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

[Antoine Pitrou]

Antoine Pitrou added the comment:

But to answer your argument:

> I think this is sufficiently tricky to get right that it's worth
> adding filter() as a parallel to the existing map() API.

"Tricky to get right" is not a good criterion. The question is whether it's useful or not. Only the OP has had that need AFAIK.

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<http://bugs.python.org/issue24195>
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