How to create all possible combinations of a list which has lists inside of it?

Question

I have a list which looks like this

[['Macau', 'United Kingdom', 'India'],
 ['United States', 'China'],
 ['China', 'Australia']]

And I want to have all possible combinations of those countries but combinations need to be limited to the small lists, I dont want them to mix.

For example I want to have

[('Macau', 'India'), ('United Kingdom', 'India'), ('Macau', 'United Kingdom'), ('United States', 'China')...]

Have you tried using `itertools.combinations` or `itertools.product`? — mkrieger1, Apr 06 '22 at 20:19
Does this answer your question? [How to get all possible combinations of a list’s elements?](https://stackoverflow.com/questions/464864/how-to-get-all-possible-combinations-of-a-list-s-elements). Just do this separately for each list in your list-of-lists. — Pranav Hosangadi, Apr 06 '22 at 20:21

gremur · Accepted Answer · 2022-04-06T22:18:30.463

1

Possible solution is the following:

from itertools import combinations

lst = [['Macau', 'United Kingdom', 'India'], ['United States', 'China'],  ['China', 'Australia']]

print([list(combinations(group, 2)) for group in lst])

Returns

[[('Macau', 'United Kingdom'),
  ('Macau', 'India'),
  ('United Kingdom', 'India')],
 [('United States', 'China')],
 [('China', 'Australia')]]

edited Apr 06 '22 at 22:18

answered Apr 06 '22 at 20:25

gremur

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The case is that I dont want to have all possible combinations but to have possible combinations within each single list, I dont want to mix them all. – Axton Apr 06 '22 at 20:49
@Axton, code has been updated – gremur Apr 06 '22 at 22:18

Golden Lion · Answer 2 · 2022-04-06T21:00:48.533

use set and itertools to find all possible combinations by groupings

import itertools

data=[['Macau', 'United Kingdom', 'India'],
 ['United States', 'China'],
 ['China', 'Australia']]

lst=[]
for item in data:
    result=list(itertools.combinations(set(item), 2))
    lst.append(result)
    #print(result)
    
print(lst)

output:

[[('United Kingdom', 'Macau'), ('United Kingdom', 'India'), ('Macau', 'India')], [('United States', 'China')], [('Australia', 'China')]]

How to create all possible combinations of a list which has lists inside of it?

2 Answers2