[Python-ideas] Introduce `start=1` argument to `math.factorial`

[Clint Hepner]

-1 on overloading math.factorial to compute something that isn't a
factorial, but a falling factorial. Such a new function would be easy to
add, though, if deemed useful.

     math.falling_factorial(x, n) = product(range(x - n + 1, x + 1))

and the similar function

    math.rising_factorial(x, n) = product(range(x, x+n))

On Wed, Sep 17, 2014 at 7:02 PM, Ram Rachum <ram.rachum at gmail.com> wrote:

> I suggest introducing a `start=1` argument to `math.factorial`, so the
> result would be (the C-optimized version of) `product(range(start, x+1),
> start=1)`. This'll be useful for combinatorical calculations.
>
>
>
>
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