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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> I'm pretty sure that if you import "x", there are zero guarantees that
> "x.y" will work.  The offical line is that you must explicitly import
> all the deepest submodules you use.

I'm not sure why you're saying that. I think it's quite common to only
"import os" and then use os.path.

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