[New-bugs-announce] [issue43899] separate builtin function

David Alvarez Lombardi report at bugs.python.org
Tue Apr 20 17:47:05 EDT 2021

New submission from David Alvarez Lombardi <alvarezdqal at gmail.com>:

I frequently find myself doing the following for lists, sets, and dicts.

passes = [x for x in seq if cond(x)]
fails = [x for x in seq if not cond(x)]

The proposed function would behave similarly to `filter`, but it would return a tuple of the passes iterable and fails iterable rather than just the passes.

my_list = [-3, -2, -1, 0, 1, 2, 3]
def is_positive(n):
    return n > 0

positives, negatives = separate(function=is_positive, iterable=my_list)

messages: 391479
nosy: alvarezdqal
priority: normal
severity: normal
status: open
title: separate builtin function
type: enhancement
versions: Python 3.10

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