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"""
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Shim to maintain backwards compatibility with old frontend imports.
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We have moved all contents of the old `frontend` subpackage into top-level
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subpackages (`html`, `qt` and `terminal`), and flattened the notebook into
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just `IPython.html`, formerly `IPython.frontend.html.notebook`.
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This will let code that was making `from IPython.frontend...` calls continue
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working, though a warning will be printed.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import sys
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from warnings import warn
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from IPython.utils.shimmodule import ShimModule, ShimWarning
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warn("The top-level `frontend` package has been deprecated. "
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"All its subpackages have been moved to the top `IPython` level.", ShimWarning)
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# Unconditionally insert the shim into sys.modules so that further import calls
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# trigger the custom attribute access above
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sys.modules['IPython.frontend.html.notebook'] = ShimModule(
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src='IPython.frontend.html.notebook', mirror='IPython.html')
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sys.modules['IPython.frontend'] = ShimModule(
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src='IPython.frontend', mirror='IPython')
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