-from typing import (
-    Any,
-    Callable,
-    Dict,
-    Generic,
-    List,
-    Mapping,
-    Optional,
-    Sequence,
-    Tuple,
-    Type,
-    TypeVar,
-    Union,
-    overload,
-)
-
-# `import X as X` is required to make these public
-from . import converters as converters
-from . import exceptions as exceptions
-from . import filters as filters
-from . import setters as setters
-from . import validators as validators
-from ._version_info import VersionInfo
-
-
-__version__: str
-__version_info__: VersionInfo
-__title__: str
-__description__: str
-__url__: str
-__uri__: str
-__author__: str
-__email__: str
-__license__: str
-__copyright__: str
-
-_T = TypeVar("_T")
-_C = TypeVar("_C", bound=type)
-
-_EqOrderType = Union[bool, Callable[[Any], Any]]
-_ValidatorType = Callable[[Any, Attribute[_T], _T], Any]
-_ConverterType = Callable[[Any], Any]
-_FilterType = Callable[[Attribute[_T], _T], bool]
-_ReprType = Callable[[Any], str]
-_ReprArgType = Union[bool, _ReprType]
-_OnSetAttrType = Callable[[Any, Attribute[Any], Any], Any]
-_OnSetAttrArgType = Union[
-    _OnSetAttrType, List[_OnSetAttrType], setters._NoOpType
-]
-_FieldTransformer = Callable[[type, List[Attribute[Any]]], List[Attribute[Any]]]
-# FIXME: in reality, if multiple validators are passed they must be in a list
-# or tuple, but those are invariant and so would prevent subtypes of
-# _ValidatorType from working when passed in a list or tuple.
-_ValidatorArgType = Union[_ValidatorType[_T], Sequence[_ValidatorType[_T]]]
-
-# _make --
-
-NOTHING: object
-
-# NOTE: Factory lies about its return type to make this possible:
-# `x: List[int] # = Factory(list)`
-# Work around mypy issue #4554 in the common case by using an overload.
-if sys.version_info >= (3, 8):
-    from typing import Literal
-
-    @overload
-    def Factory(factory: Callable[[], _T]) -> _T: ...
-    @overload
-    def Factory(
-        factory: Callable[[Any], _T],
-        takes_self: Literal[True],
-    ) -> _T: ...
-    @overload
-    def Factory(
-        factory: Callable[[], _T],
-        takes_self: Literal[False],
-    ) -> _T: ...
-else:
-    @overload
-    def Factory(factory: Callable[[], _T]) -> _T: ...
-    @overload
-    def Factory(
-        factory: Union[Callable[[Any], _T], Callable[[], _T]],
-        takes_self: bool = ...,
-    ) -> _T: ...
-
-# Static type inference support via __dataclass_transform__ implemented as per:
-# https://github.com/microsoft/pyright/blob/1.1.135/specs/dataclass_transforms.md
-# This annotation must be applied to all overloads of "define" and "attrs"
-#
-# NOTE: This is a typing construct and does not exist at runtime.  Extensions
-# wrapping attrs decorators should declare a separate __dataclass_transform__
-# signature in the extension module using the specification linked above to
-# provide pyright support.
-def __dataclass_transform__(
-    *,
-    eq_default: bool = True,
-    order_default: bool = False,
-    kw_only_default: bool = False,
-    field_descriptors: Tuple[Union[type, Callable[..., Any]], ...] = (()),
-) -> Callable[[_T], _T]: ...
-
-class Attribute(Generic[_T]):
-    name: str
-    default: Optional[_T]
-    validator: Optional[_ValidatorType[_T]]
-    repr: _ReprArgType
-    cmp: _EqOrderType
-    eq: _EqOrderType
-    order: _EqOrderType
-    hash: Optional[bool]
-    init: bool
-    converter: Optional[_ConverterType]
-    metadata: Dict[Any, Any]
-    type: Optional[Type[_T]]
-    kw_only: bool
-    on_setattr: _OnSetAttrType
-
-    def evolve(self, **changes: Any) -> "Attribute[Any]": ...
-
-# NOTE: We had several choices for the annotation to use for type arg:
-# 1) Type[_T]
-#   - Pros: Handles simple cases correctly
-#   - Cons: Might produce less informative errors in the case of conflicting
-#     TypeVars e.g. `attr.ib(default='bad', type=int)`
-# 2) Callable[..., _T]
-#   - Pros: Better error messages than #1 for conflicting TypeVars
-#   - Cons: Terrible error messages for validator checks.
-#   e.g. attr.ib(type=int, validator=validate_str)
-#        -> error: Cannot infer function type argument
-# 3) type (and do all of the work in the mypy plugin)
-#   - Pros: Simple here, and we could customize the plugin with our own errors.
-#   - Cons: Would need to write mypy plugin code to handle all the cases.
-# We chose option #1.
-
-# `attr` lies about its return type to make the following possible:
-#     attr()    -> Any
-#     attr(8)   -> int
-#     attr(validator=<some callable>)  -> Whatever the callable expects.
-# This makes this type of assignments possible:
-#     x: int = attr(8)
-#
-# This form catches explicit None or no default but with no other arguments
-# returns Any.
-@overload
-def attrib(
-    default: None = ...,
-    validator: None = ...,
-    repr: _ReprArgType = ...,
-    cmp: Optional[_EqOrderType] = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    metadata: Optional[Mapping[Any, Any]] = ...,
-    type: None = ...,
-    converter: None = ...,
-    factory: None = ...,
-    kw_only: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-) -> Any: ...
-
-# This form catches an explicit None or no default and infers the type from the
-# other arguments.
-@overload
-def attrib(
-    default: None = ...,
-    validator: Optional[_ValidatorArgType[_T]] = ...,
-    repr: _ReprArgType = ...,
-    cmp: Optional[_EqOrderType] = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    metadata: Optional[Mapping[Any, Any]] = ...,
-    type: Optional[Type[_T]] = ...,
-    converter: Optional[_ConverterType] = ...,
-    factory: Optional[Callable[[], _T]] = ...,
-    kw_only: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-) -> _T: ...
-
-# This form catches an explicit default argument.
-@overload
-def attrib(
-    default: _T,
-    validator: Optional[_ValidatorArgType[_T]] = ...,
-    repr: _ReprArgType = ...,
-    cmp: Optional[_EqOrderType] = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    metadata: Optional[Mapping[Any, Any]] = ...,
-    type: Optional[Type[_T]] = ...,
-    converter: Optional[_ConverterType] = ...,
-    factory: Optional[Callable[[], _T]] = ...,
-    kw_only: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-) -> _T: ...
-
-# This form covers type=non-Type: e.g. forward references (str), Any
-@overload
-def attrib(
-    default: Optional[_T] = ...,
-    validator: Optional[_ValidatorArgType[_T]] = ...,
-    repr: _ReprArgType = ...,
-    cmp: Optional[_EqOrderType] = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    metadata: Optional[Mapping[Any, Any]] = ...,
-    type: object = ...,
-    converter: Optional[_ConverterType] = ...,
-    factory: Optional[Callable[[], _T]] = ...,
-    kw_only: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-) -> Any: ...
-@overload
-def field(
-    *,
-    default: None = ...,
-    validator: None = ...,
-    repr: _ReprArgType = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    metadata: Optional[Mapping[Any, Any]] = ...,
-    converter: None = ...,
-    factory: None = ...,
-    kw_only: bool = ...,
-    eq: Optional[bool] = ...,
-    order: Optional[bool] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-) -> Any: ...
-
-# This form catches an explicit None or no default and infers the type from the
-# other arguments.
-@overload
-def field(
-    *,
-    default: None = ...,
-    validator: Optional[_ValidatorArgType[_T]] = ...,
-    repr: _ReprArgType = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    metadata: Optional[Mapping[Any, Any]] = ...,
-    converter: Optional[_ConverterType] = ...,
-    factory: Optional[Callable[[], _T]] = ...,
-    kw_only: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-) -> _T: ...
-
-# This form catches an explicit default argument.
-@overload
-def field(
-    *,
-    default: _T,
-    validator: Optional[_ValidatorArgType[_T]] = ...,
-    repr: _ReprArgType = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    metadata: Optional[Mapping[Any, Any]] = ...,
-    converter: Optional[_ConverterType] = ...,
-    factory: Optional[Callable[[], _T]] = ...,
-    kw_only: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-) -> _T: ...
-
-# This form covers type=non-Type: e.g. forward references (str), Any
-@overload
-def field(
-    *,
-    default: Optional[_T] = ...,
-    validator: Optional[_ValidatorArgType[_T]] = ...,
-    repr: _ReprArgType = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    metadata: Optional[Mapping[Any, Any]] = ...,
-    converter: Optional[_ConverterType] = ...,
-    factory: Optional[Callable[[], _T]] = ...,
-    kw_only: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-) -> Any: ...
-@overload
-@__dataclass_transform__(order_default=True, field_descriptors=(attrib, field))
-def attrs(
-    maybe_cls: _C,
-    these: Optional[Dict[str, Any]] = ...,
-    repr_ns: Optional[str] = ...,
-    repr: bool = ...,
-    cmp: Optional[_EqOrderType] = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    slots: bool = ...,
-    frozen: bool = ...,
-    weakref_slot: bool = ...,
-    str: bool = ...,
-    auto_attribs: bool = ...,
-    kw_only: bool = ...,
-    cache_hash: bool = ...,
-    auto_exc: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    auto_detect: bool = ...,
-    collect_by_mro: bool = ...,
-    getstate_setstate: Optional[bool] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-    field_transformer: Optional[_FieldTransformer] = ...,
-) -> _C: ...
-@overload
-@__dataclass_transform__(order_default=True, field_descriptors=(attrib, field))
-def attrs(
-    maybe_cls: None = ...,
-    these: Optional[Dict[str, Any]] = ...,
-    repr_ns: Optional[str] = ...,
-    repr: bool = ...,
-    cmp: Optional[_EqOrderType] = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    slots: bool = ...,
-    frozen: bool = ...,
-    weakref_slot: bool = ...,
-    str: bool = ...,
-    auto_attribs: bool = ...,
-    kw_only: bool = ...,
-    cache_hash: bool = ...,
-    auto_exc: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    auto_detect: bool = ...,
-    collect_by_mro: bool = ...,
-    getstate_setstate: Optional[bool] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-    field_transformer: Optional[_FieldTransformer] = ...,
-) -> Callable[[_C], _C]: ...
-@overload
-@__dataclass_transform__(field_descriptors=(attrib, field))
-def define(
-    maybe_cls: _C,
-    *,
-    these: Optional[Dict[str, Any]] = ...,
-    repr: bool = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    slots: bool = ...,
-    frozen: bool = ...,
-    weakref_slot: bool = ...,
-    str: bool = ...,
-    auto_attribs: bool = ...,
-    kw_only: bool = ...,
-    cache_hash: bool = ...,
-    auto_exc: bool = ...,
-    eq: Optional[bool] = ...,
-    order: Optional[bool] = ...,
-    auto_detect: bool = ...,
-    getstate_setstate: Optional[bool] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-    field_transformer: Optional[_FieldTransformer] = ...,
-) -> _C: ...
-@overload
-@__dataclass_transform__(field_descriptors=(attrib, field))
-def define(
-    maybe_cls: None = ...,
-    *,
-    these: Optional[Dict[str, Any]] = ...,
-    repr: bool = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    slots: bool = ...,
-    frozen: bool = ...,
-    weakref_slot: bool = ...,
-    str: bool = ...,
-    auto_attribs: bool = ...,
-    kw_only: bool = ...,
-    cache_hash: bool = ...,
-    auto_exc: bool = ...,
-    eq: Optional[bool] = ...,
-    order: Optional[bool] = ...,
-    auto_detect: bool = ...,
-    getstate_setstate: Optional[bool] = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-    field_transformer: Optional[_FieldTransformer] = ...,
-) -> Callable[[_C], _C]: ...
-
-mutable = define
-frozen = define  # they differ only in their defaults
-
-# TODO: add support for returning NamedTuple from the mypy plugin
-class _Fields(Tuple[Attribute[Any], ...]):
-    def __getattr__(self, name: str) -> Attribute[Any]: ...
-
-def fields(cls: type) -> _Fields: ...
-def fields_dict(cls: type) -> Dict[str, Attribute[Any]]: ...
-def validate(inst: Any) -> None: ...
-def resolve_types(
-    cls: _C,
-    globalns: Optional[Dict[str, Any]] = ...,
-    localns: Optional[Dict[str, Any]] = ...,
-    attribs: Optional[List[Attribute[Any]]] = ...,
-) -> _C: ...
-
-# TODO: add support for returning a proper attrs class from the mypy plugin
-# we use Any instead of _CountingAttr so that e.g. `make_class('Foo',
-# [attr.ib()])` is valid
-def make_class(
-    name: str,
-    attrs: Union[List[str], Tuple[str, ...], Dict[str, Any]],
-    bases: Tuple[type, ...] = ...,
-    repr_ns: Optional[str] = ...,
-    repr: bool = ...,
-    cmp: Optional[_EqOrderType] = ...,
-    hash: Optional[bool] = ...,
-    init: bool = ...,
-    slots: bool = ...,
-    frozen: bool = ...,
-    weakref_slot: bool = ...,
-    str: bool = ...,
-    auto_attribs: bool = ...,
-    kw_only: bool = ...,
-    cache_hash: bool = ...,
-    auto_exc: bool = ...,
-    eq: Optional[_EqOrderType] = ...,
-    order: Optional[_EqOrderType] = ...,
-    collect_by_mro: bool = ...,
-    on_setattr: Optional[_OnSetAttrArgType] = ...,
-    field_transformer: Optional[_FieldTransformer] = ...,
-) -> type: ...
-
-# _funcs --
-
-# TODO: add support for returning TypedDict from the mypy plugin
-# FIXME: asdict/astuple do not honor their factory args. Waiting on one of
-# these:
-# https://github.com/python/mypy/issues/4236
-# https://github.com/python/typing/issues/253
-def asdict(
-    inst: Any,
-    recurse: bool = ...,
-    filter: Optional[_FilterType[Any]] = ...,
-    dict_factory: Type[Mapping[Any, Any]] = ...,
-    retain_collection_types: bool = ...,
-    value_serializer: Optional[Callable[[type, Attribute[Any], Any], Any]] = ...,
-) -> Dict[str, Any]: ...
-
-# TODO: add support for returning NamedTuple from the mypy plugin
-def astuple(
-    inst: Any,
-    recurse: bool = ...,
-    filter: Optional[_FilterType[Any]] = ...,
-    tuple_factory: Type[Sequence[Any]] = ...,
-    retain_collection_types: bool = ...,
-) -> Tuple[Any, ...]: ...
-def has(cls: type) -> bool: ...
-def assoc(inst: _T, **changes: Any) -> _T: ...
-def evolve(inst: _T, **changes: Any) -> _T: ...
-
-# _config --
-
-def set_run_validators(run: bool) -> None: ...
-def get_run_validators() -> bool: ...
-
-# aliases --
-
-s = attributes = attrs
-ib = attr = attrib
-dataclass = attrs  # Technically, partial(attrs, auto_attribs=True) ;)
diff --git a/contrib/python/attrs/attr/_cmp.py b/contrib/python/attrs/attr/_cmp.py
deleted file mode 100644
index b747b603f17..00000000000
--- a/contrib/python/attrs/attr/_cmp.py
+++ /dev/null
@@ -1,152 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-import functools
-
-from ._compat import new_class
-from ._make import _make_ne
-
-
-_operation_names = {"eq": "==", "lt": "<", "le": "<=", "gt": ">", "ge": ">="}
-
-
-def cmp_using(
-    eq=None,
-    lt=None,
-    le=None,
-    gt=None,
-    ge=None,
-    require_same_type=True,
-    class_name="Comparable",
-):
-    """
-    Create a class that can be passed into `attr.ib`'s ``eq``, ``order``, and
-    ``cmp`` arguments to customize field comparison.
-
-    The resulting class will have a full set of ordering methods if
-    at least one of ``{lt, le, gt, ge}`` and ``eq``  are provided.
-
-    :param Optional[callable] eq: `callable` used to evaluate equality
-        of two objects.
-    :param Optional[callable] lt: `callable` used to evaluate whether
-        one object is less than another object.
-    :param Optional[callable] le: `callable` used to evaluate whether
-        one object is less than or equal to another object.
-    :param Optional[callable] gt: `callable` used to evaluate whether
-        one object is greater than another object.
-    :param Optional[callable] ge: `callable` used to evaluate whether
-        one object is greater than or equal to another object.
-
-    :param bool require_same_type: When `True`, equality and ordering methods
-        will return `NotImplemented` if objects are not of the same type.
-
-    :param Optional[str] class_name: Name of class. Defaults to 'Comparable'.
-
-    See `comparison` for more details.
-
-    .. versionadded:: 21.1.0
-    """
-
-    body = {
-        "__slots__": ["value"],
-        "__init__": _make_init(),
-        "_requirements": [],
-        "_is_comparable_to": _is_comparable_to,
-    }
-
-    # Add operations.
-    num_order_functions = 0
-    has_eq_function = False
-
-    if eq is not None:
-        has_eq_function = True
-        body["__eq__"] = _make_operator("eq", eq)
-        body["__ne__"] = _make_ne()
-
-    if lt is not None:
-        num_order_functions += 1
-        body["__lt__"] = _make_operator("lt", lt)
-
-    if le is not None:
-        num_order_functions += 1
-        body["__le__"] = _make_operator("le", le)
-
-    if gt is not None:
-        num_order_functions += 1
-        body["__gt__"] = _make_operator("gt", gt)
-
-    if ge is not None:
-        num_order_functions += 1
-        body["__ge__"] = _make_operator("ge", ge)
-
-    type_ = new_class(class_name, (object,), {}, lambda ns: ns.update(body))
-
-    # Add same type requirement.
-    if require_same_type:
-        type_._requirements.append(_check_same_type)
-
-    # Add total ordering if at least one operation was defined.
-    if 0 < num_order_functions < 4:
-        if not has_eq_function:
-            # functools.total_ordering requires __eq__ to be defined,
-            # so raise early error here to keep a nice stack.
-            raise ValueError(
-                "eq must be define is order to complete ordering from "
-                "lt, le, gt, ge."
-            )
-        type_ = functools.total_ordering(type_)
-
-    return type_
-
-
-def _make_init():
-    """
-    Create __init__ method.
-    """
-
-    def __init__(self, value):
-        """
-        Initialize object with *value*.
-        """
-        self.value = value
-
-    return __init__
-
-
-def _make_operator(name, func):
-    """
-    Create operator method.
-    """
-
-    def method(self, other):
-        if not self._is_comparable_to(other):
-            return NotImplemented
-
-        result = func(self.value, other.value)
-        if result is NotImplemented:
-            return NotImplemented
-
-        return result
-
-    method.__name__ = "__%s__" % (name,)
-    method.__doc__ = "Return a %s b.  Computed by attrs." % (
-        _operation_names[name],
-    )
-
-    return method
-
-
-def _is_comparable_to(self, other):
-    """
-    Check whether `other` is comparable to `self`.
-    """
-    for func in self._requirements:
-        if not func(self, other):
-            return False
-    return True
-
-
-def _check_same_type(self, other):
-    """
-    Return True if *self* and *other* are of the same type, False otherwise.
-    """
-    return other.value.__class__ is self.value.__class__
diff --git a/contrib/python/attrs/attr/_cmp.pyi b/contrib/python/attrs/attr/_cmp.pyi
deleted file mode 100644
index 7093550f0f8..00000000000
--- a/contrib/python/attrs/attr/_cmp.pyi
+++ /dev/null
@@ -1,14 +0,0 @@
-from typing import Type
-
-from . import _CompareWithType
-
-
-def cmp_using(
-    eq: Optional[_CompareWithType],
-    lt: Optional[_CompareWithType],
-    le: Optional[_CompareWithType],
-    gt: Optional[_CompareWithType],
-    ge: Optional[_CompareWithType],
-    require_same_type: bool,
-    class_name: str,
-) -> Type: ...
diff --git a/contrib/python/attrs/attr/_compat.py b/contrib/python/attrs/attr/_compat.py
deleted file mode 100644
index 6939f338dad..00000000000
--- a/contrib/python/attrs/attr/_compat.py
+++ /dev/null
@@ -1,242 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-import platform
-import sys
-import types
-import warnings
-
-
-PY2 = sys.version_info[0] == 2
-PYPY = platform.python_implementation() == "PyPy"
-
-
-if PYPY or sys.version_info[:2] >= (3, 6):
-    ordered_dict = dict
-else:
-    from collections import OrderedDict
-
-    ordered_dict = OrderedDict
-
-
-if PY2:
-    from collections import Mapping, Sequence
-
-    from UserDict import IterableUserDict
-
-    # We 'bundle' isclass instead of using inspect as importing inspect is
-    # fairly expensive (order of 10-15 ms for a modern machine in 2016)
-    def isclass(klass):
-        return isinstance(klass, (type, types.ClassType))
-
-    def new_class(name, bases, kwds, exec_body):
-        """
-        A minimal stub of types.new_class that we need for make_class.
