[issue19944] Make importlib.find_spec load packages as needed

[Nick Coghlan]

Nick Coghlan added the comment:

The "simple" patch actually looks like a good way to end up with find_spec specific bugs because it diverges from the more thoroughly tested main import path (e.g. it looks to me like it doesn't release the import lock properly)

So the _FoundSpec version actually looks better to me, because it keeps find_spec more inline with actual imports.

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<http://bugs.python.org/issue19944>
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