[issue2138] Add a factorial function

[Ilan Schnell]

Ilan Schnell <ilanschnell at gmail.com> added the comment:

The factorial function is most likely to be used in context with other
combinatorial functions (like binomial coefficients) for these functions
an external module seems most appropriate.  Most likely people would
use a factorial function only for some small toy calculation, for those
cases one can always roll a factorial function oneself.  Python should
therefore not be cluttered with this function.  I discussed this with
several developers at PyCon08, and have therefore decided to close the
discussion for now.

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components: +Library (Lib) -Interpreter Core
nosy: +ilan
priority:  -> normal
resolution:  -> rejected
status: open -> closed
title: Factorial -> Add a factorial function

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