[issue18864] Implementation for PEP 451 (importlib.machinery.ModuleSpec)

[Eric Snow]

Eric Snow added the comment:

Here's an updated patch that implements the meat of the current PEP.  Docs are still lacking and I could probably add a few more tests.  Other key things left to do:

* deprecations and removals
* refactor importlib finders and loaders to use the new Finder/Loader APIs
* refactor pythonrun.c to make use of __spec__
* adjust other APIs to use __spec__ (pickle, etc.)

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Added file: http://bugs.python.org/file32407/modulespec-primary-changes.diff

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