-        """
-        ns = {}
-        exec_body(ns)
-
-        return type(name, bases, ns)
-
-    # TYPE is used in exceptions, repr(int) is different on Python 2 and 3.
-    TYPE = "type"
-
-    def iteritems(d):
-        return d.iteritems()
-
-    # Python 2 is bereft of a read-only dict proxy, so we make one!
-    class ReadOnlyDict(IterableUserDict):
-        """
-        Best-effort read-only dict wrapper.
-        """
-
-        def __setitem__(self, key, val):
-            # We gently pretend we're a Python 3 mappingproxy.
-            raise TypeError(
-                "'mappingproxy' object does not support item assignment"
-            )
-
-        def update(self, _):
-            # We gently pretend we're a Python 3 mappingproxy.
-            raise AttributeError(
-                "'mappingproxy' object has no attribute 'update'"
-            )
-
-        def __delitem__(self, _):
-            # We gently pretend we're a Python 3 mappingproxy.
-            raise TypeError(
-                "'mappingproxy' object does not support item deletion"
-            )
-
-        def clear(self):
-            # We gently pretend we're a Python 3 mappingproxy.
-            raise AttributeError(
-                "'mappingproxy' object has no attribute 'clear'"
-            )
-
-        def pop(self, key, default=None):
-            # We gently pretend we're a Python 3 mappingproxy.
-            raise AttributeError(
-                "'mappingproxy' object has no attribute 'pop'"
-            )
-
-        def popitem(self):
-            # We gently pretend we're a Python 3 mappingproxy.
-            raise AttributeError(
-                "'mappingproxy' object has no attribute 'popitem'"
-            )
-
-        def setdefault(self, key, default=None):
-            # We gently pretend we're a Python 3 mappingproxy.
-            raise AttributeError(
-                "'mappingproxy' object has no attribute 'setdefault'"
-            )
-
-        def __repr__(self):
-            # Override to be identical to the Python 3 version.
-            return "mappingproxy(" + repr(self.data) + ")"
-
-    def metadata_proxy(d):
-        res = ReadOnlyDict()
-        res.data.update(d)  # We blocked update, so we have to do it like this.
-        return res
-
-    def just_warn(*args, **kw):  # pragma: no cover
-        """
-        We only warn on Python 3 because we are not aware of any concrete
-        consequences of not setting the cell on Python 2.
-        """
-
-
-else:  # Python 3 and later.
-    from collections.abc import Mapping, Sequence  # noqa
-
-    def just_warn(*args, **kw):
-        """
-        We only warn on Python 3 because we are not aware of any concrete
-        consequences of not setting the cell on Python 2.
-        """
-        warnings.warn(
-            "Running interpreter doesn't sufficiently support code object "
-            "introspection.  Some features like bare super() or accessing "
-            "__class__ will not work with slotted classes.",
-            RuntimeWarning,
-            stacklevel=2,
-        )
-
-    def isclass(klass):
-        return isinstance(klass, type)
-
-    TYPE = "class"
-
-    def iteritems(d):
-        return d.items()
-
-    new_class = types.new_class
-
-    def metadata_proxy(d):
-        return types.MappingProxyType(dict(d))
-
-
-def make_set_closure_cell():
-    """Return a function of two arguments (cell, value) which sets
-    the value stored in the closure cell `cell` to `value`.
-    """
-    # pypy makes this easy. (It also supports the logic below, but
-    # why not do the easy/fast thing?)
-    if PYPY:
-
-        def set_closure_cell(cell, value):
-            cell.__setstate__((value,))
-
-        return set_closure_cell
-
-    # Otherwise gotta do it the hard way.
-
-    # Create a function that will set its first cellvar to `value`.
-    def set_first_cellvar_to(value):
-        x = value
-        return
-
-        # This function will be eliminated as dead code, but
-        # not before its reference to `x` forces `x` to be
-        # represented as a closure cell rather than a local.
-        def force_x_to_be_a_cell():  # pragma: no cover
-            return x
-
-    try:
-        # Extract the code object and make sure our assumptions about
-        # the closure behavior are correct.
-        if PY2:
-            co = set_first_cellvar_to.func_code
-        else:
-            co = set_first_cellvar_to.__code__
-        if co.co_cellvars != ("x",) or co.co_freevars != ():
-            raise AssertionError  # pragma: no cover
-
-        # Convert this code object to a code object that sets the
-        # function's first _freevar_ (not cellvar) to the argument.
-        if sys.version_info >= (3, 8):
-            # CPython 3.8+ has an incompatible CodeType signature
-            # (added a posonlyargcount argument) but also added
-            # CodeType.replace() to do this without counting parameters.
-            set_first_freevar_code = co.replace(
-                co_cellvars=co.co_freevars, co_freevars=co.co_cellvars
-            )
-        else:
-            args = [co.co_argcount]
-            if not PY2:
-                args.append(co.co_kwonlyargcount)
-            args.extend(
-                [
-                    co.co_nlocals,
-                    co.co_stacksize,
-                    co.co_flags,
-                    co.co_code,
-                    co.co_consts,
-                    co.co_names,
-                    co.co_varnames,
-                    co.co_filename,
-                    co.co_name,
-                    co.co_firstlineno,
-                    co.co_lnotab,
-                    # These two arguments are reversed:
-                    co.co_cellvars,
-                    co.co_freevars,
-                ]
-            )
-            set_first_freevar_code = types.CodeType(*args)
-
-        def set_closure_cell(cell, value):
-            # Create a function using the set_first_freevar_code,
-            # whose first closure cell is `cell`. Calling it will
-            # change the value of that cell.
-            setter = types.FunctionType(
-                set_first_freevar_code, {}, "setter", (), (cell,)
-            )
-            # And call it to set the cell.
-            setter(value)
-
-        # Make sure it works on this interpreter:
-        def make_func_with_cell():
-            x = None
-
-            def func():
-                return x  # pragma: no cover
-
-            return func
-
-        if PY2:
-            cell = make_func_with_cell().func_closure[0]
-        else:
-            cell = make_func_with_cell().__closure__[0]
-        set_closure_cell(cell, 100)
-        if cell.cell_contents != 100:
-            raise AssertionError  # pragma: no cover
-
-    except Exception:
-        return just_warn
-    else:
-        return set_closure_cell
-
-
-set_closure_cell = make_set_closure_cell()
diff --git a/contrib/python/attrs/attr/_config.py b/contrib/python/attrs/attr/_config.py
deleted file mode 100644
index 8ec920962d1..00000000000
--- a/contrib/python/attrs/attr/_config.py
+++ /dev/null
@@ -1,23 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-
-__all__ = ["set_run_validators", "get_run_validators"]
-
-_run_validators = True
-
-
-def set_run_validators(run):
-    """
-    Set whether or not validators are run.  By default, they are run.
-    """
-    if not isinstance(run, bool):
-        raise TypeError("'run' must be bool.")
-    global _run_validators
-    _run_validators = run
-
-
-def get_run_validators():
-    """
-    Return whether or not validators are run.
-    """
-    return _run_validators
diff --git a/contrib/python/attrs/attr/_funcs.py b/contrib/python/attrs/attr/_funcs.py
deleted file mode 100644
index fda508c5c4b..00000000000
--- a/contrib/python/attrs/attr/_funcs.py
+++ /dev/null
@@ -1,395 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-import copy
-
-from ._compat import iteritems
-from ._make import NOTHING, _obj_setattr, fields
-from .exceptions import AttrsAttributeNotFoundError
-
-
-def asdict(
-    inst,
-    recurse=True,
-    filter=None,
-    dict_factory=dict,
-    retain_collection_types=False,
-    value_serializer=None,
-):
-    """
-    Return the ``attrs`` attribute values of *inst* as a dict.
-
-    Optionally recurse into other ``attrs``-decorated classes.
-
-    :param inst: Instance of an ``attrs``-decorated class.
-    :param bool recurse: Recurse into classes that are also
-        ``attrs``-decorated.
-    :param callable filter: A callable whose return code determines whether an
-        attribute or element is included (``True``) or dropped (``False``).  Is
-        called with the `attr.Attribute` as the first argument and the
-        value as the second argument.
-    :param callable dict_factory: A callable to produce dictionaries from.  For
-        example, to produce ordered dictionaries instead of normal Python
-        dictionaries, pass in ``collections.OrderedDict``.
-    :param bool retain_collection_types: Do not convert to ``list`` when
-        encountering an attribute whose type is ``tuple`` or ``set``.  Only
-        meaningful if ``recurse`` is ``True``.
-    :param Optional[callable] value_serializer: A hook that is called for every
-        attribute or dict key/value.  It receives the current instance, field
-        and value and must return the (updated) value.  The hook is run *after*
-        the optional *filter* has been applied.
-
-    :rtype: return type of *dict_factory*
-
-    :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs``
-        class.
-
-    ..  versionadded:: 16.0.0 *dict_factory*
-    ..  versionadded:: 16.1.0 *retain_collection_types*
-    ..  versionadded:: 20.3.0 *value_serializer*
-    """
-    attrs = fields(inst.__class__)
-    rv = dict_factory()
-    for a in attrs:
-        v = getattr(inst, a.name)
-        if filter is not None and not filter(a, v):
-            continue
-
-        if value_serializer is not None:
-            v = value_serializer(inst, a, v)
-
-        if recurse is True:
-            if has(v.__class__):
-                rv[a.name] = asdict(
-                    v,
-                    True,
-                    filter,
-                    dict_factory,
-                    retain_collection_types,
-                    value_serializer,
-                )
-            elif isinstance(v, (tuple, list, set, frozenset)):
-                cf = v.__class__ if retain_collection_types is True else list
-                rv[a.name] = cf(
-                    [
-                        _asdict_anything(
-                            i,
-                            filter,
-                            dict_factory,
-                            retain_collection_types,
-                            value_serializer,
-                        )
-                        for i in v
-                    ]
-                )
-            elif isinstance(v, dict):
-                df = dict_factory
-                rv[a.name] = df(
-                    (
-                        _asdict_anything(
-                            kk,
-                            filter,
-                            df,
-                            retain_collection_types,
-                            value_serializer,
-                        ),
-                        _asdict_anything(
-                            vv,
-                            filter,
-                            df,
-                            retain_collection_types,
-                            value_serializer,
-                        ),
-                    )
-                    for kk, vv in iteritems(v)
-                )
-            else:
-                rv[a.name] = v
-        else:
-            rv[a.name] = v
-    return rv
-
-
-def _asdict_anything(
-    val,
-    filter,
-    dict_factory,
-    retain_collection_types,
-    value_serializer,
-):
-    """
-    ``asdict`` only works on attrs instances, this works on anything.
-    """
-    if getattr(val.__class__, "__attrs_attrs__", None) is not None:
-        # Attrs class.
-        rv = asdict(
-            val,
-            True,
-            filter,
-            dict_factory,
-            retain_collection_types,
-            value_serializer,
-        )
-    elif isinstance(val, (tuple, list, set, frozenset)):
-        cf = val.__class__ if retain_collection_types is True else list
-        rv = cf(
-            [
-                _asdict_anything(
-                    i,
-                    filter,
-                    dict_factory,
-                    retain_collection_types,
-                    value_serializer,
-                )
-                for i in val
-            ]
-        )
-    elif isinstance(val, dict):
-        df = dict_factory
-        rv = df(
-            (
-                _asdict_anything(
-                    kk, filter, df, retain_collection_types, value_serializer
-                ),
-                _asdict_anything(
-                    vv, filter, df, retain_collection_types, value_serializer
-                ),
-            )
-            for kk, vv in iteritems(val)
-        )
-    else:
-        rv = val
-        if value_serializer is not None:
-            rv = value_serializer(None, None, rv)
-
-    return rv
-
-
-def astuple(
-    inst,
-    recurse=True,
-    filter=None,
-    tuple_factory=tuple,
-    retain_collection_types=False,
-):
-    """
-    Return the ``attrs`` attribute values of *inst* as a tuple.
-
-    Optionally recurse into other ``attrs``-decorated classes.
-
-    :param inst: Instance of an ``attrs``-decorated class.
-    :param bool recurse: Recurse into classes that are also
-        ``attrs``-decorated.
-    :param callable filter: A callable whose return code determines whether an
-        attribute or element is included (``True``) or dropped (``False``).  Is
-        called with the `attr.Attribute` as the first argument and the
-        value as the second argument.
-    :param callable tuple_factory: A callable to produce tuples from.  For
-        example, to produce lists instead of tuples.
-    :param bool retain_collection_types: Do not convert to ``list``
-        or ``dict`` when encountering an attribute which type is
-        ``tuple``, ``dict`` or ``set``.  Only meaningful if ``recurse`` is
-        ``True``.
-
-    :rtype: return type of *tuple_factory*
-
-    :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs``
-        class.
-
-    ..  versionadded:: 16.2.0
-    """
-    attrs = fields(inst.__class__)
-    rv = []
-    retain = retain_collection_types  # Very long. :/
-    for a in attrs:
-        v = getattr(inst, a.name)
-        if filter is not None and not filter(a, v):
-            continue
-        if recurse is True:
-            if has(v.__class__):
-                rv.append(
-                    astuple(
-                        v,
-                        recurse=True,
-                        filter=filter,
-                        tuple_factory=tuple_factory,
-                        retain_collection_types=retain,
-                    )
-                )
-            elif isinstance(v, (tuple, list, set, frozenset)):
-                cf = v.__class__ if retain is True else list
-                rv.append(
-                    cf(
-                        [
-                            astuple(
-                                j,
-                                recurse=True,
-                                filter=filter,
-                                tuple_factory=tuple_factory,
-                                retain_collection_types=retain,
-                            )
-                            if has(j.__class__)
-                            else j
-                            for j in v
-                        ]
-                    )
-                )
-            elif isinstance(v, dict):
-                df = v.__class__ if retain is True else dict
-                rv.append(
-                    df(
-                        (
-                            astuple(
-                                kk,
-                                tuple_factory=tuple_factory,
-                                retain_collection_types=retain,
-                            )
-                            if has(kk.__class__)
-                            else kk,
-                            astuple(
-                                vv,
-                                tuple_factory=tuple_factory,
-                                retain_collection_types=retain,
-                            )
-                            if has(vv.__class__)
-                            else vv,
-                        )
-                        for kk, vv in iteritems(v)
-                    )
-                )
-            else:
-                rv.append(v)
-        else:
-            rv.append(v)
-
-    return rv if tuple_factory is list else tuple_factory(rv)
-
-
-def has(cls):
-    """
-    Check whether *cls* is a class with ``attrs`` attributes.
-
-    :param type cls: Class to introspect.
-    :raise TypeError: If *cls* is not a class.
-
-    :rtype: bool
-    """
-    return getattr(cls, "__attrs_attrs__", None) is not None
-
-
-def assoc(inst, **changes):
-    """
-    Copy *inst* and apply *changes*.
-
-    :param inst: Instance of a class with ``attrs`` attributes.
-    :param changes: Keyword changes in the new copy.
-
-    :return: A copy of inst with *changes* incorporated.
-
-    :raise attr.exceptions.AttrsAttributeNotFoundError: If *attr_name* couldn't
-        be found on *cls*.
-    :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs``
-        class.
-
-    ..  deprecated:: 17.1.0
-        Use `evolve` instead.
-    """
-    import warnings
-
-    warnings.warn(
-        "assoc is deprecated and will be removed after 2018/01.",
-        DeprecationWarning,
-        stacklevel=2,
-    )
-    new = copy.copy(inst)
-    attrs = fields(inst.__class__)
-    for k, v in iteritems(changes):
-        a = getattr(attrs, k, NOTHING)
-        if a is NOTHING:
-            raise AttrsAttributeNotFoundError(
-                "{k} is not an attrs attribute on {cl}.".format(
-                    k=k, cl=new.__class__
-                )
-            )
-        _obj_setattr(new, k, v)
-    return new
-
-
-def evolve(inst, **changes):
-    """
-    Create a new instance, based on *inst* with *changes* applied.
-
-    :param inst: Instance of a class with ``attrs`` attributes.
-    :param changes: Keyword changes in the new copy.
-
-    :return: A copy of inst with *changes* incorporated.
-
-    :raise TypeError: If *attr_name* couldn't be found in the class
-        ``__init__``.
-    :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs``
-        class.
-
-    ..  versionadded:: 17.1.0
-    """
-    cls = inst.__class__
-    attrs = fields(cls)
-    for a in attrs:
-        if not a.init:
-            continue
-        attr_name = a.name  # To deal with private attributes.
-        init_name = attr_name if attr_name[0] != "_" else attr_name[1:]
-        if init_name not in changes:
-            changes[init_name] = getattr(inst, attr_name)
-
-    return cls(**changes)
-
-
-def resolve_types(cls, globalns=None, localns=None, attribs=None):
-    """
-    Resolve any strings and forward annotations in type annotations.
-
-    This is only required if you need concrete types in `Attribute`'s *type*
-    field. In other words, you don't need to resolve your types if you only
-    use them for static type checking.
-
-    With no arguments, names will be looked up in the module in which the class
-    was created. If this is not what you want, e.g. if the name only exists
-    inside a method, you may pass *globalns* or *localns* to specify other
-    dictionaries in which to look up these names. See the docs of
-    `typing.get_type_hints` for more details.
-
-    :param type cls: Class to resolve.
-    :param Optional[dict] globalns: Dictionary containing global variables.
-    :param Optional[dict] localns: Dictionary containing local variables.
-    :param Optional[list] attribs: List of attribs for the given class.
-        This is necessary when calling from inside a ``field_transformer``
-        since *cls* is not an ``attrs`` class yet.
-
-    :raise TypeError: If *cls* is not a class.
-    :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs``
-        class and you didn't pass any attribs.
-    :raise NameError: If types cannot be resolved because of missing variables.
-
-    :returns: *cls* so you can use this function also as a class decorator.
-        Please note that you have to apply it **after** `attr.s`. That means
-        the decorator has to come in the line **before** `attr.s`.
-
-    ..  versionadded:: 20.1.0
-    ..  versionadded:: 21.1.0 *attribs*
-
-    """
-    try:
-        # Since calling get_type_hints is expensive we cache whether we've
-        # done it already.
-        cls.__attrs_types_resolved__
-    except AttributeError:
-        import typing
-
-        hints = typing.get_type_hints(cls, globalns=globalns, localns=localns)
-        for field in fields(cls) if attribs is None else attribs:
-            if field.name in hints:
-                # Since fields have been frozen we must work around it.
-                _obj_setattr(field, "type", hints[field.name])
-        cls.__attrs_types_resolved__ = True
-
-    # Return the class so you can use it as a decorator too.
-    return cls
diff --git a/contrib/python/attrs/attr/_make.py b/contrib/python/attrs/attr/_make.py
deleted file mode 100644
index a1912b1233f..00000000000
--- a/contrib/python/attrs/attr/_make.py
+++ /dev/null
@@ -1,3052 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-import copy
-import inspect
-import linecache
-import sys
-import threading
-import uuid
-import warnings
-
-from operator import itemgetter
-
-from . import _config, setters
-from ._compat import (
-    PY2,
-    PYPY,
-    isclass,
-    iteritems,
-    metadata_proxy,
-    new_class,
-    ordered_dict,
-    set_closure_cell,
-)
-from .exceptions import (
-    DefaultAlreadySetError,
-    FrozenInstanceError,
-    NotAnAttrsClassError,
-    PythonTooOldError,
-    UnannotatedAttributeError,
-)
-
-
-if not PY2:
-    import typing
-
-
-# This is used at least twice, so cache it here.
-_obj_setattr = object.__setattr__
-_init_converter_pat = "__attr_converter_%s"
-_init_factory_pat = "__attr_factory_{}"
-_tuple_property_pat = (
-    "    {attr_name} = _attrs_property(_attrs_itemgetter({index}))"
-)
-_classvar_prefixes = (
-    "typing.ClassVar",
-    "t.ClassVar",
-    "ClassVar",
-    "typing_extensions.ClassVar",
-)
-# we don't use a double-underscore prefix because that triggers
-# name mangling when trying to create a slot for the field
-# (when slots=True)
-_hash_cache_field = "_attrs_cached_hash"
-
-_empty_metadata_singleton = metadata_proxy({})
-
-# Unique object for unequivocal getattr() defaults.
-_sentinel = object()
-
-
-class _Nothing(object):
-    """
-    Sentinel class to indicate the lack of a value when ``None`` is ambiguous.
-
-    ``_Nothing`` is a singleton. There is only ever one of it.
-
-    .. versionchanged:: 21.1.0 ``bool(NOTHING)`` is now False.
