Modulo: Python vs C++

[havogt]

-1 % 2 == -1 in C++, but -1 % 2 == 1 in Python.

In gt4py.next we get different result for C++ and Python backends.

• check what cartesian does
• maybe just wrap in abs

[egparedes]

Just for information, math.fmod() implements the same behavior as C/C++ and according to the documentation (https://devdocs.io/python~3.11/library/math#math.fmod) is preferred when working with floats, but the default implementation of operator.__mod__() in python works differently, so it's not so clear to me how to proceed for the embedded backends.