Get all combinations of elements from two lists?

Question

If I have two lists

l1 = [ 'A', 'B' ]  l2 = [ 1, 2 ] 

what is the most elegant way to get a pandas data frame which looks like:

+-----+-----+-----+ |     | l1  | l2  | +-----+-----+-----+ |  0  | A   | 1   | +-----+-----+-----+ |  1  | A   | 2   | +-----+-----+-----+ |  2  | B   | 1   | +-----+-----+-----+ |  3  | B   | 2   | +-----+-----+-----+ 

Note, the first column is the index.

Answer 1

use product from itertools:

>>> from itertools import product >>> pd.DataFrame(list(product(l1, l2)), columns=['l1', 'l2'])   l1  l2 0  A   1 1  A   2 2  B   1 3  B   2