-    """
-
-    _singleton = None
-
-    def __new__(cls):
-        if _Nothing._singleton is None:
-            _Nothing._singleton = super(_Nothing, cls).__new__(cls)
-        return _Nothing._singleton
-
-    def __repr__(self):
-        return "NOTHING"
-
-    def __bool__(self):
-        return False
-
-    def __len__(self):
-        return 0  # __bool__ for Python 2
-
-
-NOTHING = _Nothing()
-"""
-Sentinel to indicate the lack of a value when ``None`` is ambiguous.
-"""
-
-
-class _CacheHashWrapper(int):
-    """
-    An integer subclass that pickles / copies as None
-
-    This is used for non-slots classes with ``cache_hash=True``, to avoid
-    serializing a potentially (even likely) invalid hash value. Since ``None``
-    is the default value for uncalculated hashes, whenever this is copied,
-    the copy's value for the hash should automatically reset.
-
-    See GH #613 for more details.
-    """
-
-    if PY2:
-        # For some reason `type(None)` isn't callable in Python 2, but we don't
-        # actually need a constructor for None objects, we just need any
-        # available function that returns None.
-        def __reduce__(self, _none_constructor=getattr, _args=(0, "", None)):
-            return _none_constructor, _args
-
-    else:
-
-        def __reduce__(self, _none_constructor=type(None), _args=()):
-            return _none_constructor, _args
-
-
-def attrib(
-    default=NOTHING,
-    validator=None,
-    repr=True,
-    cmp=None,
-    hash=None,
-    init=True,
-    metadata=None,
-    type=None,
-    converter=None,
-    factory=None,
-    kw_only=False,
-    eq=None,
-    order=None,
-    on_setattr=None,
-):
-    """
-    Create a new attribute on a class.
-
-    ..  warning::
-
-        Does *not* do anything unless the class is also decorated with
-        `attr.s`!
-
-    :param default: A value that is used if an ``attrs``-generated ``__init__``
-        is used and no value is passed while instantiating or the attribute is
-        excluded using ``init=False``.
-
-        If the value is an instance of `Factory`, its callable will be
-        used to construct a new value (useful for mutable data types like lists
-        or dicts).
-
-        If a default is not set (or set manually to `attr.NOTHING`), a value
-        *must* be supplied when instantiating; otherwise a `TypeError`
-        will be raised.
-
-        The default can also be set using decorator notation as shown below.
-
-    :type default: Any value
-
-    :param callable factory: Syntactic sugar for
-        ``default=attr.Factory(factory)``.
-
-    :param validator: `callable` that is called by ``attrs``-generated
-        ``__init__`` methods after the instance has been initialized.  They
-        receive the initialized instance, the `Attribute`, and the
-        passed value.
-
-        The return value is *not* inspected so the validator has to throw an
-        exception itself.
-
-        If a `list` is passed, its items are treated as validators and must
-        all pass.
-
-        Validators can be globally disabled and re-enabled using
-        `get_run_validators`.
-
-        The validator can also be set using decorator notation as shown below.
-
-    :type validator: `callable` or a `list` of `callable`\\ s.
-
-    :param repr: Include this attribute in the generated ``__repr__``
-        method. If ``True``, include the attribute; if ``False``, omit it. By
-        default, the built-in ``repr()`` function is used. To override how the
-        attribute value is formatted, pass a ``callable`` that takes a single
-        value and returns a string. Note that the resulting string is used
-        as-is, i.e. it will be used directly *instead* of calling ``repr()``
-        (the default).
-    :type repr: a `bool` or a `callable` to use a custom function.
-
-    :param eq: If ``True`` (default), include this attribute in the
-        generated ``__eq__`` and ``__ne__`` methods that check two instances
-        for equality. To override how the attribute value is compared,
-        pass a ``callable`` that takes a single value and returns the value
-        to be compared.
-    :type eq: a `bool` or a `callable`.
-
-    :param order: If ``True`` (default), include this attributes in the
-        generated ``__lt__``, ``__le__``, ``__gt__`` and ``__ge__`` methods.
-        To override how the attribute value is ordered,
-        pass a ``callable`` that takes a single value and returns the value
-        to be ordered.
-    :type order: a `bool` or a `callable`.
-
-    :param cmp: Setting *cmp* is equivalent to setting *eq* and *order* to the
-        same value. Must not be mixed with *eq* or *order*.
-    :type cmp: a `bool` or a `callable`.
-
-    :param Optional[bool] hash: Include this attribute in the generated
-        ``__hash__`` method.  If ``None`` (default), mirror *eq*'s value.  This
-        is the correct behavior according the Python spec.  Setting this value
-        to anything else than ``None`` is *discouraged*.
-    :param bool init: Include this attribute in the generated ``__init__``
-        method.  It is possible to set this to ``False`` and set a default
-        value.  In that case this attributed is unconditionally initialized
-        with the specified default value or factory.
-    :param callable converter: `callable` that is called by
-        ``attrs``-generated ``__init__`` methods to convert attribute's value
-        to the desired format.  It is given the passed-in value, and the
-        returned value will be used as the new value of the attribute.  The
-        value is converted before being passed to the validator, if any.
-    :param metadata: An arbitrary mapping, to be used by third-party
-        components.  See `extending_metadata`.
-    :param type: The type of the attribute.  In Python 3.6 or greater, the
-        preferred method to specify the type is using a variable annotation
-        (see `PEP 526 <https://www.python.org/dev/peps/pep-0526/>`_).
-        This argument is provided for backward compatibility.
-        Regardless of the approach used, the type will be stored on
-        ``Attribute.type``.
-
-        Please note that ``attrs`` doesn't do anything with this metadata by
-        itself. You can use it as part of your own code or for
-        `static type checking <types>`.
-    :param kw_only: Make this attribute keyword-only (Python 3+)
-        in the generated ``__init__`` (if ``init`` is ``False``, this
-        parameter is ignored).
-    :param on_setattr: Allows to overwrite the *on_setattr* setting from
-        `attr.s`. If left `None`, the *on_setattr* value from `attr.s` is used.
-        Set to `attr.setters.NO_OP` to run **no** `setattr` hooks for this
-        attribute -- regardless of the setting in `attr.s`.
-    :type on_setattr: `callable`, or a list of callables, or `None`, or
-        `attr.setters.NO_OP`
-
-    .. versionadded:: 15.2.0 *convert*
-    .. versionadded:: 16.3.0 *metadata*
-    .. versionchanged:: 17.1.0 *validator* can be a ``list`` now.
-    .. versionchanged:: 17.1.0
-       *hash* is ``None`` and therefore mirrors *eq* by default.
-    .. versionadded:: 17.3.0 *type*
-    .. deprecated:: 17.4.0 *convert*
-    .. versionadded:: 17.4.0 *converter* as a replacement for the deprecated
-       *convert* to achieve consistency with other noun-based arguments.
-    .. versionadded:: 18.1.0
-       ``factory=f`` is syntactic sugar for ``default=attr.Factory(f)``.
-    .. versionadded:: 18.2.0 *kw_only*
-    .. versionchanged:: 19.2.0 *convert* keyword argument removed.
-    .. versionchanged:: 19.2.0 *repr* also accepts a custom callable.
-    .. deprecated:: 19.2.0 *cmp* Removal on or after 2021-06-01.
-    .. versionadded:: 19.2.0 *eq* and *order*
-    .. versionadded:: 20.1.0 *on_setattr*
-    .. versionchanged:: 20.3.0 *kw_only* backported to Python 2
-    .. versionchanged:: 21.1.0
-       *eq*, *order*, and *cmp* also accept a custom callable
-    .. versionchanged:: 21.1.0 *cmp* undeprecated
-    """
-    eq, eq_key, order, order_key = _determine_attrib_eq_order(
-        cmp, eq, order, True
-    )
-
-    if hash is not None and hash is not True and hash is not False:
-        raise TypeError(
-            "Invalid value for hash.  Must be True, False, or None."
-        )
-
-    if factory is not None:
-        if default is not NOTHING:
-            raise ValueError(
-                "The `default` and `factory` arguments are mutually "
-                "exclusive."
-            )
-        if not callable(factory):
-            raise ValueError("The `factory` argument must be a callable.")
-        default = Factory(factory)
-
-    if metadata is None:
-        metadata = {}
-
-    # Apply syntactic sugar by auto-wrapping.
-    if isinstance(on_setattr, (list, tuple)):
-        on_setattr = setters.pipe(*on_setattr)
-
-    if validator and isinstance(validator, (list, tuple)):
-        validator = and_(*validator)
-
-    if converter and isinstance(converter, (list, tuple)):
-        converter = pipe(*converter)
-
-    return _CountingAttr(
-        default=default,
-        validator=validator,
-        repr=repr,
-        cmp=None,
-        hash=hash,
-        init=init,
-        converter=converter,
-        metadata=metadata,
-        type=type,
-        kw_only=kw_only,
-        eq=eq,
-        eq_key=eq_key,
-        order=order,
-        order_key=order_key,
-        on_setattr=on_setattr,
-    )
-
-
-def _compile_and_eval(script, globs, locs=None, filename=""):
-    """
-    "Exec" the script with the given global (globs) and local (locs) variables.
-    """
-    bytecode = compile(script, filename, "exec")
-    eval(bytecode, globs, locs)
-
-
-def _make_method(name, script, filename, globs=None):
-    """
-    Create the method with the script given and return the method object.
-    """
-    locs = {}
-    if globs is None:
-        globs = {}
-
-    _compile_and_eval(script, globs, locs, filename)
-
-    # In order of debuggers like PDB being able to step through the code,
-    # we add a fake linecache entry.
-    linecache.cache[filename] = (
-        len(script),
-        None,
-        script.splitlines(True),
-        filename,
-    )
-
-    return locs[name]
-
-
-def _make_attr_tuple_class(cls_name, attr_names):
-    """
-    Create a tuple subclass to hold `Attribute`s for an `attrs` class.
-
-    The subclass is a bare tuple with properties for names.
-
-    class MyClassAttributes(tuple):
-        __slots__ = ()
-        x = property(itemgetter(0))
-    """
-    attr_class_name = "{}Attributes".format(cls_name)
-    attr_class_template = [
-        "class {}(tuple):".format(attr_class_name),
-        "    __slots__ = ()",
-    ]
-    if attr_names:
-        for i, attr_name in enumerate(attr_names):
-            attr_class_template.append(
-                _tuple_property_pat.format(index=i, attr_name=attr_name)
-            )
-    else:
-        attr_class_template.append("    pass")
-    globs = {"_attrs_itemgetter": itemgetter, "_attrs_property": property}
-    _compile_and_eval("\n".join(attr_class_template), globs)
-    return globs[attr_class_name]
-
-
-# Tuple class for extracted attributes from a class definition.
-# `base_attrs` is a subset of `attrs`.
-_Attributes = _make_attr_tuple_class(
-    "_Attributes",
-    [
-        # all attributes to build dunder methods for
-        "attrs",
-        # attributes that have been inherited
-        "base_attrs",
-        # map inherited attributes to their originating classes
-        "base_attrs_map",
-    ],
-)
-
-
-def _is_class_var(annot):
-    """
-    Check whether *annot* is a typing.ClassVar.
-
-    The string comparison hack is used to avoid evaluating all string
-    annotations which would put attrs-based classes at a performance
-    disadvantage compared to plain old classes.
-    """
-    annot = str(annot)
-
-    # Annotation can be quoted.
-    if annot.startswith(("'", '"')) and annot.endswith(("'", '"')):
-        annot = annot[1:-1]
-
-    return annot.startswith(_classvar_prefixes)
-
-
-def _has_own_attribute(cls, attrib_name):
-    """
-    Check whether *cls* defines *attrib_name* (and doesn't just inherit it).
-
-    Requires Python 3.
-    """
-    attr = getattr(cls, attrib_name, _sentinel)
-    if attr is _sentinel:
-        return False
-
-    for base_cls in cls.__mro__[1:]:
-        a = getattr(base_cls, attrib_name, None)
-        if attr is a:
-            return False
-
-    return True
-
-
-def _get_annotations(cls):
-    """
-    Get annotations for *cls*.
-    """
-    if _has_own_attribute(cls, "__annotations__"):
-        return cls.__annotations__
-
-    return {}
-
-
-def _counter_getter(e):
-    """
-    Key function for sorting to avoid re-creating a lambda for every class.
-    """
-    return e[1].counter
-
-
-def _collect_base_attrs(cls, taken_attr_names):
-    """
-    Collect attr.ibs from base classes of *cls*, except *taken_attr_names*.
-    """
-    base_attrs = []
-    base_attr_map = {}  # A dictionary of base attrs to their classes.
-
-    # Traverse the MRO and collect attributes.
-    for base_cls in reversed(cls.__mro__[1:-1]):
-        for a in getattr(base_cls, "__attrs_attrs__", []):
-            if a.inherited or a.name in taken_attr_names:
-                continue
-
-            a = a.evolve(inherited=True)
-            base_attrs.append(a)
-            base_attr_map[a.name] = base_cls
-
-    # For each name, only keep the freshest definition i.e. the furthest at the
-    # back.  base_attr_map is fine because it gets overwritten with every new
-    # instance.
-    filtered = []
-    seen = set()
-    for a in reversed(base_attrs):
-        if a.name in seen:
-            continue
-        filtered.insert(0, a)
-        seen.add(a.name)
-
-    return filtered, base_attr_map
-
-
-def _collect_base_attrs_broken(cls, taken_attr_names):
-    """
-    Collect attr.ibs from base classes of *cls*, except *taken_attr_names*.
-
-    N.B. *taken_attr_names* will be mutated.
-
-    Adhere to the old incorrect behavior.
-
-    Notably it collects from the front and considers inherited attributes which
-    leads to the buggy behavior reported in #428.
-    """
-    base_attrs = []
-    base_attr_map = {}  # A dictionary of base attrs to their classes.
-
-    # Traverse the MRO and collect attributes.
-    for base_cls in cls.__mro__[1:-1]:
-        for a in getattr(base_cls, "__attrs_attrs__", []):
-            if a.name in taken_attr_names:
-                continue
-
-            a = a.evolve(inherited=True)
-            taken_attr_names.add(a.name)
-            base_attrs.append(a)
-            base_attr_map[a.name] = base_cls
-
-    return base_attrs, base_attr_map
-
-
-def _transform_attrs(
-    cls, these, auto_attribs, kw_only, collect_by_mro, field_transformer
-):
-    """
-    Transform all `_CountingAttr`s on a class into `Attribute`s.
-
-    If *these* is passed, use that and don't look for them on the class.
-
-    *collect_by_mro* is True, collect them in the correct MRO order, otherwise
-    use the old -- incorrect -- order.  See #428.
-
-    Return an `_Attributes`.
-    """
-    cd = cls.__dict__
-    anns = _get_annotations(cls)
-
-    if these is not None:
-        ca_list = [(name, ca) for name, ca in iteritems(these)]
-
-        if not isinstance(these, ordered_dict):
-            ca_list.sort(key=_counter_getter)
-    elif auto_attribs is True:
-        ca_names = {
-            name
-            for name, attr in cd.items()
-            if isinstance(attr, _CountingAttr)
-        }
-        ca_list = []
-        annot_names = set()
-        for attr_name, type in anns.items():
-            if _is_class_var(type):
-                continue
-            annot_names.add(attr_name)
-            a = cd.get(attr_name, NOTHING)
-
-            if not isinstance(a, _CountingAttr):
-                if a is NOTHING:
-                    a = attrib()
-                else:
-                    a = attrib(default=a)
-            ca_list.append((attr_name, a))
-
-        unannotated = ca_names - annot_names
-        if len(unannotated) > 0:
-            raise UnannotatedAttributeError(
-                "The following `attr.ib`s lack a type annotation: "
-                + ", ".join(
-                    sorted(unannotated, key=lambda n: cd.get(n).counter)
-                )
-                + "."
-            )
-    else:
-        ca_list = sorted(
-            (
-                (name, attr)
-                for name, attr in cd.items()
-                if isinstance(attr, _CountingAttr)
-            ),
-            key=lambda e: e[1].counter,
-        )
-
-    own_attrs = [
-        Attribute.from_counting_attr(
-            name=attr_name, ca=ca, type=anns.get(attr_name)
-        )
-        for attr_name, ca in ca_list
-    ]
-
-    if collect_by_mro:
-        base_attrs, base_attr_map = _collect_base_attrs(
-            cls, {a.name for a in own_attrs}
-        )
-    else:
-        base_attrs, base_attr_map = _collect_base_attrs_broken(
-            cls, {a.name for a in own_attrs}
-        )
-
-    attr_names = [a.name for a in base_attrs + own_attrs]
-
-    AttrsClass = _make_attr_tuple_class(cls.__name__, attr_names)
-
-    if kw_only:
-        own_attrs = [a.evolve(kw_only=True) for a in own_attrs]
-        base_attrs = [a.evolve(kw_only=True) for a in base_attrs]
-
-    attrs = AttrsClass(base_attrs + own_attrs)
-
-    # Mandatory vs non-mandatory attr order only matters when they are part of
-    # the __init__ signature and when they aren't kw_only (which are moved to
-    # the end and can be mandatory or non-mandatory in any order, as they will
-    # be specified as keyword args anyway). Check the order of those attrs:
-    had_default = False
-    for a in (a for a in attrs if a.init is not False and a.kw_only is False):
-        if had_default is True and a.default is NOTHING:
-            raise ValueError(
-                "No mandatory attributes allowed after an attribute with a "
-                "default value or factory.  Attribute in question: %r" % (a,)
-            )
-
-        if had_default is False and a.default is not NOTHING:
-            had_default = True
-
-    if field_transformer is not None:
-        attrs = field_transformer(cls, attrs)
-    return _Attributes((attrs, base_attrs, base_attr_map))
-
-
-if PYPY:
-
-    def _frozen_setattrs(self, name, value):
-        """
-        Attached to frozen classes as __setattr__.
-        """
-        if isinstance(self, BaseException) and name in (
-            "__cause__",
-            "__context__",
-        ):
-            BaseException.__setattr__(self, name, value)
-            return
-
-        raise FrozenInstanceError()
-
-
-else:
-
-    def _frozen_setattrs(self, name, value):
-        """
-        Attached to frozen classes as __setattr__.
-        """
-        raise FrozenInstanceError()
-
-
-def _frozen_delattrs(self, name):
-    """
-    Attached to frozen classes as __delattr__.
-    """
-    raise FrozenInstanceError()
-
-
-class _ClassBuilder(object):
-    """
-    Iteratively build *one* class.
-    """
-
-    __slots__ = (
-        "_attr_names",
-        "_attrs",
-        "_base_attr_map",
-        "_base_names",
-        "_cache_hash",
-        "_cls",
-        "_cls_dict",
-        "_delete_attribs",
-        "_frozen",
-        "_has_pre_init",
-        "_has_post_init",
-        "_is_exc",
-        "_on_setattr",
-        "_slots",
-        "_weakref_slot",
-        "_has_own_setattr",
-        "_has_custom_setattr",
-    )
-
-    def __init__(
-        self,
-        cls,
-        these,
-        slots,
-        frozen,
-        weakref_slot,
-        getstate_setstate,
-        auto_attribs,
-        kw_only,
-        cache_hash,
-        is_exc,
-        collect_by_mro,
-        on_setattr,
-        has_custom_setattr,
-        field_transformer,
-    ):
-        attrs, base_attrs, base_map = _transform_attrs(
-            cls,
-            these,
-            auto_attribs,
-            kw_only,
-            collect_by_mro,
-            field_transformer,
-        )
-
-        self._cls = cls
-        self._cls_dict = dict(cls.__dict__) if slots else {}
-        self._attrs = attrs
-        self._base_names = set(a.name for a in base_attrs)
-        self._base_attr_map = base_map
-        self._attr_names = tuple(a.name for a in attrs)
-        self._slots = slots
-        self._frozen = frozen
-        self._weakref_slot = weakref_slot
-        self._cache_hash = cache_hash
-        self._has_pre_init = bool(getattr(cls, "__attrs_pre_init__", False))
-        self._has_post_init = bool(getattr(cls, "__attrs_post_init__", False))
-        self._delete_attribs = not bool(these)
-        self._is_exc = is_exc
-        self._on_setattr = on_setattr
-
-        self._has_custom_setattr = has_custom_setattr
-        self._has_own_setattr = False
-
-        self._cls_dict["__attrs_attrs__"] = self._attrs
-
-        if frozen:
-            self._cls_dict["__setattr__"] = _frozen_setattrs
-            self._cls_dict["__delattr__"] = _frozen_delattrs
-
-            self._has_own_setattr = True
-
-        if getstate_setstate:
-            (
-                self._cls_dict["__getstate__"],
-                self._cls_dict["__setstate__"],
-            ) = self._make_getstate_setstate()
-
-    def __repr__(self):
-        return "<_ClassBuilder(cls={cls})>".format(cls=self._cls.__name__)
-
-    def build_class(self):
-        """
-        Finalize class based on the accumulated configuration.
-
-        Builder cannot be used after calling this method.
