Subtract values in one list from corresponding values in another list

Question

I have two lists:

A = [2, 4, 6, 8, 10]
B = [1, 3, 5, 7, 9]

How do I subtract each value in one list from the corresponding value in the oth

Answer 1

The easiest way is to use a list comprehension

C = [a - b for a, b in zip(A, B)]

or map():

from operator import sub
C = map(sub, A, B)

Answer 2

Perhaps this could be usefull.

C = []
for i in range(len(A)):
    difference = A[i] - B[i]
    C.append(difference)

Answer 3

Since you appear to be an engineering student, you'll probably want to get familiar with numpy. If you've got it installed, you can do

>>> import numpy as np
>>> a = np.array([2,4,6,8])
>>> b = np.array([1,3,5,7])
>>> c = a-b
>>> print c
[1 1 1 1]