[docs] [issue26374] concurrent_futures Executor.map semantics better specified in docs

Mark Dickinson report at bugs.python.org
Fri Feb 19 02:59:55 EST 2016

Mark Dickinson added the comment:

I just noticed this point, which may be confusing things:

> Rebut: order is undefined, concurrent_futures specifies map() returns an iterator, where builtin map returns a list.

In Python 3, the built-in map function returns an iterator, not a list.


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