[issue9212] dict_keys purports to implement the Set ABC, but is missing the isdisjoint method

[Daniel Stutzbach]

Changes by Daniel Stutzbach <daniel at stutzbachenterprises.com>:


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stage: patch review -> committed/rejected
status: open -> closed
versions:  -Python 2.7, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9212>
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