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Edit: This is not a exact duplicate of How to get all possible combinations of a list’s elements?
This topic is about finding unique combinations while the other topic is about finding ALL combinations.
If I have a python list:
L = [1,2,3,4] what's the best way to get all the possible unique combinations of 3 elements from the list like below:
["1,2,3", "1,2,4", "2,3,4", "3,4,1"] The order of the elements in the combinations doesn't matter. For example, "1,2,3" and "3,2,1" will be considered the same combination.
I can probably write a few loops to do this but I think there might be a one-liner which can do the same.
520
The unique combination of two lists in Python can be formed by pairing each element of the first list with the elements of the second list. Method 1 : Using permutation() of itertools package and zip() function. Approach : Import itertools package and initialize list_1 and list_2.
A. To create combinations without using itertools, iterate the list one by one and fix the first element of the list and make combinations with the remaining list. Similarly, iterate with all the list elements one by one by recursion of the remaining list.
You need itertools.combinations:
>>> from itertools import combinations >>> L = [1, 2, 3, 4] >>> [",".join(map(str, comb)) for comb in combinations(L, 3)] ['1,2,3', '1,2,4', '1,3,4', '2,3,4'] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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