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"""
Shim to maintain backwards compatibility with old IPython.nbformat imports.
"""
# 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 `IPython.nbformat` package has been deprecated since IPython 4.0. "
"You should import from nbformat instead.", ShimWarning)
# Unconditionally insert the shim into sys.modules so that further import calls
# trigger the custom attribute access above
sys.modules['IPython.nbformat'] = ShimModule(
src='IPython.nbformat', mirror='nbformat')
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