[issue29160] pow with three int arguments works like it had two arguments

[Case Van Horsen]

Case Van Horsen added the comment:

This is a bug/limitation in numpy. If x and y are Python integers, and type(z) is of another numeric type, pow calls the nb_power slot of the underlying type. Here a quick example using numpy.int32 and gmpy2.mpz:

>>> import numpy, gmpy2
>>> pow(11,13,7)
4
>>> pow(11,13,numpy.int32(7))
34522712143931
>>> pow(11,13,gmpy2.mpz(7))
mpz(4)


>>> (11).__pow__(13,7)
4
>>> numpy.int32(11).__pow__(13,7)
34522712143931
>>> gmpy2.mpz(11).__pow__(13,7)
mpz(4)


casevh

----------
nosy: +casevh

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29160>
_______________________________________