[issue17636] Modify IMPORT_FROM to fallback on sys.modules

[Brett Cannon]

Brett Cannon added the comment:

If you look at the importlib source code in 2.7 it's actually really small and simply translates the call into an __import__ call under the hood. So __import__ can completely handle relative imports, but you were not using the level argument to __import__ nor passing the necessary globals to make the relative name computation work (see the importlib source if you want to see how it works).

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