42. Product of lists

Here’s how to get the product of elements in multiple lists.

42.1. Don’t do this

 1a = ['cat', 'dog', 'frog']
 2b = ['red', 'green', 'blue']
 3c = ['big', 'small']
 4
 5product_list = []
 6for animal in a:
 7    for color in b:
 8        for size in c:
 9            tup = animal, color, size
10            product_list.append(tup)

42.2. Do this

1from itertools import product
2
3a = ['cat', 'dog', 'frog']
4b = ['red', 'green', 'blue']
5c = ['big', 'small']
6
7product_list = product(a, b, c)
1from itertools import product
2
3a = ['cat', 'dog', 'frog']
4b = ['red', 'green', 'blue']
5c = ['big', 'small']
6
7list_of_list = [a, b, c]
8product_list = product(*list_of_list)