Christian Leichsenring <christian.leichsenr...@googlemail.com> added the 
comment:

The main point the OP didn't make is exactly the issue that Pool.map returns a 
list which is potentially very large given that multiprocessing is used to 
process large amounts of data.

So IMHO either there should be the possibility to exclude elements from being 
saved in memory (i.e. Pool.filter) or Pool.map shouldn't return a list but just 
an iterable.

----------
nosy: +christian.leichsenring

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue22864>
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