[issue19944] Make importlib.find_spec load packages as needed

[Eric Snow]

Eric Snow added the comment:

Nick: that sounds good to me.  I like the idea of find_spec() being the same as import_module(), minus actually loading the module.

In that spirit, here's a rough patch that accomplishes that.  It refactors things a bit to get there.  Considering where we are in the release cycle, I'd rather punt on a proper rendition like this this until 3.5.  In the meantime we could duplicate some code for the sake of find_spec() in the 3.4 timeframe.

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Added file: http://bugs.python.org/file33111/issue19944-find-spec-mirror-import-module.diff

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