Add six.moves.collections.abc

[benjaminp]

Originally reported by: Eklavya Sharma (Bitbucket: ekujupr, GitHub: Unknown)

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I'm fed up of doing

try:
    import collections.abc as collections_abc # only works on python 3.3+
except ImportError:
    import collections as collections_abc

A six.moves.collections.abc would be very convenient.

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• Bitbucket: https://bitbucket.org/gutworth/six/issue/155

[WildCard65]

Bumping this issue as Python 3.7 (once it release) may end up giving a deprecation warning for using classes from collections.abc in collections itself.

Reference: python/cpython#5460

[haikuginger]

I'm 👍 on this request. With the removal of the collections.abc items from collections in Python 3.8, now is the right time to do this so we can transition appropriately.

Reference: urllib3/urllib3#1324

[NeilGirdhar]

Duplicate of #241

[nickwilliams-eventbrite]

Duplicate of #241

This is not correct. This is an issue. #241 is a pull request. In fact, #241's comment specifically says that it resolves #155 (this). So ... this is not a duplicate. It's the companion issue to the #241 pull request.

[WildCard65]

To add onto what @nickwilliams-eventbrite said, should #241 get accepted, GitHub will automatically close this issue as the PR's comment has "closes " in it.

[NeilGirdhar]

oh right, sorry, was quickly searching for #241, and ran into this in the search.