-        """
-        if self._slots is True:
-            return self._create_slots_class()
-        else:
-            return self._patch_original_class()
-
-    def _patch_original_class(self):
-        """
-        Apply accumulated methods and return the class.
-        """
-        cls = self._cls
-        base_names = self._base_names
-
-        # Clean class of attribute definitions (`attr.ib()`s).
-        if self._delete_attribs:
-            for name in self._attr_names:
-                if (
-                    name not in base_names
-                    and getattr(cls, name, _sentinel) is not _sentinel
-                ):
-                    try:
-                        delattr(cls, name)
-                    except AttributeError:
-                        # This can happen if a base class defines a class
-                        # variable and we want to set an attribute with the
-                        # same name by using only a type annotation.
-                        pass
-
-        # Attach our dunder methods.
-        for name, value in self._cls_dict.items():
-            setattr(cls, name, value)
-
-        # If we've inherited an attrs __setattr__ and don't write our own,
-        # reset it to object's.
-        if not self._has_own_setattr and getattr(
-            cls, "__attrs_own_setattr__", False
-        ):
-            cls.__attrs_own_setattr__ = False
-
-            if not self._has_custom_setattr:
-                cls.__setattr__ = object.__setattr__
-
-        return cls
-
-    def _create_slots_class(self):
-        """
-        Build and return a new class with a `__slots__` attribute.
-        """
-        cd = {
-            k: v
-            for k, v in iteritems(self._cls_dict)
-            if k not in tuple(self._attr_names) + ("__dict__", "__weakref__")
-        }
-
-        # If our class doesn't have its own implementation of __setattr__
-        # (either from the user or by us), check the bases, if one of them has
-        # an attrs-made __setattr__, that needs to be reset. We don't walk the
-        # MRO because we only care about our immediate base classes.
-        # XXX: This can be confused by subclassing a slotted attrs class with
-        # XXX: a non-attrs class and subclass the resulting class with an attrs
-        # XXX: class.  See `test_slotted_confused` for details.  For now that's
-        # XXX: OK with us.
-        if not self._has_own_setattr:
-            cd["__attrs_own_setattr__"] = False
-
-            if not self._has_custom_setattr:
-                for base_cls in self._cls.__bases__:
-                    if base_cls.__dict__.get("__attrs_own_setattr__", False):
-                        cd["__setattr__"] = object.__setattr__
-                        break
-
-        # Traverse the MRO to collect existing slots
-        # and check for an existing __weakref__.
-        existing_slots = dict()
-        weakref_inherited = False
-        for base_cls in self._cls.__mro__[1:-1]:
-            if base_cls.__dict__.get("__weakref__", None) is not None:
-                weakref_inherited = True
-            existing_slots.update(
-                {
-                    name: getattr(base_cls, name)
-                    for name in getattr(base_cls, "__slots__", [])
-                }
-            )
-
-        base_names = set(self._base_names)
-
-        names = self._attr_names
-        if (
-            self._weakref_slot
-            and "__weakref__" not in getattr(self._cls, "__slots__", ())
-            and "__weakref__" not in names
-            and not weakref_inherited
-        ):
-            names += ("__weakref__",)
-
-        # We only add the names of attributes that aren't inherited.
-        # Setting __slots__ to inherited attributes wastes memory.
-        slot_names = [name for name in names if name not in base_names]
-        # There are slots for attributes from current class
-        # that are defined in parent classes.
-        # As their descriptors may be overriden by a child class,
-        # we collect them here and update the class dict
-        reused_slots = {
-            slot: slot_descriptor
-            for slot, slot_descriptor in iteritems(existing_slots)
-            if slot in slot_names
-        }
-        slot_names = [name for name in slot_names if name not in reused_slots]
-        cd.update(reused_slots)
-        if self._cache_hash:
-            slot_names.append(_hash_cache_field)
-        cd["__slots__"] = tuple(slot_names)
-
-        qualname = getattr(self._cls, "__qualname__", None)
-        if qualname is not None:
-            cd["__qualname__"] = qualname
-
-        # Create new class based on old class and our methods.
-        cls = type(self._cls)(self._cls.__name__, self._cls.__bases__, cd)
-
-        # The following is a fix for
-        # https://github.com/python-attrs/attrs/issues/102.  On Python 3,
-        # if a method mentions `__class__` or uses the no-arg super(), the
-        # compiler will bake a reference to the class in the method itself
-        # as `method.__closure__`.  Since we replace the class with a
-        # clone, we rewrite these references so it keeps working.
-        for item in cls.__dict__.values():
-            if isinstance(item, (classmethod, staticmethod)):
-                # Class- and staticmethods hide their functions inside.
-                # These might need to be rewritten as well.
-                closure_cells = getattr(item.__func__, "__closure__", None)
-            elif isinstance(item, property):
-                # Workaround for property `super()` shortcut (PY3-only).
-                # There is no universal way for other descriptors.
-                closure_cells = getattr(item.fget, "__closure__", None)
-            else:
-                closure_cells = getattr(item, "__closure__", None)
-
-            if not closure_cells:  # Catch None or the empty list.
-                continue
-            for cell in closure_cells:
-                try:
-                    match = cell.cell_contents is self._cls
-                except ValueError:  # ValueError: Cell is empty
-                    pass
-                else:
-                    if match:
-                        set_closure_cell(cell, cls)
-
-        return cls
-
-    def add_repr(self, ns):
-        self._cls_dict["__repr__"] = self._add_method_dunders(
-            _make_repr(self._attrs, ns=ns)
-        )
-        return self
-
-    def add_str(self):
-        repr = self._cls_dict.get("__repr__")
-        if repr is None:
-            raise ValueError(
-                "__str__ can only be generated if a __repr__ exists."
-            )
-
-        def __str__(self):
-            return self.__repr__()
-
-        self._cls_dict["__str__"] = self._add_method_dunders(__str__)
-        return self
-
-    def _make_getstate_setstate(self):
-        """
-        Create custom __setstate__ and __getstate__ methods.
-        """
-        # __weakref__ is not writable.
-        state_attr_names = tuple(
-            an for an in self._attr_names if an != "__weakref__"
-        )
-
-        def slots_getstate(self):
-            """
-            Automatically created by attrs.
-            """
-            return tuple(getattr(self, name) for name in state_attr_names)
-
-        hash_caching_enabled = self._cache_hash
-
-        def slots_setstate(self, state):
-            """
-            Automatically created by attrs.
-            """
-            __bound_setattr = _obj_setattr.__get__(self, Attribute)
-            for name, value in zip(state_attr_names, state):
-                __bound_setattr(name, value)
-
-            # The hash code cache is not included when the object is
-            # serialized, but it still needs to be initialized to None to
-            # indicate that the first call to __hash__ should be a cache
-            # miss.
-            if hash_caching_enabled:
-                __bound_setattr(_hash_cache_field, None)
-
-        return slots_getstate, slots_setstate
-
-    def make_unhashable(self):
-        self._cls_dict["__hash__"] = None
-        return self
-
-    def add_hash(self):
-        self._cls_dict["__hash__"] = self._add_method_dunders(
-            _make_hash(
-                self._cls,
-                self._attrs,
-                frozen=self._frozen,
-                cache_hash=self._cache_hash,
-            )
-        )
-
-        return self
-
-    def add_init(self):
-        self._cls_dict["__init__"] = self._add_method_dunders(
-            _make_init(
-                self._cls,
-                self._attrs,
-                self._has_pre_init,
-                self._has_post_init,
-                self._frozen,
-                self._slots,
-                self._cache_hash,
-                self._base_attr_map,
-                self._is_exc,
-                self._on_setattr is not None
-                and self._on_setattr is not setters.NO_OP,
-                attrs_init=False,
-            )
-        )
-
-        return self
-
-    def add_attrs_init(self):
-        self._cls_dict["__attrs_init__"] = self._add_method_dunders(
-            _make_init(
-                self._cls,
-                self._attrs,
-                self._has_pre_init,
-                self._has_post_init,
-                self._frozen,
-                self._slots,
-                self._cache_hash,
-                self._base_attr_map,
-                self._is_exc,
-                self._on_setattr is not None
-                and self._on_setattr is not setters.NO_OP,
-                attrs_init=True,
-            )
-        )
-
-        return self
-
-    def add_eq(self):
-        cd = self._cls_dict
-
-        cd["__eq__"] = self._add_method_dunders(
-            _make_eq(self._cls, self._attrs)
-        )
-        cd["__ne__"] = self._add_method_dunders(_make_ne())
-
-        return self
-
-    def add_order(self):
-        cd = self._cls_dict
-
-        cd["__lt__"], cd["__le__"], cd["__gt__"], cd["__ge__"] = (
-            self._add_method_dunders(meth)
-            for meth in _make_order(self._cls, self._attrs)
-        )
-
-        return self
-
-    def add_setattr(self):
-        if self._frozen:
-            return self
-
-        sa_attrs = {}
-        for a in self._attrs:
-            on_setattr = a.on_setattr or self._on_setattr
-            if on_setattr and on_setattr is not setters.NO_OP:
-                sa_attrs[a.name] = a, on_setattr
-
-        if not sa_attrs:
-            return self
-
-        if self._has_custom_setattr:
-            # We need to write a __setattr__ but there already is one!
-            raise ValueError(
-                "Can't combine custom __setattr__ with on_setattr hooks."
-            )
-
-        # docstring comes from _add_method_dunders
-        def __setattr__(self, name, val):
-            try:
-                a, hook = sa_attrs[name]
-            except KeyError:
-                nval = val
-            else:
-                nval = hook(self, a, val)
-
-            _obj_setattr(self, name, nval)
-
-        self._cls_dict["__attrs_own_setattr__"] = True
-        self._cls_dict["__setattr__"] = self._add_method_dunders(__setattr__)
-        self._has_own_setattr = True
-
-        return self
-
-    def _add_method_dunders(self, method):
-        """
-        Add __module__ and __qualname__ to a *method* if possible.
-        """
-        try:
-            method.__module__ = self._cls.__module__
-        except AttributeError:
-            pass
-
-        try:
-            method.__qualname__ = ".".join(
-                (self._cls.__qualname__, method.__name__)
-            )
-        except AttributeError:
-            pass
-
-        try:
-            method.__doc__ = "Method generated by attrs for class %s." % (
-                self._cls.__qualname__,
-            )
-        except AttributeError:
-            pass
-
-        return method
-
-
-_CMP_DEPRECATION = (
-    "The usage of `cmp` is deprecated and will be removed on or after "
-    "2021-06-01.  Please use `eq` and `order` instead."
-)
-
-
-def _determine_attrs_eq_order(cmp, eq, order, default_eq):
-    """
-    Validate the combination of *cmp*, *eq*, and *order*. Derive the effective
-    values of eq and order.  If *eq* is None, set it to *default_eq*.
-    """
-    if cmp is not None and any((eq is not None, order is not None)):
-        raise ValueError("Don't mix `cmp` with `eq' and `order`.")
-
-    # cmp takes precedence due to bw-compatibility.
-    if cmp is not None:
-        return cmp, cmp
-
-    # If left None, equality is set to the specified default and ordering
-    # mirrors equality.
-    if eq is None:
-        eq = default_eq
-
-    if order is None:
-        order = eq
-
-    if eq is False and order is True:
-        raise ValueError("`order` can only be True if `eq` is True too.")
-
-    return eq, order
-
-
-def _determine_attrib_eq_order(cmp, eq, order, default_eq):
-    """
-    Validate the combination of *cmp*, *eq*, and *order*. Derive the effective
-    values of eq and order.  If *eq* is None, set it to *default_eq*.
-    """
-    if cmp is not None and any((eq is not None, order is not None)):
-        raise ValueError("Don't mix `cmp` with `eq' and `order`.")
-
-    def decide_callable_or_boolean(value):
-        """
-        Decide whether a key function is used.
-        """
-        if callable(value):
-            value, key = True, value
-        else:
-            key = None
-        return value, key
-
-    # cmp takes precedence due to bw-compatibility.
-    if cmp is not None:
-        cmp, cmp_key = decide_callable_or_boolean(cmp)
-        return cmp, cmp_key, cmp, cmp_key
-
-    # If left None, equality is set to the specified default and ordering
-    # mirrors equality.
-    if eq is None:
-        eq, eq_key = default_eq, None
-    else:
-        eq, eq_key = decide_callable_or_boolean(eq)
-
-    if order is None:
-        order, order_key = eq, eq_key
-    else:
-        order, order_key = decide_callable_or_boolean(order)
-
-    if eq is False and order is True:
-        raise ValueError("`order` can only be True if `eq` is True too.")
-
-    return eq, eq_key, order, order_key
-
-
-def _determine_whether_to_implement(
-    cls, flag, auto_detect, dunders, default=True
-):
-    """
-    Check whether we should implement a set of methods for *cls*.
-
-    *flag* is the argument passed into @attr.s like 'init', *auto_detect* the
-    same as passed into @attr.s and *dunders* is a tuple of attribute names
-    whose presence signal that the user has implemented it themselves.
-
-    Return *default* if no reason for either for or against is found.
-
-    auto_detect must be False on Python 2.
-    """
-    if flag is True or flag is False:
-        return flag
-
-    if flag is None and auto_detect is False:
-        return default
-
-    # Logically, flag is None and auto_detect is True here.
-    for dunder in dunders:
-        if _has_own_attribute(cls, dunder):
-            return False
-
-    return default
-
-
-def attrs(
-    maybe_cls=None,
-    these=None,
-    repr_ns=None,
-    repr=None,
-    cmp=None,
-    hash=None,
-    init=None,
-    slots=False,
-    frozen=False,
-    weakref_slot=True,
-    str=False,
-    auto_attribs=False,
-    kw_only=False,
-    cache_hash=False,
-    auto_exc=False,
-    eq=None,
-    order=None,
-    auto_detect=False,
-    collect_by_mro=False,
-    getstate_setstate=None,
-    on_setattr=None,
-    field_transformer=None,
-):
-    r"""
-    A class decorator that adds `dunder
-    <https://wiki.python.org/moin/DunderAlias>`_\ -methods according to the
-    specified attributes using `attr.ib` or the *these* argument.
-
-    :param these: A dictionary of name to `attr.ib` mappings.  This is
-        useful to avoid the definition of your attributes within the class body
-        because you can't (e.g. if you want to add ``__repr__`` methods to
-        Django models) or don't want to.
-
-        If *these* is not ``None``, ``attrs`` will *not* search the class body
-        for attributes and will *not* remove any attributes from it.
-
-        If *these* is an ordered dict (`dict` on Python 3.6+,
-        `collections.OrderedDict` otherwise), the order is deduced from
-        the order of the attributes inside *these*.  Otherwise the order
-        of the definition of the attributes is used.
-
-    :type these: `dict` of `str` to `attr.ib`
-
-    :param str repr_ns: When using nested classes, there's no way in Python 2
-        to automatically detect that.  Therefore it's possible to set the
-        namespace explicitly for a more meaningful ``repr`` output.
-    :param bool auto_detect: Instead of setting the *init*, *repr*, *eq*,
-        *order*, and *hash* arguments explicitly, assume they are set to
-        ``True`` **unless any** of the involved methods for one of the
-        arguments is implemented in the *current* class (i.e. it is *not*
-        inherited from some base class).
-
-        So for example by implementing ``__eq__`` on a class yourself,
-        ``attrs`` will deduce ``eq=False`` and will create *neither*
-        ``__eq__`` *nor* ``__ne__`` (but Python classes come with a sensible
-        ``__ne__`` by default, so it *should* be enough to only implement
-        ``__eq__`` in most cases).
-
-        .. warning::
-
-           If you prevent ``attrs`` from creating the ordering methods for you
-           (``order=False``, e.g. by implementing ``__le__``), it becomes
-           *your* responsibility to make sure its ordering is sound. The best
-           way is to use the `functools.total_ordering` decorator.
-
-
-        Passing ``True`` or ``False`` to *init*, *repr*, *eq*, *order*,
-        *cmp*, or *hash* overrides whatever *auto_detect* would determine.
-
-        *auto_detect* requires Python 3. Setting it ``True`` on Python 2 raises
-        a `PythonTooOldError`.
-
-    :param bool repr: Create a ``__repr__`` method with a human readable
-        representation of ``attrs`` attributes..
-    :param bool str: Create a ``__str__`` method that is identical to
-        ``__repr__``.  This is usually not necessary except for
-        `Exception`\ s.
-    :param Optional[bool] eq: If ``True`` or ``None`` (default), add ``__eq__``
-        and ``__ne__`` methods that check two instances for equality.
-
-        They compare the instances as if they were tuples of their ``attrs``
-        attributes if and only if the types of both classes are *identical*!
-    :param Optional[bool] order: If ``True``, add ``__lt__``, ``__le__``,
-        ``__gt__``, and ``__ge__`` methods that behave like *eq* above and
-        allow instances to be ordered. If ``None`` (default) mirror value of
-        *eq*.
-    :param Optional[bool] cmp: Setting *cmp* is equivalent to setting *eq*
-        and *order* to the same value. Must not be mixed with *eq* or *order*.
-    :param Optional[bool] hash: If ``None`` (default), the ``__hash__`` method
-        is generated according how *eq* and *frozen* are set.
-
-        1. If *both* are True, ``attrs`` will generate a ``__hash__`` for you.
-        2. If *eq* is True and *frozen* is False, ``__hash__`` will be set to
-           None, marking it unhashable (which it is).
-        3. If *eq* is False, ``__hash__`` will be left untouched meaning the
-           ``__hash__`` method of the base class will be used (if base class is
-           ``object``, this means it will fall back to id-based hashing.).
-
-        Although not recommended, you can decide for yourself and force
-        ``attrs`` to create one (e.g. if the class is immutable even though you
-        didn't freeze it programmatically) by passing ``True`` or not.  Both of
-        these cases are rather special and should be used carefully.
-
-        See our documentation on `hashing`, Python's documentation on
-        `object.__hash__`, and the `GitHub issue that led to the default \
-        behavior <https://github.com/python-attrs/attrs/issues/136>`_ for more
-        details.
-    :param bool init: Create a ``__init__`` method that initializes the
-        ``attrs`` attributes. Leading underscores are stripped for the argument
-        name. If a ``__attrs_pre_init__`` method exists on the class, it will
-        be called before the class is initialized. If a ``__attrs_post_init__``
-        method exists on the class, it will be called after the class is fully
-        initialized.
-
-        If ``init`` is ``False``, an ``__attrs_init__`` method will be
-        injected instead. This allows you to define a custom ``__init__``
-        method that can do pre-init work such as ``super().__init__()``,
-        and then call ``__attrs_init__()`` and ``__attrs_post_init__()``.
-    :param bool slots: Create a `slotted class <slotted classes>` that's more
-        memory-efficient. Slotted classes are generally superior to the default
-        dict classes, but have some gotchas you should know about, so we
-        encourage you to read the `glossary entry <slotted classes>`.
-    :param bool frozen: Make instances immutable after initialization.  If
-        someone attempts to modify a frozen instance,
-        `attr.exceptions.FrozenInstanceError` is raised.
-
-        .. note::
-
-            1. This is achieved by installing a custom ``__setattr__`` method
-               on your class, so you can't implement your own.
-
-            2. True immutability is impossible in Python.
-
-            3. This *does* have a minor a runtime performance `impact
-               <how-frozen>` when initializing new instances.  In other words:
-               ``__init__`` is slightly slower with ``frozen=True``.
-
-            4. If a class is frozen, you cannot modify ``self`` in
-               ``__attrs_post_init__`` or a self-written ``__init__``. You can
-               circumvent that limitation by using
-               ``object.__setattr__(self, "attribute_name", value)``.
-
-            5. Subclasses of a frozen class are frozen too.
-
-    :param bool weakref_slot: Make instances weak-referenceable.  This has no
-        effect unless ``slots`` is also enabled.
-    :param bool auto_attribs: If ``True``, collect `PEP 526`_-annotated
-        attributes (Python 3.6 and later only) from the class body.
-
-        In this case, you **must** annotate every field.  If ``attrs``
-        encounters a field that is set to an `attr.ib` but lacks a type
-        annotation, an `attr.exceptions.UnannotatedAttributeError` is
-        raised.  Use ``field_name: typing.Any = attr.ib(...)`` if you don't
-        want to set a type.
-
-        If you assign a value to those attributes (e.g. ``x: int = 42``), that
-        value becomes the default value like if it were passed using
-        ``attr.ib(default=42)``.  Passing an instance of `Factory` also
-        works as expected in most cases (see warning below).
-
-        Attributes annotated as `typing.ClassVar`, and attributes that are
-        neither annotated nor set to an `attr.ib` are **ignored**.
-
-        .. warning::
-           For features that use the attribute name to create decorators (e.g.
-           `validators <validators>`), you still *must* assign `attr.ib` to
-           them. Otherwise Python will either not find the name or try to use
-           the default value to call e.g. ``validator`` on it.
