All possible variants of zip in Python

Question

For example, I have a code looks like this:

a = [1, 2]
b = [4, 5]

How can I get something like this:

[(1,4), (1,5), (2,4), (2,5         


        

Answer 1

Don't overlook the obvious:

out = []
for a in [1, 2]:
    for b in [4, 5]:
        out.append((a, b))

or list comprehensions:

a = [1, 2]
b = [4, 5]
out = [(x, y) for x in a for y in b]

Both produce out == [(1, 4), (1, 5), (2, 4), (2, 5)]