Question

I want something like the code below, but in a "Pythonic" style or using the standard library:

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

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