Is there a way to make several similar types of strings at once in Python?

import itertools

list(itertools.product('ABCD', repeat=2))
Out[34]: 
[('A', 'A'),
 ('A', 'B'),
 ('A', 'C'),
 ('A', 'D'),
 ('B', 'A'),
 ('B', 'B'),
 ('B', 'C'),
 ('B', 'D'),
 ('C', 'A'),
 ('C', 'B'),
 ('C', 'C'),
 ('C', 'D'),
 ('D', 'A'),
 ('D', 'B'),
 ('D', 'C'),
 ('D', 'D')]