Double Iteration in List Comprehension

doubleiter2.py

>>> result = []
... for x in seq_x:
...     for y in seq_y:
...         result.append((x,y))
>>> result
2: [(1, 'a'),
 (1, 'b'),
 (1, 'c'),
 (2, 'a'),
 (2, 'b'),
 (2, 'c'),
 (3, 'a'),
 (3, 'b'),
 (3, 'c'),
 (4, 'a'),
 (4, 'b'),
 (4, 'c')]