How to get the summation of each of the 2 elements?-CodePudding

For example the list is:

stuff = [1, 2, 5, 7]

Now I created a new list named sum_list to store the summation of each of the 2 elements in stuff. The element in the sum_list will be 1 2, 1 5, 1 7, 2 5, 2 7, 5 7:

[3, 6, 8, 7, 9, 12]

CodePudding user response：

You can do this in one hideous list comprehension:

[a   b for i, a in enumerate(my_list, start=1) for b in my_list[i:]]

Nested loops may be clearer:

result = []
for i, a in enumerate(my_list, start=1):
    for b in my_list[i:]:
        result.append(a   b)

CodePudding user response：

Use itertools.combinations to get all the combinations of 2 elements, and sum to sum them:

>>> stuff = [1, 2, 5, 7]
>>> from itertools import combinations
>>> [sum(c) for c in combinations(stuff, 2)]
[3, 6, 8, 7, 9, 12]