[issue17621] Create a lazy import loader mixin

[Roundup Robot]

Roundup Robot added the comment:

New changeset 52b58618199c by Brett Cannon in branch 'default':
Issue #17621: Introduce importlib.util.LazyLoader.
http://hg.python.org/cpython/rev/52b58618199c

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nosy: +python-dev

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<http://bugs.python.org/issue17621>
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