Parallelizing four nested loops in Python

Question

I have a fairly straightforward nested for loop that iterates over four arrays:

for a in a_grid:
    for b in b_grid:
        for c in c_grid:
            fo         


        

Answer 1

If you use a tool that makes it easy to parallelize two nested loops, but not four, you can use itertools.product to reduce four nested for loops into two:

from itertools import product

for a, b in product(a_grid, b_grid):
    for c, d in product(c_grid, d_grid):
        do_some_stuff(a, b, c, d)