Combination of pair elements within list in a list

I’m trying to obtain the combinations of each element in a list within a list. Given this case:

my_list

[[‘A’, ‘B’], [‘C’, ‘D’, ‘E’], [‘F’, ‘G’, ‘H’, ‘I’]]

The output would be:

	0	1
0	A	B
1	C	D
2	C	E
3	D	E
4	F	G
5	F	H
6	F	I
7	G	H
8	G	I
9	H	I

Or it could also be a new list instead of a DataFrame:

my_new_list

[[‘A’,’B’], [‘C’,’D’], [‘C’,’E’],[‘D’,’E’], [‘F’,’G’],[‘F’,’H’],[‘F’,’I’],[‘G’,’H’],[‘G’,’I’],[‘H’,’I’]]

Answer

This should do it. You have to flatten the result of combinations.

from itertools import combinations
x = [['A', 'B'], ['C', 'D', 'E'], ['F', 'G', 'H', 'I']]
y = [list(combinations(xx, 2)) for xx in x]
z = [list(item) for subl in y for item in subl]

z

[['A', 'B'],
 ['C', 'D'],
 ['C', 'E'],
 ['D', 'E'],
 ['F', 'G'],
 ['F', 'H'],
 ['F', 'I'],
 ['G', 'H'],
 ['G', 'I'],
 ['H', 'I']]