[docs] [issue32306] Clarify map API in concurrent.futures

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I see.  So the problem you are pointing out is that the tasks *arguments* are consumed eagerly.  I agree that may be a problem in some cases, though I think in most cases people are concerned with the *results*.

(note that multiprocessing.Pool() has an imap() method which does what you would like)

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<https://bugs.python.org/issue32306>
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