[issue24195] Add `Executor.filter` to concurrent.futures

[Ram Rachum]

Ram Rachum added the comment:

Patch with documentation attached. (I don't know how to concatenate patches, so 2.patch contains only the documentation, while 1.patch has the implementation and the tests (but Ethan's patch is better.))

Brian, regarding your simpler implementation based on `Executor.map`: It looks good to me, but I'm not sure if it passes the tests. If it does then I don't mind if that's the implementation that would be used.

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Added file: http://bugs.python.org/file39381/2.patch

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