Python nested looping Idiom

Question

I often find myself doing this:

for x in range(x_size):
    for y in range(y_size):
        for z in range(z_size):
            pass # do something here
         


        

Answer 1

Use itertools.product():

import itertools
for x, y, z in itertools.product(range(x_size), range(y_size), range(z_size)):
    pass # do something here

From the docs:

Cartesian product of input iterables.

Equivalent to nested for-loops in a generator expression.
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