New submission from Amit Saha:
The description of the symmetric difference operation implies that it cannot be
applied to more than two sets
(http://docs.python.org/3/library/stdtypes.html#set.symmetric_difference).
However, this is certainly possible:
>>> s={1,2}
>>> t={2,3}
>>> u={3,4}
>>> s^t^u
{1, 4}
>>> s.symmetric_difference(t).symmetric_difference(u)
{1, 4}
I am not sure how much of a "semantic" sense that makes, given that symmetric
difference is by definition for two sets.
(http://en.wikipedia.org/wiki/Symmetric_difference).
So, either the operator should be fixed to allow only two sets or the
description be updated.
----------
assignee: docs@python
components: Documentation
messages: 187899
nosy: Amit.Saha, docs@python
priority: normal
severity: normal
status: open
title: symmetric difference operation applicable to more than two sets
type: behavior
versions: Python 3.3
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Python tracker <[email protected]>
<http://bugs.python.org/issue17854>
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