[issue20784] 'collections.abc' is no longer defined when collections is imported

[Larry Hastings]

Larry Hastings added the comment:

> So, it's a very common idiom.

"Common" doesn't imply "correct" or "supported".  There are plenty of other packages/modules who don't import their subpackages/submodules during initialization.  Unless explicitly supported by the module, using a submodule without explicitly importing it is relying on undefined behavior.

I stand by my statement.

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<http://bugs.python.org/issue20784>
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