How to loop through sums of elements line by line?

Question

Python

There is some 3x3 array (although it can be of any size). It is necessary to calculate the sums of elements in rows, for example:
1 2 3
4 5 6
7 8 9
summ1 = 1 + 5 + 9 (i.e. 1 element is skipped in the second row and the first and second in the third)
summ2 = 1 + 6 + 8
summ3 = 2 + 4 + 9
summ4 = 2 + 6 + 7
...
Is there a function to do this? Well, or push the idea of ​​\u200b\u200bhow to do it yourself.

Answer 1

Use itertools.permutations to generate all permutations. Go through them in a cycle.