intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 29 insertions, 0 deletions

diff --git a/contrib/python/ipython/py2/IPython/frontend.py b/contrib/python/ipython/py2/IPython/frontend.py
new file mode 100644
index 00000000000..9cc3eaff2f0
--- /dev/null
+++ b/contrib/python/ipython/py2/IPython/frontend.py
@@ -0,0 +1,29 @@
+"""
+Shim to maintain backwards compatibility with old frontend imports.
+
+We have moved all contents of the old `frontend` subpackage into top-level
+subpackages (`html`, `qt` and `terminal`), and flattened the notebook into
+just `IPython.html`, formerly `IPython.frontend.html.notebook`.
+
+This will let code that was making `from IPython.frontend...` calls continue
+working, though a warning will be printed.
+"""
+
+# Copyright (c) IPython Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+import sys
+from warnings import warn
+
+from IPython.utils.shimmodule import ShimModule, ShimWarning
+
+warn("The top-level `frontend` package has been deprecated since IPython 1.0. "
+     "All its subpackages have been moved to the top `IPython` level.", ShimWarning)
+
+# Unconditionally insert the shim into sys.modules so that further import calls
+# trigger the custom attribute access above
+
+sys.modules['IPython.frontend.html.notebook'] = ShimModule(
+    src='IPython.frontend.html.notebook', mirror='IPython.html')
+sys.modules['IPython.frontend'] = ShimModule(
+    src='IPython.frontend', mirror='IPython')