python - Permutations of a list of lists

Question

I have a list like this:

l = [['a', 'b', 'c'], ['a', 'b'], ['g', 'h', 'r', 'w']]

I want to pick an element from each list and combine them to be a string.

For example: 'aag', 'aah', 'aar', 'aaw', 'abg', 'abh' ....

However, the length of the list l and the length of each inner list are all unknown before the program is running. So how can I do want I want?

Answer 1

Take a previous solution and use itertools.product(*l) instead.