[issue19172] selectors: add keys() method

[Charles-François Natali]

Charles-François Natali added the comment:

> Berker Peksag added the comment:
>
> +   .. method:: get_map()
> +
> +      Return a mapping of file objects to selector keys.
>
> I kind of feel like a walking linter though I think this needs a versionadded tag :)

Well, selectors have been added to 3.4 - which hasn't been released
yet - so no versionadded is needed (there's one at the module-level).

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