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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')