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

>>>a=[1,2,3]
>>>b=[4,5,6]
>>>zip(a,b)
[(1, 4), (2, 5), (3, 6)]