-
-           These errors can be quite confusing and probably the most common bug
-           report on our bug tracker.
-
-        .. _`PEP 526`: https://www.python.org/dev/peps/pep-0526/
-    :param bool kw_only: Make all attributes keyword-only (Python 3+)
-        in the generated ``__init__`` (if ``init`` is ``False``, this
-        parameter is ignored).
-    :param bool cache_hash: Ensure that the object's hash code is computed
-        only once and stored on the object.  If this is set to ``True``,
-        hashing must be either explicitly or implicitly enabled for this
-        class.  If the hash code is cached, avoid any reassignments of
-        fields involved in hash code computation or mutations of the objects
-        those fields point to after object creation.  If such changes occur,
-        the behavior of the object's hash code is undefined.
-    :param bool auto_exc: If the class subclasses `BaseException`
-        (which implicitly includes any subclass of any exception), the
-        following happens to behave like a well-behaved Python exceptions
-        class:
-
-        - the values for *eq*, *order*, and *hash* are ignored and the
-          instances compare and hash by the instance's ids (N.B. ``attrs`` will
-          *not* remove existing implementations of ``__hash__`` or the equality
-          methods. It just won't add own ones.),
-        - all attributes that are either passed into ``__init__`` or have a
-          default value are additionally available as a tuple in the ``args``
-          attribute,
-        - the value of *str* is ignored leaving ``__str__`` to base classes.
-    :param bool collect_by_mro: Setting this to `True` fixes the way ``attrs``
-       collects attributes from base classes.  The default behavior is
-       incorrect in certain cases of multiple inheritance.  It should be on by
-       default but is kept off for backward-compatability.
-
-       See issue `#428 <https://github.com/python-attrs/attrs/issues/428>`_ for
-       more details.
-
-    :param Optional[bool] getstate_setstate:
-       .. note::
-          This is usually only interesting for slotted classes and you should
-          probably just set *auto_detect* to `True`.
-
-       If `True`, ``__getstate__`` and
-       ``__setstate__`` are generated and attached to the class. This is
-       necessary for slotted classes to be pickleable. If left `None`, it's
-       `True` by default for slotted classes and ``False`` for dict classes.
-
-       If *auto_detect* is `True`, and *getstate_setstate* is left `None`,
-       and **either** ``__getstate__`` or ``__setstate__`` is detected directly
-       on the class (i.e. not inherited), it is set to `False` (this is usually
-       what you want).
-
-    :param on_setattr: A callable that is run whenever the user attempts to set
-        an attribute (either by assignment like ``i.x = 42`` or by using
-        `setattr` like ``setattr(i, "x", 42)``). It receives the same arguments
-        as validators: the instance, the attribute that is being modified, and
-        the new value.
-
-        If no exception is raised, the attribute is set to the return value of
-        the callable.
-
-        If a list of callables is passed, they're automatically wrapped in an
-        `attr.setters.pipe`.
-
-    :param Optional[callable] field_transformer:
-        A function that is called with the original class object and all
-        fields right before ``attrs`` finalizes the class.  You can use
-        this, e.g., to automatically add converters or validators to
-        fields based on their types.  See `transform-fields` for more details.
-
-    .. versionadded:: 16.0.0 *slots*
-    .. versionadded:: 16.1.0 *frozen*
-    .. versionadded:: 16.3.0 *str*
-    .. versionadded:: 16.3.0 Support for ``__attrs_post_init__``.
-    .. versionchanged:: 17.1.0
-       *hash* supports ``None`` as value which is also the default now.
-    .. versionadded:: 17.3.0 *auto_attribs*
-    .. versionchanged:: 18.1.0
-       If *these* is passed, no attributes are deleted from the class body.
-    .. versionchanged:: 18.1.0 If *these* is ordered, the order is retained.
-    .. versionadded:: 18.2.0 *weakref_slot*
-    .. deprecated:: 18.2.0
-       ``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` now raise a
-       `DeprecationWarning` if the classes compared are subclasses of
-       each other. ``__eq`` and ``__ne__`` never tried to compared subclasses
-       to each other.
-    .. versionchanged:: 19.2.0
-       ``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` now do not consider
-       subclasses comparable anymore.
-    .. versionadded:: 18.2.0 *kw_only*
-    .. versionadded:: 18.2.0 *cache_hash*
-    .. versionadded:: 19.1.0 *auto_exc*
-    .. deprecated:: 19.2.0 *cmp* Removal on or after 2021-06-01.
-    .. versionadded:: 19.2.0 *eq* and *order*
-    .. versionadded:: 20.1.0 *auto_detect*
-    .. versionadded:: 20.1.0 *collect_by_mro*
-    .. versionadded:: 20.1.0 *getstate_setstate*
-    .. versionadded:: 20.1.0 *on_setattr*
-    .. versionadded:: 20.3.0 *field_transformer*
-    .. versionchanged:: 21.1.0
-       ``init=False`` injects ``__attrs_init__``
-    .. versionchanged:: 21.1.0 Support for ``__attrs_pre_init__``
-    .. versionchanged:: 21.1.0 *cmp* undeprecated
-    """
-    if auto_detect and PY2:
-        raise PythonTooOldError(
-            "auto_detect only works on Python 3 and later."
-        )
-
-    eq_, order_ = _determine_attrs_eq_order(cmp, eq, order, None)
-    hash_ = hash  # work around the lack of nonlocal
-
-    if isinstance(on_setattr, (list, tuple)):
-        on_setattr = setters.pipe(*on_setattr)
-
-    def wrap(cls):
-
-        if getattr(cls, "__class__", None) is None:
-            raise TypeError("attrs only works with new-style classes.")
-
-        is_frozen = frozen or _has_frozen_base_class(cls)
-        is_exc = auto_exc is True and issubclass(cls, BaseException)
-        has_own_setattr = auto_detect and _has_own_attribute(
-            cls, "__setattr__"
-        )
-
-        if has_own_setattr and is_frozen:
-            raise ValueError("Can't freeze a class with a custom __setattr__.")
-
-        builder = _ClassBuilder(
-            cls,
-            these,
-            slots,
-            is_frozen,
-            weakref_slot,
-            _determine_whether_to_implement(
-                cls,
-                getstate_setstate,
-                auto_detect,
-                ("__getstate__", "__setstate__"),
-                default=slots,
-            ),
-            auto_attribs,
-            kw_only,
-            cache_hash,
-            is_exc,
-            collect_by_mro,
-            on_setattr,
-            has_own_setattr,
-            field_transformer,
-        )
-        if _determine_whether_to_implement(
-            cls, repr, auto_detect, ("__repr__",)
-        ):
-            builder.add_repr(repr_ns)
-        if str is True:
-            builder.add_str()
-
-        eq = _determine_whether_to_implement(
-            cls, eq_, auto_detect, ("__eq__", "__ne__")
-        )
-        if not is_exc and eq is True:
-            builder.add_eq()
-        if not is_exc and _determine_whether_to_implement(
-            cls, order_, auto_detect, ("__lt__", "__le__", "__gt__", "__ge__")
-        ):
-            builder.add_order()
-
-        builder.add_setattr()
-
-        if (
-            hash_ is None
-            and auto_detect is True
-            and _has_own_attribute(cls, "__hash__")
-        ):
-            hash = False
-        else:
-            hash = hash_
-        if hash is not True and hash is not False and hash is not None:
-            # Can't use `hash in` because 1 == True for example.
-            raise TypeError(
-                "Invalid value for hash.  Must be True, False, or None."
-            )
-        elif hash is False or (hash is None and eq is False) or is_exc:
-            # Don't do anything. Should fall back to __object__'s __hash__
-            # which is by id.
-            if cache_hash:
-                raise TypeError(
-                    "Invalid value for cache_hash.  To use hash caching,"
-                    " hashing must be either explicitly or implicitly "
-                    "enabled."
-                )
-        elif hash is True or (
-            hash is None and eq is True and is_frozen is True
-        ):
-            # Build a __hash__ if told so, or if it's safe.
-            builder.add_hash()
-        else:
-            # Raise TypeError on attempts to hash.
-            if cache_hash:
-                raise TypeError(
-                    "Invalid value for cache_hash.  To use hash caching,"
-                    " hashing must be either explicitly or implicitly "
-                    "enabled."
-                )
-            builder.make_unhashable()
-
-        if _determine_whether_to_implement(
-            cls, init, auto_detect, ("__init__",)
-        ):
-            builder.add_init()
-        else:
-            builder.add_attrs_init()
-            if cache_hash:
-                raise TypeError(
-                    "Invalid value for cache_hash.  To use hash caching,"
-                    " init must be True."
-                )
-
-        return builder.build_class()
-
-    # maybe_cls's type depends on the usage of the decorator.  It's a class
-    # if it's used as `@attrs` but ``None`` if used as `@attrs()`.
-    if maybe_cls is None:
-        return wrap
-    else:
-        return wrap(maybe_cls)
-
-
-_attrs = attrs
-"""
-Internal alias so we can use it in functions that take an argument called
-*attrs*.
-"""
-
-
-if PY2:
-
-    def _has_frozen_base_class(cls):
-        """
-        Check whether *cls* has a frozen ancestor by looking at its
-        __setattr__.
-        """
-        return (
-            getattr(cls.__setattr__, "__module__", None)
-            == _frozen_setattrs.__module__
-            and cls.__setattr__.__name__ == _frozen_setattrs.__name__
-        )
-
-
-else:
-
-    def _has_frozen_base_class(cls):
-        """
-        Check whether *cls* has a frozen ancestor by looking at its
-        __setattr__.
-        """
-        return cls.__setattr__ == _frozen_setattrs
-
-
-def _generate_unique_filename(cls, func_name):
-    """
-    Create a "filename" suitable for a function being generated.
-    """
-    unique_id = uuid.uuid4()
-    extra = ""
-    count = 1
-
-    while True:
-        unique_filename = "<attrs generated {0} {1}.{2}{3}>".format(
-            func_name,
-            cls.__module__,
-            getattr(cls, "__qualname__", cls.__name__),
-            extra,
-        )
-        # To handle concurrency we essentially "reserve" our spot in
-        # the linecache with a dummy line.  The caller can then
-        # set this value correctly.
-        cache_line = (1, None, (str(unique_id),), unique_filename)
-        if (
-            linecache.cache.setdefault(unique_filename, cache_line)
-            == cache_line
-        ):
-            return unique_filename
-
-        # Looks like this spot is taken. Try again.
-        count += 1
-        extra = "-{0}".format(count)
-
-
-def _make_hash(cls, attrs, frozen, cache_hash):
-    attrs = tuple(
-        a for a in attrs if a.hash is True or (a.hash is None and a.eq is True)
-    )
-
-    tab = "        "
-
-    unique_filename = _generate_unique_filename(cls, "hash")
-    type_hash = hash(unique_filename)
-
-    hash_def = "def __hash__(self"
-    hash_func = "hash(("
-    closing_braces = "))"
-    if not cache_hash:
-        hash_def += "):"
-    else:
-        if not PY2:
-            hash_def += ", *"
-
-        hash_def += (
-            ", _cache_wrapper="
-            + "__import__('attr._make')._make._CacheHashWrapper):"
-        )
-        hash_func = "_cache_wrapper(" + hash_func
-        closing_braces += ")"
-
-    method_lines = [hash_def]
-
-    def append_hash_computation_lines(prefix, indent):
-        """
-        Generate the code for actually computing the hash code.
-        Below this will either be returned directly or used to compute
-        a value which is then cached, depending on the value of cache_hash
-        """
-
-        method_lines.extend(
-            [
-                indent + prefix + hash_func,
-                indent + "        %d," % (type_hash,),
-            ]
-        )
-
-        for a in attrs:
-            method_lines.append(indent + "        self.%s," % a.name)
-
-        method_lines.append(indent + "    " + closing_braces)
-
-    if cache_hash:
-        method_lines.append(tab + "if self.%s is None:" % _hash_cache_field)
-        if frozen:
-            append_hash_computation_lines(
-                "object.__setattr__(self, '%s', " % _hash_cache_field, tab * 2
-            )
-            method_lines.append(tab * 2 + ")")  # close __setattr__
-        else:
-            append_hash_computation_lines(
-                "self.%s = " % _hash_cache_field, tab * 2
-            )
-        method_lines.append(tab + "return self.%s" % _hash_cache_field)
-    else:
-        append_hash_computation_lines("return ", tab)
-
-    script = "\n".join(method_lines)
-    return _make_method("__hash__", script, unique_filename)
-
-
-def _add_hash(cls, attrs):
-    """
-    Add a hash method to *cls*.
-    """
-    cls.__hash__ = _make_hash(cls, attrs, frozen=False, cache_hash=False)
-    return cls
-
-
-def _make_ne():
-    """
-    Create __ne__ method.
-    """
-
-    def __ne__(self, other):
-        """
-        Check equality and either forward a NotImplemented or
-        return the result negated.
-        """
-        result = self.__eq__(other)
-        if result is NotImplemented:
-            return NotImplemented
-
-        return not result
-
-    return __ne__
-
-
-def _make_eq(cls, attrs):
-    """
-    Create __eq__ method for *cls* with *attrs*.
-    """
-    attrs = [a for a in attrs if a.eq]
-
-    unique_filename = _generate_unique_filename(cls, "eq")
-    lines = [
-        "def __eq__(self, other):",
-        "    if other.__class__ is not self.__class__:",
-        "        return NotImplemented",
-    ]
-
-    # We can't just do a big self.x = other.x and... clause due to
-    # irregularities like nan == nan is false but (nan,) == (nan,) is true.
-    globs = {}
-    if attrs:
-        lines.append("    return  (")
-        others = ["    ) == ("]
-        for a in attrs:
-            if a.eq_key:
-                cmp_name = "_%s_key" % (a.name,)
-                # Add the key function to the global namespace
-                # of the evaluated function.
-                globs[cmp_name] = a.eq_key
-                lines.append(
-                    "        %s(self.%s),"
-                    % (
-                        cmp_name,
-                        a.name,
-                    )
-                )
-                others.append(
-                    "        %s(other.%s),"
-                    % (
-                        cmp_name,
-                        a.name,
-                    )
-                )
-            else:
-                lines.append("        self.%s," % (a.name,))
-                others.append("        other.%s," % (a.name,))
-
-        lines += others + ["    )"]
-    else:
-        lines.append("    return True")
-
-    script = "\n".join(lines)
-
-    return _make_method("__eq__", script, unique_filename, globs)
-
-
-def _make_order(cls, attrs):
-    """
-    Create ordering methods for *cls* with *attrs*.
-    """
-    attrs = [a for a in attrs if a.order]
-
-    def attrs_to_tuple(obj):
-        """
-        Save us some typing.
-        """
-        return tuple(
-            key(value) if key else value
-            for value, key in (
-                (getattr(obj, a.name), a.order_key) for a in attrs
-            )
-        )
-
-    def __lt__(self, other):
-        """
-        Automatically created by attrs.
-        """
-        if other.__class__ is self.__class__:
-            return attrs_to_tuple(self) < attrs_to_tuple(other)
-
-        return NotImplemented
-
-    def __le__(self, other):
-        """
-        Automatically created by attrs.
-        """
-        if other.__class__ is self.__class__:
-            return attrs_to_tuple(self) <= attrs_to_tuple(other)
-
-        return NotImplemented
-
-    def __gt__(self, other):
-        """
-        Automatically created by attrs.
-        """
-        if other.__class__ is self.__class__:
-            return attrs_to_tuple(self) > attrs_to_tuple(other)
-
-        return NotImplemented
-
-    def __ge__(self, other):
-        """
-        Automatically created by attrs.
-        """
-        if other.__class__ is self.__class__:
-            return attrs_to_tuple(self) >= attrs_to_tuple(other)
-
-        return NotImplemented
-
-    return __lt__, __le__, __gt__, __ge__
-
-
-def _add_eq(cls, attrs=None):
-    """
-    Add equality methods to *cls* with *attrs*.
-    """
-    if attrs is None:
-        attrs = cls.__attrs_attrs__
-
-    cls.__eq__ = _make_eq(cls, attrs)
-    cls.__ne__ = _make_ne()
-
-    return cls
-
-
-_already_repring = threading.local()
-
-
-def _make_repr(attrs, ns):
-    """
-    Make a repr method that includes relevant *attrs*, adding *ns* to the full
-    name.
-    """
-
-    # Figure out which attributes to include, and which function to use to
-    # format them. The a.repr value can be either bool or a custom callable.
-    attr_names_with_reprs = tuple(
-        (a.name, repr if a.repr is True else a.repr)
-        for a in attrs
-        if a.repr is not False
-    )
-
-    def __repr__(self):
-        """
-        Automatically created by attrs.
-        """
-        try:
-            working_set = _already_repring.working_set
-        except AttributeError:
-            working_set = set()
-            _already_repring.working_set = working_set
-
-        if id(self) in working_set:
-            return "..."
-        real_cls = self.__class__
-        if ns is None:
-            qualname = getattr(real_cls, "__qualname__", None)
-            if qualname is not None:
-                class_name = qualname.rsplit(">.", 1)[-1]
-            else:
-                class_name = real_cls.__name__
-        else:
-            class_name = ns + "." + real_cls.__name__
-
-        # Since 'self' remains on the stack (i.e.: strongly referenced) for the
-        # duration of this call, it's safe to depend on id(...) stability, and
-        # not need to track the instance and therefore worry about properties
-        # like weakref- or hash-ability.
-        working_set.add(id(self))
-        try:
-            result = [class_name, "("]
-            first = True
-            for name, attr_repr in attr_names_with_reprs:
-                if first:
-                    first = False
-                else:
-                    result.append(", ")
-                result.extend(
-                    (name, "=", attr_repr(getattr(self, name, NOTHING)))
-                )
-            return "".join(result) + ")"
-        finally:
-            working_set.remove(id(self))
-
-    return __repr__
-
-
-def _add_repr(cls, ns=None, attrs=None):
-    """
-    Add a repr method to *cls*.
-    """
-    if attrs is None:
-        attrs = cls.__attrs_attrs__
-
-    cls.__repr__ = _make_repr(attrs, ns)
-    return cls
-
-
-def fields(cls):
-    """
-    Return the tuple of ``attrs`` attributes for a class.
-
-    The tuple also allows accessing the fields by their names (see below for
-    examples).
-
-    :param type cls: Class to introspect.
-
-    :raise TypeError: If *cls* is not a class.
-    :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs``
-        class.
-
-    :rtype: tuple (with name accessors) of `attr.Attribute`
-
-    ..  versionchanged:: 16.2.0 Returned tuple allows accessing the fields
-        by name.
-    """
-    if not isclass(cls):
-        raise TypeError("Passed object must be a class.")
-    attrs = getattr(cls, "__attrs_attrs__", None)
-    if attrs is None:
-        raise NotAnAttrsClassError(
-            "{cls!r} is not an attrs-decorated class.".format(cls=cls)
-        )
-    return attrs
-
-
-def fields_dict(cls):
-    """
-    Return an ordered dictionary of ``attrs`` attributes for a class, whose
-    keys are the attribute names.
-
-    :param type cls: Class to introspect.
-
-    :raise TypeError: If *cls* is not a class.
-    :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs``
-        class.
-
-    :rtype: an ordered dict where keys are attribute names and values are
-        `attr.Attribute`\\ s. This will be a `dict` if it's
-        naturally ordered like on Python 3.6+ or an
-        :class:`~collections.OrderedDict` otherwise.
-
-    .. versionadded:: 18.1.0
-    """
-    if not isclass(cls):
-        raise TypeError("Passed object must be a class.")
-    attrs = getattr(cls, "__attrs_attrs__", None)
-    if attrs is None:
-        raise NotAnAttrsClassError(
-            "{cls!r} is not an attrs-decorated class.".format(cls=cls)
-        )
-    return ordered_dict(((a.name, a) for a in attrs))
-
-
-def validate(inst):
-    """
-    Validate all attributes on *inst* that have a validator.
-
-    Leaves all exceptions through.
-
-    :param inst: Instance of a class with ``attrs`` attributes.
-    """
-    if _config._run_validators is False:
-        return
-
-    for a in fields(inst.__class__):
-        v = a.validator
-        if v is not None:
-            v(inst, a, getattr(inst, a.name))
-
-
-def _is_slot_cls(cls):
-    return "__slots__" in cls.__dict__
-
-
-def _is_slot_attr(a_name, base_attr_map):
-    """
-    Check if the attribute name comes from a slot class.
-    """
-    return a_name in base_attr_map and _is_slot_cls(base_attr_map[a_name])
-
-
-def _make_init(
-    cls,
-    attrs,
-    pre_init,
-    post_init,
-    frozen,
-    slots,
-    cache_hash,
-    base_attr_map,
-    is_exc,
-    has_global_on_setattr,
-    attrs_init,
-):
-    if frozen and has_global_on_setattr:
-        raise ValueError("Frozen classes can't use on_setattr.")
