[issue19172] selectors: add keys() method

[Antoine Pitrou]

Antoine Pitrou added the comment:

> FWIW, I think the "ideal" solution would be for keys() (*) to return a
> read-only Mapping implementation, allowing for file object lookup (using
> __getitem__) as well as iteration on SelectorKeys (using __iter__) and
> fast emptiness checking (using __len__).

Actually, you would use values() to iterate on SelectorKeys.

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<http://bugs.python.org/issue19172>
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