How to iterate over multiple list and calculate every alternate values in it?

Question

I have list where it has values of multiple persons, I want to calculate every alternate values in list of lists, how can I achieve it? list looks like below

for j in persons:
    person_list.append(persons[int(j)][0]+persons[int(j)][2])     
    person_list.append(persons[int(j)][1]+persons[int(j)][3])     
    print("person list", person_list)

Above is the code which I tried, but it’s not working

person [[222, 1, 255, 54], [105, 1, 135, 48], [397, 310, 521, 594]]

I have to calculate 222+255 and 1+54 and similarly for other lists.

Asked By: Madesh Prasad

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Source

Answer 1

You can do something like this:

>>> x = [[222, 1, 255, 54], [105, 1, 135, 48], [397, 310, 521, 594]]
>>> [[sum(i[::2]), sum(i[1::2])] for i in x]
[[477, 55], [240, 49], [918, 904]]

This will go over and sum the even-indexed values together and the same with the odd-indexed values.

Answered By: Hampus Larsson

How to iterate over multiple list and calculate every alternate values in it?

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