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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. "

"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')