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:

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