How change numbers from a list to another one at a certain position?

Question

There 2 lists with 20 elements each

I want to change the first element of list A with 20º of list B, the 2º element of list A with 19º of list B, and so forth until change the 20º element of list A with 1º of list B.

Answer 1

If I get you right, you want to swap the first element of the list A with the last element of list B, then the second element of list A with second last of list B, Then:

l = len(listA)

for i in range(0, l):

    listA[i], listB[(l - 1) - i] = listB[(l - 1) - i], listA[i]

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