built-in pow() vs. math.pow()

[Barry Scott]

> On 30 Mar 2023, at 18:11, Barry Scott <barry at barrys-emacs.org> wrote:
> 
> 
> 
>> On 30 Mar 2023, at 10:15, Andreas Eisele <andreas.eisele at gmail.com> wrote:
>> 
>> I sometimes make use of the fact that the built-in pow() function has an optional third argument for modulo calculation, which is handy when dealing with tasks from number theory, very large numbers, problems from Project Euler, etc. I was unpleasantly surprised that math.pow() does not have this feature, hence "from math import *" overwrites the built-in pow() function with a function that lacks functionality. I am wondering for the rationale of this. Does math.pow() do anything that the built-in version can not do, and if not, why is it even there?
> 
> Maybe math.pow() aways using IEEE 754(?) float point via the C runtime math routines.
> pow() will give int answer if called with int args.

And the C version of pow only supports 2 arg call.

SYNOPSIS
     #include <math.h>

     double
     pow(double x, double y);

     long double
     powl(long double x, long double y);

     float
     powf(float x, float y);


> 
> Barry
> 
> 
>> Thanks in advance for any enlightening comment on this.
>> Best regards, Andreas
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