-
-    needs_cached_setattr = cache_hash or frozen
-    filtered_attrs = []
-    attr_dict = {}
-    for a in attrs:
-        if not a.init and a.default is NOTHING:
-            continue
-
-        filtered_attrs.append(a)
-        attr_dict[a.name] = a
-
-        if a.on_setattr is not None:
-            if frozen is True:
-                raise ValueError("Frozen classes can't use on_setattr.")
-
-            needs_cached_setattr = True
-        elif (
-            has_global_on_setattr and a.on_setattr is not setters.NO_OP
-        ) or _is_slot_attr(a.name, base_attr_map):
-            needs_cached_setattr = True
-
-    unique_filename = _generate_unique_filename(cls, "init")
-
-    script, globs, annotations = _attrs_to_init_script(
-        filtered_attrs,
-        frozen,
-        slots,
-        pre_init,
-        post_init,
-        cache_hash,
-        base_attr_map,
-        is_exc,
-        needs_cached_setattr,
-        has_global_on_setattr,
-        attrs_init,
-    )
-    if cls.__module__ in sys.modules:
-        # This makes typing.get_type_hints(CLS.__init__) resolve string types.
-        globs.update(sys.modules[cls.__module__].__dict__)
-
-    globs.update({"NOTHING": NOTHING, "attr_dict": attr_dict})
-
-    if needs_cached_setattr:
-        # Save the lookup overhead in __init__ if we need to circumvent
-        # setattr hooks.
-        globs["_cached_setattr"] = _obj_setattr
-
-    init = _make_method(
-        "__attrs_init__" if attrs_init else "__init__",
-        script,
-        unique_filename,
-        globs,
-    )
-    init.__annotations__ = annotations
-
-    return init
-
-
-def _setattr(attr_name, value_var, has_on_setattr):
-    """
-    Use the cached object.setattr to set *attr_name* to *value_var*.
-    """
-    return "_setattr('%s', %s)" % (attr_name, value_var)
-
-
-def _setattr_with_converter(attr_name, value_var, has_on_setattr):
-    """
-    Use the cached object.setattr to set *attr_name* to *value_var*, but run
-    its converter first.
-    """
-    return "_setattr('%s', %s(%s))" % (
-        attr_name,
-        _init_converter_pat % (attr_name,),
-        value_var,
-    )
-
-
-def _assign(attr_name, value, has_on_setattr):
-    """
-    Unless *attr_name* has an on_setattr hook, use normal assignment. Otherwise
-    relegate to _setattr.
-    """
-    if has_on_setattr:
-        return _setattr(attr_name, value, True)
-
-    return "self.%s = %s" % (attr_name, value)
-
-
-def _assign_with_converter(attr_name, value_var, has_on_setattr):
-    """
-    Unless *attr_name* has an on_setattr hook, use normal assignment after
-    conversion. Otherwise relegate to _setattr_with_converter.
-    """
-    if has_on_setattr:
-        return _setattr_with_converter(attr_name, value_var, True)
-
-    return "self.%s = %s(%s)" % (
-        attr_name,
-        _init_converter_pat % (attr_name,),
-        value_var,
-    )
-
-
-if PY2:
-
-    def _unpack_kw_only_py2(attr_name, default=None):
-        """
-        Unpack *attr_name* from _kw_only dict.
-        """
-        if default is not None:
-            arg_default = ", %s" % default
-        else:
-            arg_default = ""
-        return "%s = _kw_only.pop('%s'%s)" % (
-            attr_name,
-            attr_name,
-            arg_default,
-        )
-
-    def _unpack_kw_only_lines_py2(kw_only_args):
-        """
-        Unpack all *kw_only_args* from _kw_only dict and handle errors.
-
-        Given a list of strings "{attr_name}" and "{attr_name}={default}"
-        generates list of lines of code that pop attrs from _kw_only dict and
-        raise TypeError similar to builtin if required attr is missing or
-        extra key is passed.
-
-        >>> print("\n".join(_unpack_kw_only_lines_py2(["a", "b=42"])))
-        try:
-            a = _kw_only.pop('a')
-            b = _kw_only.pop('b', 42)
-        except KeyError as _key_error:
-            raise TypeError(
-                ...
-        if _kw_only:
-            raise TypeError(
-                ...
-        """
-        lines = ["try:"]
-        lines.extend(
-            "    " + _unpack_kw_only_py2(*arg.split("="))
-            for arg in kw_only_args
-        )
-        lines += """\
-except KeyError as _key_error:
-    raise TypeError(
-        '__init__() missing required keyword-only argument: %s' % _key_error
-    )
-if _kw_only:
-    raise TypeError(
-        '__init__() got an unexpected keyword argument %r'
-        % next(iter(_kw_only))
-    )
-""".split(
-            "\n"
-        )
-        return lines
-
-
-def _attrs_to_init_script(
-    attrs,
-    frozen,
-    slots,
-    pre_init,
-    post_init,
-    cache_hash,
-    base_attr_map,
-    is_exc,
-    needs_cached_setattr,
-    has_global_on_setattr,
-    attrs_init,
-):
-    """
-    Return a script of an initializer for *attrs* and a dict of globals.
-
-    The globals are expected by the generated script.
-
-    If *frozen* is True, we cannot set the attributes directly so we use
-    a cached ``object.__setattr__``.
-    """
-    lines = []
-    if pre_init:
-        lines.append("self.__attrs_pre_init__()")
-
-    if needs_cached_setattr:
-        lines.append(
-            # Circumvent the __setattr__ descriptor to save one lookup per
-            # assignment.
-            # Note _setattr will be used again below if cache_hash is True
-            "_setattr = _cached_setattr.__get__(self, self.__class__)"
-        )
-
-    if frozen is True:
-        if slots is True:
-            fmt_setter = _setattr
-            fmt_setter_with_converter = _setattr_with_converter
-        else:
-            # Dict frozen classes assign directly to __dict__.
-            # But only if the attribute doesn't come from an ancestor slot
-            # class.
-            # Note _inst_dict will be used again below if cache_hash is True
-            lines.append("_inst_dict = self.__dict__")
-
-            def fmt_setter(attr_name, value_var, has_on_setattr):
-                if _is_slot_attr(attr_name, base_attr_map):
-                    return _setattr(attr_name, value_var, has_on_setattr)
-
-                return "_inst_dict['%s'] = %s" % (attr_name, value_var)
-
-            def fmt_setter_with_converter(
-                attr_name, value_var, has_on_setattr
-            ):
-                if has_on_setattr or _is_slot_attr(attr_name, base_attr_map):
-                    return _setattr_with_converter(
-                        attr_name, value_var, has_on_setattr
-                    )
-
-                return "_inst_dict['%s'] = %s(%s)" % (
-                    attr_name,
-                    _init_converter_pat % (attr_name,),
-                    value_var,
-                )
-
-    else:
-        # Not frozen.
-        fmt_setter = _assign
-        fmt_setter_with_converter = _assign_with_converter
-
-    args = []
-    kw_only_args = []
-    attrs_to_validate = []
-
-    # This is a dictionary of names to validator and converter callables.
-    # Injecting this into __init__ globals lets us avoid lookups.
-    names_for_globals = {}
-    annotations = {"return": None}
-
-    for a in attrs:
-        if a.validator:
-            attrs_to_validate.append(a)
-
-        attr_name = a.name
-        has_on_setattr = a.on_setattr is not None or (
-            a.on_setattr is not setters.NO_OP and has_global_on_setattr
-        )
-        arg_name = a.name.lstrip("_")
-
-        has_factory = isinstance(a.default, Factory)
-        if has_factory and a.default.takes_self:
-            maybe_self = "self"
-        else:
-            maybe_self = ""
-
-        if a.init is False:
-            if has_factory:
-                init_factory_name = _init_factory_pat.format(a.name)
-                if a.converter is not None:
-                    lines.append(
-                        fmt_setter_with_converter(
-                            attr_name,
-                            init_factory_name + "(%s)" % (maybe_self,),
-                            has_on_setattr,
-                        )
-                    )
-                    conv_name = _init_converter_pat % (a.name,)
-                    names_for_globals[conv_name] = a.converter
-                else:
-                    lines.append(
-                        fmt_setter(
-                            attr_name,
-                            init_factory_name + "(%s)" % (maybe_self,),
-                            has_on_setattr,
-                        )
-                    )
-                names_for_globals[init_factory_name] = a.default.factory
-            else:
-                if a.converter is not None:
-                    lines.append(
-                        fmt_setter_with_converter(
-                            attr_name,
-                            "attr_dict['%s'].default" % (attr_name,),
-                            has_on_setattr,
-                        )
-                    )
-                    conv_name = _init_converter_pat % (a.name,)
-                    names_for_globals[conv_name] = a.converter
-                else:
-                    lines.append(
-                        fmt_setter(
-                            attr_name,
-                            "attr_dict['%s'].default" % (attr_name,),
-                            has_on_setattr,
-                        )
-                    )
-        elif a.default is not NOTHING and not has_factory:
-            arg = "%s=attr_dict['%s'].default" % (arg_name, attr_name)
-            if a.kw_only:
-                kw_only_args.append(arg)
-            else:
-                args.append(arg)
-
-            if a.converter is not None:
-                lines.append(
-                    fmt_setter_with_converter(
-                        attr_name, arg_name, has_on_setattr
-                    )
-                )
-                names_for_globals[
-                    _init_converter_pat % (a.name,)
-                ] = a.converter
-            else:
-                lines.append(fmt_setter(attr_name, arg_name, has_on_setattr))
-
-        elif has_factory:
-            arg = "%s=NOTHING" % (arg_name,)
-            if a.kw_only:
-                kw_only_args.append(arg)
-            else:
-                args.append(arg)
-            lines.append("if %s is not NOTHING:" % (arg_name,))
-
-            init_factory_name = _init_factory_pat.format(a.name)
-            if a.converter is not None:
-                lines.append(
-                    "    "
-                    + fmt_setter_with_converter(
-                        attr_name, arg_name, has_on_setattr
-                    )
-                )
-                lines.append("else:")
-                lines.append(
-                    "    "
-                    + fmt_setter_with_converter(
-                        attr_name,
-                        init_factory_name + "(" + maybe_self + ")",
-                        has_on_setattr,
-                    )
-                )
-                names_for_globals[
-                    _init_converter_pat % (a.name,)
-                ] = a.converter
-            else:
-                lines.append(
-                    "    " + fmt_setter(attr_name, arg_name, has_on_setattr)
-                )
-                lines.append("else:")
-                lines.append(
-                    "    "
-                    + fmt_setter(
-                        attr_name,
-                        init_factory_name + "(" + maybe_self + ")",
-                        has_on_setattr,
-                    )
-                )
-            names_for_globals[init_factory_name] = a.default.factory
-        else:
-            if a.kw_only:
-                kw_only_args.append(arg_name)
-            else:
-                args.append(arg_name)
-
-            if a.converter is not None:
-                lines.append(
-                    fmt_setter_with_converter(
-                        attr_name, arg_name, has_on_setattr
-                    )
-                )
-                names_for_globals[
-                    _init_converter_pat % (a.name,)
-                ] = a.converter
-            else:
-                lines.append(fmt_setter(attr_name, arg_name, has_on_setattr))
-
-        if a.init is True:
-            if a.type is not None and a.converter is None:
-                annotations[arg_name] = a.type
-            elif a.converter is not None and not PY2:
-                # Try to get the type from the converter.
-                sig = None
-                try:
-                    sig = inspect.signature(a.converter)
-                except (ValueError, TypeError):  # inspect failed
-                    pass
-                if sig:
-                    sig_params = list(sig.parameters.values())
-                    if (
-                        sig_params
-                        and sig_params[0].annotation
-                        is not inspect.Parameter.empty
-                    ):
-                        annotations[arg_name] = sig_params[0].annotation
-
-    if attrs_to_validate:  # we can skip this if there are no validators.
-        names_for_globals["_config"] = _config
-        lines.append("if _config._run_validators is True:")
-        for a in attrs_to_validate:
-            val_name = "__attr_validator_" + a.name
-            attr_name = "__attr_" + a.name
-            lines.append(
-                "    %s(self, %s, self.%s)" % (val_name, attr_name, a.name)
-            )
-            names_for_globals[val_name] = a.validator
-            names_for_globals[attr_name] = a
-
-    if post_init:
-        lines.append("self.__attrs_post_init__()")
-
-    # because this is set only after __attrs_post_init is called, a crash
-    # will result if post-init tries to access the hash code.  This seemed
-    # preferable to setting this beforehand, in which case alteration to
-    # field values during post-init combined with post-init accessing the
-    # hash code would result in silent bugs.
-    if cache_hash:
-        if frozen:
-            if slots:
-                # if frozen and slots, then _setattr defined above
-                init_hash_cache = "_setattr('%s', %s)"
-            else:
-                # if frozen and not slots, then _inst_dict defined above
-                init_hash_cache = "_inst_dict['%s'] = %s"
-        else:
-            init_hash_cache = "self.%s = %s"
-        lines.append(init_hash_cache % (_hash_cache_field, "None"))
-
-    # For exceptions we rely on BaseException.__init__ for proper
-    # initialization.
-    if is_exc:
-        vals = ",".join("self." + a.name for a in attrs if a.init)
-
-        lines.append("BaseException.__init__(self, %s)" % (vals,))
-
-    args = ", ".join(args)
-    if kw_only_args:
-        if PY2:
-            lines = _unpack_kw_only_lines_py2(kw_only_args) + lines
-
-            args += "%s**_kw_only" % (", " if args else "",)  # leading comma
-        else:
-            args += "%s*, %s" % (
-                ", " if args else "",  # leading comma
-                ", ".join(kw_only_args),  # kw_only args
-            )
-    return (
-        """\
-def {init_name}(self, {args}):
-    {lines}
-""".format(
-            init_name=("__attrs_init__" if attrs_init else "__init__"),
-            args=args,
-            lines="\n    ".join(lines) if lines else "pass",
-        ),
-        names_for_globals,
-        annotations,
-    )
-
-
-class Attribute(object):
-    """
-    *Read-only* representation of an attribute.
-
-    Instances of this class are frequently used for introspection purposes
-    like:
-
-    - `fields` returns a tuple of them.
-    - Validators get them passed as the first argument.
-    - The *field transformer* hook receives a list of them.
-
-    :attribute name: The name of the attribute.
-    :attribute inherited: Whether or not that attribute has been inherited from
-        a base class.
-
-    Plus *all* arguments of `attr.ib` (except for ``factory``
-    which is only syntactic sugar for ``default=Factory(...)``.
-
-    .. versionadded:: 20.1.0 *inherited*
-    .. versionadded:: 20.1.0 *on_setattr*
-    .. versionchanged:: 20.2.0 *inherited* is not taken into account for
-        equality checks and hashing anymore.
-    .. versionadded:: 21.1.0 *eq_key* and *order_key*
-
-    For the full version history of the fields, see `attr.ib`.
-    """
-
-    __slots__ = (
-        "name",
-        "default",
-        "validator",
-        "repr",
-        "eq",
-        "eq_key",
-        "order",
-        "order_key",
-        "hash",
-        "init",
-        "metadata",
-        "type",
-        "converter",
-        "kw_only",
-        "inherited",
-        "on_setattr",
-    )
-
-    def __init__(
-        self,
-        name,
-        default,
-        validator,
-        repr,
-        cmp,  # XXX: unused, remove along with other cmp code.
-        hash,
-        init,
-        inherited,
-        metadata=None,
-        type=None,
-        converter=None,
-        kw_only=False,
-        eq=None,
-        eq_key=None,
-        order=None,
-        order_key=None,
-        on_setattr=None,
-    ):
-        eq, eq_key, order, order_key = _determine_attrib_eq_order(
-            cmp, eq_key or eq, order_key or order, True
-        )
-
-        # Cache this descriptor here to speed things up later.
-        bound_setattr = _obj_setattr.__get__(self, Attribute)
-
-        # Despite the big red warning, people *do* instantiate `Attribute`
-        # themselves.
-        bound_setattr("name", name)
-        bound_setattr("default", default)
-        bound_setattr("validator", validator)
-        bound_setattr("repr", repr)
-        bound_setattr("eq", eq)
-        bound_setattr("eq_key", eq_key)
-        bound_setattr("order", order)
-        bound_setattr("order_key", order_key)
-        bound_setattr("hash", hash)
-        bound_setattr("init", init)
-        bound_setattr("converter", converter)
-        bound_setattr(
-            "metadata",
-            (
-                metadata_proxy(metadata)
-                if metadata
-                else _empty_metadata_singleton
-            ),
-        )
-        bound_setattr("type", type)
-        bound_setattr("kw_only", kw_only)
-        bound_setattr("inherited", inherited)
-        bound_setattr("on_setattr", on_setattr)
-
-    def __setattr__(self, name, value):
-        raise FrozenInstanceError()
-
-    @classmethod
-    def from_counting_attr(cls, name, ca, type=None):
-        # type holds the annotated value. deal with conflicts:
-        if type is None:
-            type = ca.type
-        elif ca.type is not None:
-            raise ValueError(
-                "Type annotation and type argument cannot both be present"
-            )
-        inst_dict = {
-            k: getattr(ca, k)
-            for k in Attribute.__slots__
-            if k
-            not in (
-                "name",
-                "validator",
-                "default",
-                "type",
-                "inherited",
-            )  # exclude methods and deprecated alias
-        }
-        return cls(
-            name=name,
-            validator=ca._validator,
-            default=ca._default,
-            type=type,
-            cmp=None,
-            inherited=False,
-            **inst_dict
-        )
-
-    @property
-    def cmp(self):
-        """
-        Simulate the presence of a cmp attribute and warn.
-        """
-        warnings.warn(_CMP_DEPRECATION, DeprecationWarning, stacklevel=2)
-
-        return self.eq and self.order
-
-    # Don't use attr.evolve since fields(Attribute) doesn't work
-    def evolve(self, **changes):
-        """
-        Copy *self* and apply *changes*.
-
-        This works similarly to `attr.evolve` but that function does not work
-        with ``Attribute``.
-
-        It is mainly meant to be used for `transform-fields`.
-
-        .. versionadded:: 20.3.0
-        """
-        new = copy.copy(self)
-
-        new._setattrs(changes.items())
-
-        return new
-
-    # Don't use _add_pickle since fields(Attribute) doesn't work
-    def __getstate__(self):
-        """
-        Play nice with pickle.
-        """
-        return tuple(
-            getattr(self, name) if name != "metadata" else dict(self.metadata)
-            for name in self.__slots__
-        )
-
-    def __setstate__(self, state):
-        """
-        Play nice with pickle.
-        """
-        self._setattrs(zip(self.__slots__, state))
-
-    def _setattrs(self, name_values_pairs):
-        bound_setattr = _obj_setattr.__get__(self, Attribute)
-        for name, value in name_values_pairs:
-            if name != "metadata":
-                bound_setattr(name, value)
-            else:
-                bound_setattr(
-                    name,
-                    metadata_proxy(value)
-                    if value
-                    else _empty_metadata_singleton,
-                )
-
-
-_a = [
-    Attribute(
-        name=name,
-        default=NOTHING,
-        validator=None,
-        repr=True,
-        cmp=None,
-        eq=True,
-        order=False,
-        hash=(name != "metadata"),
-        init=True,
-        inherited=False,
-    )
-    for name in Attribute.__slots__
-]
-
-Attribute = _add_hash(
-    _add_eq(
-        _add_repr(Attribute, attrs=_a),
-        attrs=[a for a in _a if a.name != "inherited"],
-    ),
-    attrs=[a for a in _a if a.hash and a.name != "inherited"],
-)
-
-
-class _CountingAttr(object):
-    """
-    Intermediate representation of attributes that uses a counter to preserve
-    the order in which the attributes have been defined.
-
-    *Internal* data structure of the attrs library.  Running into is most
-    likely the result of a bug like a forgotten `@attr.s` decorator.
