hub/venv/lib/python3.7/site-packages/IPython/frontend.py

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"""
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')