Question

I am hoping someone can help me with a problem I’m stuck with. I have a large number of tuples (>500) that look like this:

(2,1,3,6)  
(1,2,5,5)  
(3,0,1,6)  
(10,1,1,4)  
(0,3,3,0)  

A snippet of my code reads:

sum1 = (A,B,C,D) # creates a tuple of sums of (A,B,C,D)  
mysum = map(sum, zip(A, B, C, D))
print(mysum)

I realize the above code is not correct. I am trying to find a way to add all the values A together, all the values of B together, all the values of C together, and all the values of D together using the zip function. For example, I would like to print something that looks like this:

Asum = 16  
Bsum = 7  
Csum = 13  
Dsum = 21  

Can anyone help please? Thanks very much for your time.

Answer 1

>>> zip((1,2,3),(10,20,30),(100,200,300))
[(1, 10, 100), (2, 20, 200), (3, 30, 300)]

>>> [sum(x) for x in zip((1,2,3),(10,20,30),(100,200,300))]
[111, 222, 333]

To do this with an arbitrarily large set of tuples:

>>> myTuples = [(1,2,3), (10,20,30), (100,200,300)]
>>> [sum(x) for x in zip(*myTuples)]
[111, 222, 333]

sidenote: in python3, note that zip returns a lazy iterable, which you can always explicitly turn into a list like any other kind of iterable: list(zip(…))

_{(thanks to Seganku for catching mistake in examples in an edit which was thrice rejected by other editors)}