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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Titles that fit in the box, like 'Dict.keys lacks .isjoint method.' are easier to read and keep track of.

Unless there is a reason I have missed, I would iterate through the smaller set, which might even be empty or nearly so, rather than either in particular.

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nosy: +tjreedy

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<http://bugs.python.org/issue9212>
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