How do I add together integers in a list (sum a list of numbers) in python?

by 
x = [2, 4, 7, 12, 3]
sum_of_all_numbers= sum(x)

or you can try this:

x = [2, 4, 7, 12, 3] 
sum_of_all_numbers= reduce(lambda q,p: p+q, x)

Reduce is a way to perform a function cumulatively on every element of a list. It can perform any function, so if you define your own modulus function, it will repeatedly perform that function on each element of the list. In order to avoid defining an entire function for performing p+q, you can instead use a lambda function.

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