How can I find all the possible combinations of a list of lists (in Python)?

Question

I have the following structure in Python:

letters = [[\'a\', \'b\', \'c\'], [\'p\', \'q\', \'r\', \'s\'], [\'j\', \'k\', \'l\']]

I would like t

Answer 1

In Python 2.6 or newer you can use itertools.product:

>>> import itertools
>>> map(''.join, itertools.product(*letters))
apj
apk
apl
aqj
aqk
aql
...etc...
csk
csl