combinations of a list

Question

I'm trying to get all the combinations of my list, but everytime two elements need to be removed, how do i remove those elements?

I tried to make a for loop two times and every time its removes two elements, but at the end it does not restore the list

indexes = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

for een in indexes:
    for twee in indexes:
        temp = indexes
        if een == twee:
            pass
        else:
            if een in temp:
                temp.remove(een)
            temp.remove(twee)

            print(temp)
        temp = indexes

i expected to output every time a list of length of 9 but the list keeps getting shorter. the output i got was:

[2, 3, 4, 5, 6, 7, 8, 9, 10]
[2, 3, 5, 6, 7, 8, 9, 10]
[2, 3, 5, 7, 8, 9, 10]
[2, 3, 5, 7, 9, 10]
[2, 3, 5, 7, 9]
[5, 7, 9]
[5, 9]

the first list is correct, but on the next one, the 1 does not return to the list. what am i doing wrong? Also after this one is done een should equal to 1 and do it all over again, after that een should equal to 2..... this should be the output

[2, 3, 4, 5, 6, 7, 8, 9, 10]
[1, 3, 4, 5, 6, 7, 8, 9, 10]
[1, 2, 4, 5, 6, 7, 8, 9, 10]
[1, 2, 3, 5, 6, 7, 8, 9, 10]
[1, 2, 3, 4, 6, 7, 8, 9, 10]
[1, 2, 3, 4, 5, 7, 8, 9, 10]
[1, 2, 3, 4, 5, 6, 8, 9, 10]
[1, 2, 3, 4, 5, 6, 7, 9, 10]
[1, 2, 3, 4, 5, 6, 7, 8, 10]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
[2, 3, 4, 5, 6, 7, 8, 9, 10]
[0, 3, 4, 5, 6, 7, 8, 9, 10]
[0, 2, 4, 5, 6, 7, 8, 9, 10]
[0, 2, 3, 5, 6, 7, 8, 9, 10]
[0, 2, 3, 4, 6, 7, 8, 9, 10]
[0, 2, 3, 4, 5, 7, 8, 9, 10]
[0, 2, 3, 4, 5, 6, 8, 9, 10]
[0, 2, 3, 4, 5, 6, 7, 9, 10]
[0, 2, 3, 4, 5, 6, 7, 8, 10]
[0, 2, 3, 4, 5, 6, 7, 8, 9]
[1, 3, 4, 5, 6, 7, 8, 9, 10]
[0, 3, 4, 5, 6, 7, 8, 9, 10]
[0, 1, 4, 5, 6, 7, 8, 9, 10]

and should go one untill every combination is reached

`temp = indexes` **does not** create a new list, see https://stackoverflow.com/q/2612802/3001761 — jonrsharpe, Jan 08 '19 at 22:10
i expect [2,3,4,5,6,7,8,9,10], [1,3,4,5,6,7,8,9,10], [1,2,4,5,6,7,8,9,10], [1,2,3,5,6,7,8,9,10], [1,2,3,4,6,7,8,9,10] etc.and when this is done it should go on to the next one [2,3,4,5,6,7,8,9,10], [0,3,4,5,6,7,8,9,10], [0,2,4,5,6,7,8,9,10]etc — Samuelvde, Jan 08 '19 at 22:12
@Samuelvde: Replace `temp = indexes` by `temp = indexes[:]` and you are good to go — Sheldore, Jan 08 '19 at 22:12
`but everytime two elements need to be removed`, which elements? How are we supposed to know? — yatu, Jan 08 '19 at 22:15
sorry, that i can't explain it really well. every combination that exist need to be removed — Samuelvde, Jan 08 '19 at 22:16

score 1 · Answer 1 · edited Jan 08 '19 at 22:23

1

Replace temp = indexes by temp = indexes[:]

edited Jan 08 '19 at 22:23

yatu

80,714
11
64
111

answered Jan 08 '19 at 22:19

Samuelvde

19
2

combinations of a list

1 Answers1