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Mon Feb 8 11:49:43 EST 2016 · https://mail.python.org/pipermail/python-dev/2016-February/143155.html

On Monday, February 8, 2016 8:23 AM, Ben Hoyt <benhoyt at gmail.com> wrote:

>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*).

+{{}}

(using the normal von Neumann definitions for 0={} and Succ(n) = n U {n})

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