[issue11733] Implement a `Counter.elements_count` method

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

It would be interesting to have Counter.elements_count() if it has a complexity of O(1): if the collections maintains a total (in a private attribute).

Otherwise, I think that sum(c.values()) is enough and can be documented as an example in the Counter doc.

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nosy: +haypo

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<http://bugs.python.org/issue11733>
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