[issue17636] Modify IMPORT_FROM to fallback on sys.modules

[Phillip J. Eby]

Phillip J. Eby added the comment:

I don't care much one way or the other about it being considered a bug
in 2.x, but it might be worth considering a bug in 3.x.

Either way, though, the language reference for "from import" should
reflect the change, and "alternative implementations" should be
informed of the update.

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