[issue19362] Documentation for len() fails to mention that it works on sets

[Terry J. Reedy]

Terry J. Reedy added the comment:

I would prefer 'collections with a known size' but 'collections' should be good enough for the doc string. The manual can follow with examples.

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nosy: +terry.reedy

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19362>
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