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

[Ethan Furman]

Ethan Furman added the comment:

The recipe will work in simple situations.

In more complex situations:

  - infinite iterator
  - really large iterator (millions of items)
  - high work load to produce next iteration

the recipe will either have a severe impact on performance or fail entirely.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24195>
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