[New-bugs-announce] [issue23339] dict_values should be comparable with a set

[ThiefMaster]

New submission from ThiefMaster:

>>> d = {'1': '2'}
>>> {'1'} < d.keys()
False
>>> {'1'} < set(d.values())
False
>>> {'1'} < d.values()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unorderable types: set() < dict_values()


Same for e.g. the `-` operator.

Since dict_keys acts like a real set I think dict_values should do so, too. At least if all the values are hashable.

----------
components: Library (Lib)
messages: 234888
nosy: ThiefMaster
priority: normal
severity: normal
status: open
title: dict_values should be comparable with a set
versions: Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23339>
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