-    """
-
-    __slots__ = (
-        "counter",
-        "_default",
-        "repr",
-        "eq",
-        "eq_key",
-        "order",
-        "order_key",
-        "hash",
-        "init",
-        "metadata",
-        "_validator",
-        "converter",
-        "type",
-        "kw_only",
-        "on_setattr",
-    )
-    __attrs_attrs__ = tuple(
-        Attribute(
-            name=name,
-            default=NOTHING,
-            validator=None,
-            repr=True,
-            cmp=None,
-            hash=True,
-            init=True,
-            kw_only=False,
-            eq=True,
-            eq_key=None,
-            order=False,
-            order_key=None,
-            inherited=False,
-            on_setattr=None,
-        )
-        for name in (
-            "counter",
-            "_default",
-            "repr",
-            "eq",
-            "order",
-            "hash",
-            "init",
-            "on_setattr",
-        )
-    ) + (
-        Attribute(
-            name="metadata",
-            default=None,
-            validator=None,
-            repr=True,
-            cmp=None,
-            hash=False,
-            init=True,
-            kw_only=False,
-            eq=True,
-            eq_key=None,
-            order=False,
-            order_key=None,
-            inherited=False,
-            on_setattr=None,
-        ),
-    )
-    cls_counter = 0
-
-    def __init__(
-        self,
-        default,
-        validator,
-        repr,
-        cmp,
-        hash,
-        init,
-        converter,
-        metadata,
-        type,
-        kw_only,
-        eq,
-        eq_key,
-        order,
-        order_key,
-        on_setattr,
-    ):
-        _CountingAttr.cls_counter += 1
-        self.counter = _CountingAttr.cls_counter
-        self._default = default
-        self._validator = validator
-        self.converter = converter
-        self.repr = repr
-        self.eq = eq
-        self.eq_key = eq_key
-        self.order = order
-        self.order_key = order_key
-        self.hash = hash
-        self.init = init
-        self.metadata = metadata
-        self.type = type
-        self.kw_only = kw_only
-        self.on_setattr = on_setattr
-
-    def validator(self, meth):
-        """
-        Decorator that adds *meth* to the list of validators.
-
-        Returns *meth* unchanged.
-
-        .. versionadded:: 17.1.0
-        """
-        if self._validator is None:
-            self._validator = meth
-        else:
-            self._validator = and_(self._validator, meth)
-        return meth
-
-    def default(self, meth):
-        """
-        Decorator that allows to set the default for an attribute.
-
-        Returns *meth* unchanged.
-
-        :raises DefaultAlreadySetError: If default has been set before.
-
-        .. versionadded:: 17.1.0
-        """
-        if self._default is not NOTHING:
-            raise DefaultAlreadySetError()
-
-        self._default = Factory(meth, takes_self=True)
-
-        return meth
-
-
-_CountingAttr = _add_eq(_add_repr(_CountingAttr))
-
-
-class Factory(object):
-    """
-    Stores a factory callable.
-
-    If passed as the default value to `attr.ib`, the factory is used to
-    generate a new value.
-
-    :param callable factory: A callable that takes either none or exactly one
-        mandatory positional argument depending on *takes_self*.
-    :param bool takes_self: Pass the partially initialized instance that is
-        being initialized as a positional argument.
-
-    .. versionadded:: 17.1.0  *takes_self*
-    """
-
-    __slots__ = ("factory", "takes_self")
-
-    def __init__(self, factory, takes_self=False):
-        """
-        `Factory` is part of the default machinery so if we want a default
-        value here, we have to implement it ourselves.
-        """
-        self.factory = factory
-        self.takes_self = takes_self
-
-    def __getstate__(self):
-        """
-        Play nice with pickle.
-        """
-        return tuple(getattr(self, name) for name in self.__slots__)
-
-    def __setstate__(self, state):
-        """
-        Play nice with pickle.
-        """
-        for name, value in zip(self.__slots__, state):
-            setattr(self, name, value)
-
-
-_f = [
-    Attribute(
-        name=name,
-        default=NOTHING,
-        validator=None,
-        repr=True,
-        cmp=None,
-        eq=True,
-        order=False,
-        hash=True,
-        init=True,
-        inherited=False,
-    )
-    for name in Factory.__slots__
-]
-
-Factory = _add_hash(_add_eq(_add_repr(Factory, attrs=_f), attrs=_f), attrs=_f)
-
-
-def make_class(name, attrs, bases=(object,), **attributes_arguments):
-    """
-    A quick way to create a new class called *name* with *attrs*.
-
-    :param str name: The name for the new class.
-
-    :param attrs: A list of names or a dictionary of mappings of names to
-        attributes.
-
-        If *attrs* is a list or an ordered dict (`dict` on Python 3.6+,
-        `collections.OrderedDict` otherwise), the order is deduced from
-        the order of the names or attributes inside *attrs*.  Otherwise the
-        order of the definition of the attributes is used.
-    :type attrs: `list` or `dict`
-
-    :param tuple bases: Classes that the new class will subclass.
-
-    :param attributes_arguments: Passed unmodified to `attr.s`.
-
-    :return: A new class with *attrs*.
-    :rtype: type
-
-    .. versionadded:: 17.1.0 *bases*
-    .. versionchanged:: 18.1.0 If *attrs* is ordered, the order is retained.
-    """
-    if isinstance(attrs, dict):
-        cls_dict = attrs
-    elif isinstance(attrs, (list, tuple)):
-        cls_dict = dict((a, attrib()) for a in attrs)
-    else:
-        raise TypeError("attrs argument must be a dict or a list.")
-
-    pre_init = cls_dict.pop("__attrs_pre_init__", None)
-    post_init = cls_dict.pop("__attrs_post_init__", None)
-    user_init = cls_dict.pop("__init__", None)
-
-    body = {}
-    if pre_init is not None:
-        body["__attrs_pre_init__"] = pre_init
-    if post_init is not None:
-        body["__attrs_post_init__"] = post_init
-    if user_init is not None:
-        body["__init__"] = user_init
-
-    type_ = new_class(name, bases, {}, lambda ns: ns.update(body))
-
-    # For pickling to work, the __module__ variable needs to be set to the
-    # frame where the class is created.  Bypass this step in environments where
-    # sys._getframe is not defined (Jython for example) or sys._getframe is not
-    # defined for arguments greater than 0 (IronPython).
-    try:
-        type_.__module__ = sys._getframe(1).f_globals.get(
-            "__name__", "__main__"
-        )
-    except (AttributeError, ValueError):
-        pass
-
-    # We do it here for proper warnings with meaningful stacklevel.
-    cmp = attributes_arguments.pop("cmp", None)
-    (
-        attributes_arguments["eq"],
-        attributes_arguments["order"],
-    ) = _determine_attrs_eq_order(
-        cmp,
-        attributes_arguments.get("eq"),
-        attributes_arguments.get("order"),
-        True,
-    )
-
-    return _attrs(these=cls_dict, **attributes_arguments)(type_)
-
-
-# These are required by within this module so we define them here and merely
-# import into .validators / .converters.
-
-
-@attrs(slots=True, hash=True)
-class _AndValidator(object):
-    """
-    Compose many validators to a single one.
-    """
-
-    _validators = attrib()
-
-    def __call__(self, inst, attr, value):
-        for v in self._validators:
-            v(inst, attr, value)
-
-
-def and_(*validators):
-    """
-    A validator that composes multiple validators into one.
-
-    When called on a value, it runs all wrapped validators.
-
-    :param callables validators: Arbitrary number of validators.
-
-    .. versionadded:: 17.1.0
-    """
-    vals = []
-    for validator in validators:
-        vals.extend(
-            validator._validators
-            if isinstance(validator, _AndValidator)
-            else [validator]
-        )
-
-    return _AndValidator(tuple(vals))
-
-
-def pipe(*converters):
-    """
-    A converter that composes multiple converters into one.
-
-    When called on a value, it runs all wrapped converters, returning the
-    *last* value.
-
-    Type annotations will be inferred from the wrapped converters', if
-    they have any.
-
-    :param callables converters: Arbitrary number of converters.
-
-    .. versionadded:: 20.1.0
-    """
-
-    def pipe_converter(val):
-        for converter in converters:
-            val = converter(val)
-
-        return val
-
-    if not PY2:
-        if not converters:
-            # If the converter list is empty, pipe_converter is the identity.
-            A = typing.TypeVar("A")
-            pipe_converter.__annotations__ = {"val": A, "return": A}
-        else:
-            # Get parameter type.
-            sig = None
-            try:
-                sig = inspect.signature(converters[0])
-            except (ValueError, TypeError):  # inspect failed
-                pass
-            if sig:
-                params = list(sig.parameters.values())
-                if (
-                    params
-                    and params[0].annotation is not inspect.Parameter.empty
-                ):
-                    pipe_converter.__annotations__["val"] = params[
-                        0
-                    ].annotation
-            # Get return type.
-            sig = None
-            try:
-                sig = inspect.signature(converters[-1])
-            except (ValueError, TypeError):  # inspect failed
-                pass
-            if sig and sig.return_annotation is not inspect.Signature().empty:
-                pipe_converter.__annotations__[
-                    "return"
-                ] = sig.return_annotation
-
-    return pipe_converter
diff --git a/contrib/python/attrs/attr/_next_gen.py b/contrib/python/attrs/attr/_next_gen.py
deleted file mode 100644
index fab0af966a5..00000000000
--- a/contrib/python/attrs/attr/_next_gen.py
+++ /dev/null
@@ -1,158 +0,0 @@
-"""
-These are Python 3.6+-only and keyword-only APIs that call `attr.s` and
-`attr.ib` with different default values.
-"""
-
-from functools import partial
-
-from attr.exceptions import UnannotatedAttributeError
-
-from . import setters
-from ._make import NOTHING, _frozen_setattrs, attrib, attrs
-
-
-def define(
-    maybe_cls=None,
-    *,
-    these=None,
-    repr=None,
-    hash=None,
-    init=None,
-    slots=True,
-    frozen=False,
-    weakref_slot=True,
-    str=False,
-    auto_attribs=None,
-    kw_only=False,
-    cache_hash=False,
-    auto_exc=True,
-    eq=None,
-    order=False,
-    auto_detect=True,
-    getstate_setstate=None,
-    on_setattr=None,
-    field_transformer=None,
-):
-    r"""
-    The only behavioral differences are the handling of the *auto_attribs*
-    option:
-
-    :param Optional[bool] auto_attribs: If set to `True` or `False`, it behaves
-       exactly like `attr.s`. If left `None`, `attr.s` will try to guess:
-
-       1. If any attributes are annotated and no unannotated `attr.ib`\ s
-          are found, it assumes *auto_attribs=True*.
-       2. Otherwise it assumes *auto_attribs=False* and tries to collect
-          `attr.ib`\ s.
-
-    and that mutable classes (``frozen=False``) validate on ``__setattr__``.
-
-    .. versionadded:: 20.1.0
-    """
-
-    def do_it(cls, auto_attribs):
-        return attrs(
-            maybe_cls=cls,
-            these=these,
-            repr=repr,
-            hash=hash,
-            init=init,
-            slots=slots,
-            frozen=frozen,
-            weakref_slot=weakref_slot,
-            str=str,
-            auto_attribs=auto_attribs,
-            kw_only=kw_only,
-            cache_hash=cache_hash,
-            auto_exc=auto_exc,
-            eq=eq,
-            order=order,
-            auto_detect=auto_detect,
-            collect_by_mro=True,
-            getstate_setstate=getstate_setstate,
-            on_setattr=on_setattr,
-            field_transformer=field_transformer,
-        )
-
-    def wrap(cls):
-        """
-        Making this a wrapper ensures this code runs during class creation.
-
-        We also ensure that frozen-ness of classes is inherited.
-        """
-        nonlocal frozen, on_setattr
-
-        had_on_setattr = on_setattr not in (None, setters.NO_OP)
-
-        # By default, mutable classes validate on setattr.
-        if frozen is False and on_setattr is None:
-            on_setattr = setters.validate
-
-        # However, if we subclass a frozen class, we inherit the immutability
-        # and disable on_setattr.
-        for base_cls in cls.__bases__:
-            if base_cls.__setattr__ is _frozen_setattrs:
-                if had_on_setattr:
-                    raise ValueError(
-                        "Frozen classes can't use on_setattr "
-                        "(frozen-ness was inherited)."
-                    )
-
-                on_setattr = setters.NO_OP
-                break
-
-        if auto_attribs is not None:
-            return do_it(cls, auto_attribs)
-
-        try:
-            return do_it(cls, True)
-        except UnannotatedAttributeError:
-            return do_it(cls, False)
-
-    # maybe_cls's type depends on the usage of the decorator.  It's a class
-    # if it's used as `@attrs` but ``None`` if used as `@attrs()`.
-    if maybe_cls is None:
-        return wrap
-    else:
-        return wrap(maybe_cls)
-
-
-mutable = define
-frozen = partial(define, frozen=True, on_setattr=None)
-
-
-def field(
-    *,
-    default=NOTHING,
-    validator=None,
-    repr=True,
-    hash=None,
-    init=True,
-    metadata=None,
-    converter=None,
-    factory=None,
-    kw_only=False,
-    eq=None,
-    order=None,
-    on_setattr=None,
-):
-    """
-    Identical to `attr.ib`, except keyword-only and with some arguments
-    removed.
-
-    .. versionadded:: 20.1.0
-    """
-    return attrib(
-        default=default,
-        validator=validator,
-        repr=repr,
-        hash=hash,
-        init=init,
-        metadata=metadata,
-        converter=converter,
-        factory=factory,
-        kw_only=kw_only,
-        eq=eq,
-        order=order,
-        on_setattr=on_setattr,
-    )
diff --git a/contrib/python/attrs/attr/_version_info.py b/contrib/python/attrs/attr/_version_info.py
deleted file mode 100644
index 014e78a1b43..00000000000
--- a/contrib/python/attrs/attr/_version_info.py
+++ /dev/null
@@ -1,85 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-from functools import total_ordering
-
-from ._funcs import astuple
-from ._make import attrib, attrs
-
-
-@total_ordering
-@attrs(eq=False, order=False, slots=True, frozen=True)
-class VersionInfo(object):
-    """
-    A version object that can be compared to tuple of length 1--4:
-
-    >>> attr.VersionInfo(19, 1, 0, "final")  <= (19, 2)
-    True
-    >>> attr.VersionInfo(19, 1, 0, "final") < (19, 1, 1)
-    True
-    >>> vi = attr.VersionInfo(19, 2, 0, "final")
-    >>> vi < (19, 1, 1)
-    False
-    >>> vi < (19,)
-    False
-    >>> vi == (19, 2,)
-    True
-    >>> vi == (19, 2, 1)
-    False
-
-    .. versionadded:: 19.2
-    """
-
-    year = attrib(type=int)
-    minor = attrib(type=int)
-    micro = attrib(type=int)
-    releaselevel = attrib(type=str)
-
-    @classmethod
-    def _from_version_string(cls, s):
-        """
-        Parse *s* and return a _VersionInfo.
-        """
-        v = s.split(".")
-        if len(v) == 3:
-            v.append("final")
-
-        return cls(
-            year=int(v[0]), minor=int(v[1]), micro=int(v[2]), releaselevel=v[3]
-        )
-
-    def _ensure_tuple(self, other):
-        """
-        Ensure *other* is a tuple of a valid length.
-
-        Returns a possibly transformed *other* and ourselves as a tuple of
-        the same length as *other*.
-        """
-
-        if self.__class__ is other.__class__:
-            other = astuple(other)
-
-        if not isinstance(other, tuple):
-            raise NotImplementedError
-
-        if not (1 <= len(other) <= 4):
-            raise NotImplementedError
-
-        return astuple(self)[: len(other)], other
-
-    def __eq__(self, other):
-        try:
-            us, them = self._ensure_tuple(other)
-        except NotImplementedError:
-            return NotImplemented
-
-        return us == them
-
-    def __lt__(self, other):
-        try:
-            us, them = self._ensure_tuple(other)
-        except NotImplementedError:
-            return NotImplemented
-
-        # Since alphabetically "dev0" < "final" < "post1" < "post2", we don't
-        # have to do anything special with releaselevel for now.
-        return us < them
diff --git a/contrib/python/attrs/attr/_version_info.pyi b/contrib/python/attrs/attr/_version_info.pyi
deleted file mode 100644
index 45ced086337..00000000000
--- a/contrib/python/attrs/attr/_version_info.pyi
+++ /dev/null
@@ -1,9 +0,0 @@
-class VersionInfo:
-    @property
-    def year(self) -> int: ...
-    @property
-    def minor(self) -> int: ...
-    @property
-    def micro(self) -> int: ...
-    @property
-    def releaselevel(self) -> str: ...
diff --git a/contrib/python/attrs/attr/converters.py b/contrib/python/attrs/attr/converters.py
deleted file mode 100644
index 2777db6d0af..00000000000
--- a/contrib/python/attrs/attr/converters.py
+++ /dev/null
@@ -1,111 +0,0 @@
-"""
-Commonly useful converters.
-"""
-
-from __future__ import absolute_import, division, print_function
-
-from ._compat import PY2
-from ._make import NOTHING, Factory, pipe
-
-
-if not PY2:
-    import inspect
-    import typing
-
-
-__all__ = [
-    "pipe",
-    "optional",
-    "default_if_none",
-]
-
-
-def optional(converter):
-    """
-    A converter that allows an attribute to be optional. An optional attribute
-    is one which can be set to ``None``.
-
-    Type annotations will be inferred from the wrapped converter's, if it
-    has any.
-
-    :param callable converter: the converter that is used for non-``None``
-        values.
-
-    .. versionadded:: 17.1.0
-    """
-
-    def optional_converter(val):
-        if val is None:
-            return None
-        return converter(val)
-
-    if not PY2:
-        sig = None
-        try:
-            sig = inspect.signature(converter)
-        except (ValueError, TypeError):  # inspect failed
-            pass
-        if sig:
-            params = list(sig.parameters.values())
-            if params and params[0].annotation is not inspect.Parameter.empty:
-                optional_converter.__annotations__["val"] = typing.Optional[
-                    params[0].annotation
-                ]
-            if sig.return_annotation is not inspect.Signature.empty:
-                optional_converter.__annotations__["return"] = typing.Optional[
-                    sig.return_annotation
-                ]
-
-    return optional_converter
-
-
-def default_if_none(default=NOTHING, factory=None):
-    """
-    A converter that allows to replace ``None`` values by *default* or the
-    result of *factory*.
-
-    :param default: Value to be used if ``None`` is passed. Passing an instance
-       of `attr.Factory` is supported, however the ``takes_self`` option
-       is *not*.
-    :param callable factory: A callable that takes no parameters whose result
-       is used if ``None`` is passed.
-
-    :raises TypeError: If **neither** *default* or *factory* is passed.
-    :raises TypeError: If **both** *default* and *factory* are passed.
-    :raises ValueError: If an instance of `attr.Factory` is passed with
-       ``takes_self=True``.
-
-    .. versionadded:: 18.2.0
-    """
-    if default is NOTHING and factory is None:
-        raise TypeError("Must pass either `default` or `factory`.")
-
-    if default is not NOTHING and factory is not None:
-        raise TypeError(
-            "Must pass either `default` or `factory` but not both."
-        )
-
-    if factory is not None:
-        default = Factory(factory)
-
-    if isinstance(default, Factory):
-        if default.takes_self:
-            raise ValueError(
-                "`takes_self` is not supported by default_if_none."
-            )
-
-        def default_if_none_converter(val):
-            if val is not None:
-                return val
-
-            return default.factory()
-
-    else:
-
-        def default_if_none_converter(val):
-            if val is not None:
-                return val
-
-            return default
-
-    return default_if_none_converter
diff --git a/contrib/python/attrs/attr/converters.pyi b/contrib/python/attrs/attr/converters.pyi
deleted file mode 100644
index 84a57590b0f..00000000000
--- a/contrib/python/attrs/attr/converters.pyi
+++ /dev/null
@@ -1,13 +0,0 @@
-from typing import Callable, Optional, TypeVar, overload
-
-from . import _ConverterType
-
-
-_T = TypeVar("_T")
-
-def pipe(*validators: _ConverterType) -> _ConverterType: ...
-def optional(converter: _ConverterType) -> _ConverterType: ...
-@overload
-def default_if_none(default: _T) -> _ConverterType: ...
-@overload
-def default_if_none(*, factory: Callable[[], _T]) -> _ConverterType: ...
diff --git a/contrib/python/attrs/attr/exceptions.py b/contrib/python/attrs/attr/exceptions.py
deleted file mode 100644
index f6f9861bea9..00000000000
--- a/contrib/python/attrs/attr/exceptions.py
+++ /dev/null
@@ -1,92 +0,0 @@
-from __future__ import absolute_import, division, print_function
-
-
-class FrozenError(AttributeError):
-    """
-    A frozen/immutable instance or attribute have been attempted to be
-    modified.
-
-    It mirrors the behavior of ``namedtuples`` by using the same error message
-    and subclassing `AttributeError`.
-
-    .. versionadded:: 20.1.0
-    """
-
-    msg = "can't set attribute"
-    args = [msg]
-
-
-class FrozenInstanceError(FrozenError):
-    """
-    A frozen instance has been attempted to be modified.
-
-    .. versionadded:: 16.1.0
-    """
-
-
-class FrozenAttributeError(FrozenError):
-    """
-    A frozen attribute has been attempted to be modified.
-
-    .. versionadded:: 20.1.0
-    """
-
-
-class AttrsAttributeNotFoundError(ValueError):
-    """
-    An ``attrs`` function couldn't find an attribute that the user asked for.
-
-    .. versionadded:: 16.2.0
-    """
-
-
-class NotAnAttrsClassError(ValueError):
-    """
-    A non-``attrs`` class has been passed into an ``attrs`` function.
