[issue19842] selectors: refactor BaseSelector implementation

[STINNER Victor]

STINNER Victor added the comment:

> I think that's a cleaner design.

For common containers like Sequence or Mapping, ABC are useful. But I don't expect new implementations of BaseSelector. Is it just for purity? :-p

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nosy: +haypo

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<http://bugs.python.org/issue19842>
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