New submission from David Miguel Susano Pinto <carandraug+...@gmail.com>:
set union, intersection, difference methods accept any non-zero number of sets
and return a new set instance, like so:
>>> a = set([1, 2])
>>> b = set([1, 3])
>>> c = set([3, 5])
>>> set.union(a, b, c)
{1, 2, 3, 5}
even if it's only one argument:
>>> set.union(a)
{1, 2}
I think it would be nice if zero arguments were not an error:
>>> set.union()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: descriptor 'union' of 'set' object needs an argument
This would allow to handle any sequence of sets which otherwise requires this:
if len(sequence):
return set.union(*sequence)
else:
return set()
----------
messages: 330601
nosy: carandraug
priority: normal
severity: normal
status: open
title: set union/intersection/difference could accept zero arguments
type: enhancement
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35338>
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