"""Shim to maintain backwards compatibility with old IPython.nbformat imports."""# Copyright (c) IPython Development Team.# Distributed under the terms of the Modified BSD License.importsysfromwarningsimportwarnfromIPython.utils.shimmoduleimportShimModule,ShimWarningwarn("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 abovesys.modules['IPython.nbformat']=ShimModule(src='IPython.nbformat',mirror='nbformat')