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Mon Feb 8 13:00:59 EST 2016 · https://mail.python.org/pipermail/python-dev/2016-February/143165.html

On Mon, Feb 8, 2016 at 8:24 AM Ben Hoyt <benhoyt at gmail.com> wrote:

> Hi folks,
>
> Just a suggestion for a documentation tweak. Currently the docs for len()
> on a set say this:
>
>    .. describe:: len(s)
>
>       Return the cardinality of set *s*.
>
> I'm a relatively seasoned programmer, but I don't really have a maths
> background, and I didn't know what "cardinality" meant. I could kind of
> grok it by context, but could we change this to something like the
> following?
>
>    .. describe:: len(s)
>
>       Return the number of elements in set *s* (cardinality of *s*).
>
>
Agreed. Done. :)

-gps
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[Python-Dev] Improving docs for len() of set