[issue11085] expose _abcoll as collections.abc

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

> Why not just put them in the 'abc' namespace?

Two reasons:
* There are lots of ABCs scattered throughout the standard libary that aren't collections ABCs (the importlib ABCs and IO ABCs for example).
* Guido viewed collections ABCs as tightly associated with collections.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11085>
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