How to mix lists in python and see it in real time

Question

I tried to do something like below:

a_list = [
    range(1, 4),
    range(5, 8),
    range(11, 14),
]

I wanted a result like that:

res = ['1 5 11', '1 5 12', '1 5 13', '1 6 11', '1 6 12', '1 6 13', '1 7 11', '1 7 12', '1 7 13',
       '2 5 11', '2 5 12', '2 5 13', '2 6 11', '2 6 12', '2 6 13', '2 7 11', '2 7 12', '2 7 13',
       '3 5 11', '3 5 12', '3 5 13', '3 6 11', '3 6 12', '3 6 13', '3 7 11', '3 7 12', '3 7 13',
      ]

How can I get it

What have you tried, and what exactly is the problem with it? — jonrsharpe, Nov 10 '19 at 21:14
Does this answer your question? [Get the cartesian product of a series of lists?](https://stackoverflow.com/questions/533905/get-the-cartesian-product-of-a-series-of-lists) — Hampus Larsson, Nov 10 '19 at 21:19
Why did you just change the purpose of your post ? Also no-one will be notified of this so you don't have more or modified answers^^ — azro, Nov 11 '19 at 19:45

score 2 · Answer 1 · edited Nov 11 '19 at 00:40

What you're looking for is the Cartesian product of the sublists.

from itertools import product

a_list = [
    ['1', '2', '3'],
    ['5', '6', '7'],
    ['11', '12', '13'],
]

list(product(*a_list))

That will give you a list of tuples. If you need a list of lists instead, try:

[list(x) for x in product(*a_list)]

And finally if you want space separated strings:

[' '.join(x) for x in product(*a_list)]

score 2 · Accepted Answer · answered Nov 10 '19 at 21:19

Combining itertools.product and ' '.join you can do it

from itertools import product
# product(*a_list) [('1', '5', '11'), ('1', '5', '12'), ('1', '5', '13'), ...
prod = map(' '.join, product(*a_list)) # ['1 5 11', '1 5 12', '1 5 13', '1 6 11', ...
print(list(prod))

score 0 · Answer 3 · edited Nov 11 '19 at 17:23

import itertools
a_list = [
    ['1', '2', '3'],
    ['5', '6', '7'],
    ['11', '12', '13'],
]

b_list = [' '.join(i) for i in itertools.product(*a_list)]
print(b_list)

Result is:

['1 5 11', '1 5 12', '1 5 13', '1 6 11', '1 6 12', '1 6 13', '1 7 11', '1 7 12', '1 7 13', '2 5 11', '2 5 12', '2 5 13', '2 6 11', '2 6 12', '2 6 13', '2 7 11', '2 7 12', '2 7 13', '3 5 11', '3 5 12', '3 5 13', '3 6 11', '3 6 12', '3 6 13', '3 7 11', '3 7 12', '3 7 13']

How to mix lists in python and see it in real time

3 Answers3