Performant cartesian product (CROSS JOIN) with pandas

Question

The contents of this post were originally meant to be a part of Pandas Merging 101, but due to the nature and size of the content required to fully do j

Answer 1

Using itertools product and recreate the value in dataframe

import itertools
l=list(itertools.product(left.values.tolist(),right.values.tolist()))
pd.DataFrame(list(map(lambda x : sum(x,[]),l)))
   0  1  2   3
0  A  1  X  20
1  A  1  Y  30
2  A  1  Z  50
3  B  2  X  20
4  B  2  Y  30
5  B  2  Z  50
6  C  3  X  20
7  C  3  Y  30
8  C  3  Z  50