[issue15314] Use importlib instead of pkgutil in runpy

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

OK, I just pushed a tweak to the test that will hopefully resolve the problem. If the tweak works, though, it does suggest we have a bit of weirdness in importlib: it means pkgutil.get_importer("") is returning an importer on POSIX systems, but None on Windows.

The test tweak to get OS X passing for #15230 on 3.2 (where it was already passing on trunk) suggests we may also have a case where 3.2 called os.path.realpath() before setting __file__, while 3.3 does not.

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<http://bugs.python.org/issue15314>
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