[issue17636] Modify IMPORT_FROM to fallback on sys.modules

[Nick Coghlan]

Nick Coghlan added the comment:

If I understand your question correctly, then yes, __package__ should be
used when converting explicit relative imports to absolute ones.

To write a test, run a submodule that needs the new fallback feature via
the -m switch (it will fail if using __name__)

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<http://bugs.python.org/issue17636>
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