The pythonic way to generate pairs

Question

I want something like code below, but \"pythonic\" style or using standard library:

def combinations(a,b):
    for i in a:
        for j in b:
             y         


        

Answer 1

These are not really "combinations" in the sense of combinatorics, these are rather elements from the cartesian product of a and b. The function in the standard library to generate these pairs is itertools.product():

for i, j in itertools.product(a, b):
    # whatever