How to get the length of an itertools.product?

Question

I am using itertools to run a numerical simulation iterating over all possible combinations of my input parameters. In the example below, I have two parameters and

Answer 1

Alternative solution I used:

import itertools

param = (('a', 'b'), (1, 2)) # a list of lists

# Calculate all combinations
combinations = itertools.product(*param)

# Calculate number of combinations
total_combinations = 1
for i in param:
    total_combinations = total_combinations * len(i)