-
-    .. versionadded:: 16.2.0
-    """
-
-
-class DefaultAlreadySetError(RuntimeError):
-    """
-    A default has been set using ``attr.ib()`` and is attempted to be reset
-    using the decorator.
-
-    .. versionadded:: 17.1.0
-    """
-
-
-class UnannotatedAttributeError(RuntimeError):
-    """
-    A class with ``auto_attribs=True`` has an ``attr.ib()`` without a type
-    annotation.
-
-    .. versionadded:: 17.3.0
-    """
-
-
-class PythonTooOldError(RuntimeError):
-    """
-    It was attempted to use an ``attrs`` feature that requires a newer Python
-    version.
-
-    .. versionadded:: 18.2.0
-    """
-
-
-class NotCallableError(TypeError):
-    """
-    A ``attr.ib()`` requiring a callable has been set with a value
-    that is not callable.
-
-    .. versionadded:: 19.2.0
-    """
-
-    def __init__(self, msg, value):
-        super(TypeError, self).__init__(msg, value)
-        self.msg = msg
-        self.value = value
-
-    def __str__(self):
-        return str(self.msg)
diff --git a/contrib/python/attrs/attr/exceptions.pyi b/contrib/python/attrs/attr/exceptions.pyi
deleted file mode 100644
index a800fb26bba..00000000000
--- a/contrib/python/attrs/attr/exceptions.pyi
+++ /dev/null
@@ -1,18 +0,0 @@
-from typing import Any
-
-
-class FrozenError(AttributeError):
-    msg: str = ...
-
-class FrozenInstanceError(FrozenError): ...
-class FrozenAttributeError(FrozenError): ...
-class AttrsAttributeNotFoundError(ValueError): ...
-class NotAnAttrsClassError(ValueError): ...
-class DefaultAlreadySetError(RuntimeError): ...
-class UnannotatedAttributeError(RuntimeError): ...
-class PythonTooOldError(RuntimeError): ...
-
-class NotCallableError(TypeError):
-    msg: str = ...
-    value: Any = ...
-    def __init__(self, msg: str, value: Any) -> None: ...
diff --git a/contrib/python/attrs/attr/filters.py b/contrib/python/attrs/attr/filters.py
deleted file mode 100644
index dc47e8fa38c..00000000000
--- a/contrib/python/attrs/attr/filters.py
+++ /dev/null
@@ -1,52 +0,0 @@
-"""
-Commonly useful filters for `attr.asdict`.
-"""
-
-from __future__ import absolute_import, division, print_function
-
-from ._compat import isclass
-from ._make import Attribute
-
-
-def _split_what(what):
-    """
-    Returns a tuple of `frozenset`s of classes and attributes.
-    """
-    return (
-        frozenset(cls for cls in what if isclass(cls)),
-        frozenset(cls for cls in what if isinstance(cls, Attribute)),
-    )
-
-
-def include(*what):
-    """
-    Whitelist *what*.
-
-    :param what: What to whitelist.
-    :type what: `list` of `type` or `attr.Attribute`\\ s
-
-    :rtype: `callable`
-    """
-    cls, attrs = _split_what(what)
-
-    def include_(attribute, value):
-        return value.__class__ in cls or attribute in attrs
-
-    return include_
-
-
-def exclude(*what):
-    """
-    Blacklist *what*.
-
-    :param what: What to blacklist.
-    :type what: `list` of classes or `attr.Attribute`\\ s.
-
-    :rtype: `callable`
-    """
-    cls, attrs = _split_what(what)
-
-    def exclude_(attribute, value):
-        return value.__class__ not in cls and attribute not in attrs
-
-    return exclude_
diff --git a/contrib/python/attrs/attr/filters.pyi b/contrib/python/attrs/attr/filters.pyi
deleted file mode 100644
index f7b63f1bb45..00000000000
--- a/contrib/python/attrs/attr/filters.pyi
+++ /dev/null
@@ -1,7 +0,0 @@
-from typing import Any, Union
-
-from . import Attribute, _FilterType
-
-
-def include(*what: Union[type, Attribute[Any]]) -> _FilterType[Any]: ...
-def exclude(*what: Union[type, Attribute[Any]]) -> _FilterType[Any]: ...
diff --git a/contrib/python/attrs/attr/py.typed b/contrib/python/attrs/attr/py.typed
deleted file mode 100644
index e69de29bb2d..00000000000
--- a/contrib/python/attrs/attr/py.typed
+++ /dev/null
diff --git a/contrib/python/attrs/attr/setters.py b/contrib/python/attrs/attr/setters.py
deleted file mode 100644
index 240014b3c1e..00000000000
--- a/contrib/python/attrs/attr/setters.py
+++ /dev/null
@@ -1,77 +0,0 @@
-"""
-Commonly used hooks for on_setattr.
-"""
-
-from __future__ import absolute_import, division, print_function
-
-from . import _config
-from .exceptions import FrozenAttributeError
-
-
-def pipe(*setters):
-    """
-    Run all *setters* and return the return value of the last one.
-
-    .. versionadded:: 20.1.0
-    """
-
-    def wrapped_pipe(instance, attrib, new_value):
-        rv = new_value
-
-        for setter in setters:
-            rv = setter(instance, attrib, rv)
-
-        return rv
-
-    return wrapped_pipe
-
-
-def frozen(_, __, ___):
-    """
-    Prevent an attribute to be modified.
-
-    .. versionadded:: 20.1.0
-    """
-    raise FrozenAttributeError()
-
-
-def validate(instance, attrib, new_value):
-    """
-    Run *attrib*'s validator on *new_value* if it has one.
-
-    .. versionadded:: 20.1.0
-    """
-    if _config._run_validators is False:
-        return new_value
-
-    v = attrib.validator
-    if not v:
-        return new_value
-
-    v(instance, attrib, new_value)
-
-    return new_value
-
-
-def convert(instance, attrib, new_value):
-    """
-    Run *attrib*'s converter -- if it has one --  on *new_value* and return the
-    result.
-
-    .. versionadded:: 20.1.0
-    """
-    c = attrib.converter
-    if c:
-        return c(new_value)
-
-    return new_value
-
-
-NO_OP = object()
-"""
-Sentinel for disabling class-wide *on_setattr* hooks for certain attributes.
-
-Does not work in `pipe` or within lists.
-
-.. versionadded:: 20.1.0
-"""
diff --git a/contrib/python/attrs/attr/setters.pyi b/contrib/python/attrs/attr/setters.pyi
deleted file mode 100644
index a921e07deb6..00000000000
--- a/contrib/python/attrs/attr/setters.pyi
+++ /dev/null
@@ -1,20 +0,0 @@
-from typing import Any, NewType, NoReturn, TypeVar, cast
-
-from . import Attribute, _OnSetAttrType
-
-
-_T = TypeVar("_T")
-
-def frozen(
-    instance: Any, attribute: Attribute[Any], new_value: Any
-) -> NoReturn: ...
-def pipe(*setters: _OnSetAttrType) -> _OnSetAttrType: ...
-def validate(instance: Any, attribute: Attribute[_T], new_value: _T) -> _T: ...
-
-# convert is allowed to return Any, because they can be chained using pipe.
-def convert(
-    instance: Any, attribute: Attribute[Any], new_value: Any
-) -> Any: ...
-
-_NoOpType = NewType("_NoOpType", object)
-NO_OP: _NoOpType
diff --git a/contrib/python/attrs/attr/validators.py b/contrib/python/attrs/attr/validators.py
deleted file mode 100644
index b9a73054e9c..00000000000
--- a/contrib/python/attrs/attr/validators.py
+++ /dev/null
@@ -1,379 +0,0 @@
-"""
-Commonly useful validators.
-"""
-
-from __future__ import absolute_import, division, print_function
-
-import re
-
-from ._make import _AndValidator, and_, attrib, attrs
-from .exceptions import NotCallableError
-
-
-__all__ = [
-    "and_",
-    "deep_iterable",
-    "deep_mapping",
-    "in_",
-    "instance_of",
-    "is_callable",
-    "matches_re",
-    "optional",
-    "provides",
-]
-
-
-@attrs(repr=False, slots=True, hash=True)
-class _InstanceOfValidator(object):
-    type = attrib()
-
-    def __call__(self, inst, attr, value):
-        """
-        We use a callable class to be able to change the ``__repr__``.
-        """
-        if not isinstance(value, self.type):
-            raise TypeError(
-                "'{name}' must be {type!r} (got {value!r} that is a "
-                "{actual!r}).".format(
-                    name=attr.name,
-                    type=self.type,
-                    actual=value.__class__,
-                    value=value,
-                ),
-                attr,
-                self.type,
-                value,
-            )
-
-    def __repr__(self):
-        return "<instance_of validator for type {type!r}>".format(
-            type=self.type
-        )
-
-
-def instance_of(type):
-    """
-    A validator that raises a `TypeError` if the initializer is called
-    with a wrong type for this particular attribute (checks are performed using
-    `isinstance` therefore it's also valid to pass a tuple of types).
-
-    :param type: The type to check for.
-    :type type: type or tuple of types
-
-    :raises TypeError: With a human readable error message, the attribute
-        (of type `attr.Attribute`), the expected type, and the value it
-        got.
-    """
-    return _InstanceOfValidator(type)
-
-
-@attrs(repr=False, frozen=True, slots=True)
-class _MatchesReValidator(object):
-    regex = attrib()
-    flags = attrib()
-    match_func = attrib()
-
-    def __call__(self, inst, attr, value):
-        """
-        We use a callable class to be able to change the ``__repr__``.
-        """
-        if not self.match_func(value):
-            raise ValueError(
-                "'{name}' must match regex {regex!r}"
-                " ({value!r} doesn't)".format(
-                    name=attr.name, regex=self.regex.pattern, value=value
-                ),
-                attr,
-                self.regex,
-                value,
-            )
-
-    def __repr__(self):
-        return "<matches_re validator for pattern {regex!r}>".format(
-            regex=self.regex
-        )
-
-
-def matches_re(regex, flags=0, func=None):
-    r"""
-    A validator that raises `ValueError` if the initializer is called
-    with a string that doesn't match *regex*.
-
-    :param str regex: a regex string to match against
-    :param int flags: flags that will be passed to the underlying re function
-        (default 0)
-    :param callable func: which underlying `re` function to call (options
-        are `re.fullmatch`, `re.search`, `re.match`, default
-        is ``None`` which means either `re.fullmatch` or an emulation of
-        it on Python 2). For performance reasons, they won't be used directly
-        but on a pre-`re.compile`\ ed pattern.
-
-    .. versionadded:: 19.2.0
-    """
-    fullmatch = getattr(re, "fullmatch", None)
-    valid_funcs = (fullmatch, None, re.search, re.match)
-    if func not in valid_funcs:
-        raise ValueError(
-            "'func' must be one of %s."
-            % (
-                ", ".join(
-                    sorted(
-                        e and e.__name__ or "None" for e in set(valid_funcs)
-                    )
-                ),
-            )
-        )
-
-    pattern = re.compile(regex, flags)
-    if func is re.match:
-        match_func = pattern.match
-    elif func is re.search:
-        match_func = pattern.search
-    else:
-        if fullmatch:
-            match_func = pattern.fullmatch
-        else:
-            pattern = re.compile(r"(?:{})\Z".format(regex), flags)
-            match_func = pattern.match
-
-    return _MatchesReValidator(pattern, flags, match_func)
-
-
-@attrs(repr=False, slots=True, hash=True)
-class _ProvidesValidator(object):
-    interface = attrib()
-
-    def __call__(self, inst, attr, value):
-        """
-        We use a callable class to be able to change the ``__repr__``.
-        """
-        if not self.interface.providedBy(value):
-            raise TypeError(
-                "'{name}' must provide {interface!r} which {value!r} "
-                "doesn't.".format(
-                    name=attr.name, interface=self.interface, value=value
-                ),
-                attr,
-                self.interface,
-                value,
-            )
-
-    def __repr__(self):
-        return "<provides validator for interface {interface!r}>".format(
-            interface=self.interface
-        )
-
-
-def provides(interface):
-    """
-    A validator that raises a `TypeError` if the initializer is called
-    with an object that does not provide the requested *interface* (checks are
-    performed using ``interface.providedBy(value)`` (see `zope.interface
-    <https://zopeinterface.readthedocs.io/en/latest/>`_).
-
-    :param interface: The interface to check for.
-    :type interface: ``zope.interface.Interface``
-
-    :raises TypeError: With a human readable error message, the attribute
-        (of type `attr.Attribute`), the expected interface, and the
-        value it got.
-    """
-    return _ProvidesValidator(interface)
-
-
-@attrs(repr=False, slots=True, hash=True)
-class _OptionalValidator(object):
-    validator = attrib()
-
-    def __call__(self, inst, attr, value):
-        if value is None:
-            return
-
-        self.validator(inst, attr, value)
-
-    def __repr__(self):
-        return "<optional validator for {what} or None>".format(
-            what=repr(self.validator)
-        )
-
-
-def optional(validator):
-    """
-    A validator that makes an attribute optional.  An optional attribute is one
-    which can be set to ``None`` in addition to satisfying the requirements of
-    the sub-validator.
-
-    :param validator: A validator (or a list of validators) that is used for
-        non-``None`` values.
-    :type validator: callable or `list` of callables.
-
-    .. versionadded:: 15.1.0
-    .. versionchanged:: 17.1.0 *validator* can be a list of validators.
-    """
-    if isinstance(validator, list):
-        return _OptionalValidator(_AndValidator(validator))
-    return _OptionalValidator(validator)
-
-
-@attrs(repr=False, slots=True, hash=True)
-class _InValidator(object):
-    options = attrib()
-
-    def __call__(self, inst, attr, value):
-        try:
-            in_options = value in self.options
-        except TypeError:  # e.g. `1 in "abc"`
-            in_options = False
-
-        if not in_options:
-            raise ValueError(
-                "'{name}' must be in {options!r} (got {value!r})".format(
-                    name=attr.name, options=self.options, value=value
-                )
-            )
-
-    def __repr__(self):
-        return "<in_ validator with options {options!r}>".format(
-            options=self.options
-        )
-
-
-def in_(options):
-    """
-    A validator that raises a `ValueError` if the initializer is called
-    with a value that does not belong in the options provided.  The check is
-    performed using ``value in options``.
-
-    :param options: Allowed options.
-    :type options: list, tuple, `enum.Enum`, ...
-
-    :raises ValueError: With a human readable error message, the attribute (of
-       type `attr.Attribute`), the expected options, and the value it
-       got.
-
-    .. versionadded:: 17.1.0
-    """
-    return _InValidator(options)
-
-
-@attrs(repr=False, slots=False, hash=True)
-class _IsCallableValidator(object):
-    def __call__(self, inst, attr, value):
-        """
-        We use a callable class to be able to change the ``__repr__``.
-        """
-        if not callable(value):
-            message = (
-                "'{name}' must be callable "
-                "(got {value!r} that is a {actual!r})."
-            )
-            raise NotCallableError(
-                msg=message.format(
-                    name=attr.name, value=value, actual=value.__class__
-                ),
-                value=value,
-            )
-
-    def __repr__(self):
-        return "<is_callable validator>"
-
-
-def is_callable():
-    """
-    A validator that raises a `attr.exceptions.NotCallableError` if the
-    initializer is called with a value for this particular attribute
-    that is not callable.
-
-    .. versionadded:: 19.1.0
-
-    :raises `attr.exceptions.NotCallableError`: With a human readable error
-        message containing the attribute (`attr.Attribute`) name,
-        and the value it got.
-    """
-    return _IsCallableValidator()
-
-
-@attrs(repr=False, slots=True, hash=True)
-class _DeepIterable(object):
-    member_validator = attrib(validator=is_callable())
-    iterable_validator = attrib(
-        default=None, validator=optional(is_callable())
-    )
-
-    def __call__(self, inst, attr, value):
-        """
-        We use a callable class to be able to change the ``__repr__``.
-        """
-        if self.iterable_validator is not None:
-            self.iterable_validator(inst, attr, value)
-
-        for member in value:
-            self.member_validator(inst, attr, member)
-
-    def __repr__(self):
-        iterable_identifier = (
-            ""
-            if self.iterable_validator is None
-            else " {iterable!r}".format(iterable=self.iterable_validator)
-        )
-        return (
-            "<deep_iterable validator for{iterable_identifier}"
-            " iterables of {member!r}>"
-        ).format(
-            iterable_identifier=iterable_identifier,
-            member=self.member_validator,
-        )
-
-
-def deep_iterable(member_validator, iterable_validator=None):
-    """
-    A validator that performs deep validation of an iterable.
-
-    :param member_validator: Validator to apply to iterable members
-    :param iterable_validator: Validator to apply to iterable itself
-        (optional)
-
-    .. versionadded:: 19.1.0
-
-    :raises TypeError: if any sub-validators fail
-    """
-    return _DeepIterable(member_validator, iterable_validator)
-
-
-@attrs(repr=False, slots=True, hash=True)
-class _DeepMapping(object):
-    key_validator = attrib(validator=is_callable())
-    value_validator = attrib(validator=is_callable())
-    mapping_validator = attrib(default=None, validator=optional(is_callable()))
-
-    def __call__(self, inst, attr, value):
-        """
-        We use a callable class to be able to change the ``__repr__``.
-        """
-        if self.mapping_validator is not None:
-            self.mapping_validator(inst, attr, value)
-
-        for key in value:
-            self.key_validator(inst, attr, key)
-            self.value_validator(inst, attr, value[key])
-
-    def __repr__(self):
-        return (
-            "<deep_mapping validator for objects mapping {key!r} to {value!r}>"
-        ).format(key=self.key_validator, value=self.value_validator)
-
-
-def deep_mapping(key_validator, value_validator, mapping_validator=None):
-    """
-    A validator that performs deep validation of a dictionary.
-
-    :param key_validator: Validator to apply to dictionary keys
-    :param value_validator: Validator to apply to dictionary values
-    :param mapping_validator: Validator to apply to top-level mapping
-        attribute (optional)
-
-    .. versionadded:: 19.1.0
-
-    :raises TypeError: if any sub-validators fail
-    """
-    return _DeepMapping(key_validator, value_validator, mapping_validator)
diff --git a/contrib/python/attrs/attr/validators.pyi b/contrib/python/attrs/attr/validators.pyi
deleted file mode 100644
index fe92aac421b..00000000000
--- a/contrib/python/attrs/attr/validators.pyi
+++ /dev/null
@@ -1,68 +0,0 @@
-from typing import (
-    Any,
-    AnyStr,
-    Callable,
-    Container,
-    Iterable,
-    List,
-    Mapping,
-    Match,
-    Optional,
-    Tuple,
-    Type,
-    TypeVar,
-    Union,
-    overload,
-)
-
-from . import _ValidatorType
-
-
-_T = TypeVar("_T")
-_T1 = TypeVar("_T1")
-_T2 = TypeVar("_T2")
-_T3 = TypeVar("_T3")
-_I = TypeVar("_I", bound=Iterable)
-_K = TypeVar("_K")
-_V = TypeVar("_V")
-_M = TypeVar("_M", bound=Mapping)
-
-# To be more precise on instance_of use some overloads.
-# If there are more than 3 items in the tuple then we fall back to Any
-@overload
-def instance_of(type: Type[_T]) -> _ValidatorType[_T]: ...
-@overload
-def instance_of(type: Tuple[Type[_T]]) -> _ValidatorType[_T]: ...
-@overload
-def instance_of(
-    type: Tuple[Type[_T1], Type[_T2]]
-) -> _ValidatorType[Union[_T1, _T2]]: ...
-@overload
-def instance_of(
-    type: Tuple[Type[_T1], Type[_T2], Type[_T3]]
-) -> _ValidatorType[Union[_T1, _T2, _T3]]: ...
-@overload
-def instance_of(type: Tuple[type, ...]) -> _ValidatorType[Any]: ...
-def provides(interface: Any) -> _ValidatorType[Any]: ...
-def optional(
-    validator: Union[_ValidatorType[_T], List[_ValidatorType[_T]]]
-) -> _ValidatorType[Optional[_T]]: ...
-def in_(options: Container[_T]) -> _ValidatorType[_T]: ...
-def and_(*validators: _ValidatorType[_T]) -> _ValidatorType[_T]: ...
-def matches_re(
-    regex: AnyStr,
-    flags: int = ...,
-    func: Optional[
-        Callable[[AnyStr, AnyStr, int], Optional[Match[AnyStr]]]
-    ] = ...,
-) -> _ValidatorType[AnyStr]: ...
-def deep_iterable(
-    member_validator: _ValidatorType[_T],
-    iterable_validator: Optional[_ValidatorType[_I]] = ...,
-) -> _ValidatorType[_I]: ...
-def deep_mapping(
-    key_validator: _ValidatorType[_K],
-    value_validator: _ValidatorType[_V],
-    mapping_validator: Optional[_ValidatorType[_M]] = ...,
-) -> _ValidatorType[_M]: ...
-def is_callable() -> _ValidatorType[_T]: ...