How can I make an inline for loops in python to sum a list of numbers?

Question

I did this for loop and I wanted to put it in only one line.

def mean(list):
    sum = 0
    for i in list:
        sum += i
    return sum // len(list)

I tried this, but it doesn't work, it is a syntax error.

def mean(list):
    sum = 0
    sum = [sum += i for i in list]
    return sum // len(list)

question from:https://stackoverflow.com/questions/65902912/how-can-i-make-an-inline-for-loops-in-python-to-sum-a-list-of-numbers

Answer 1

A faster (and better) way will be to use built-ins:

def mean(a):
    return sum(a)/len(a)

you cannot make a sum using a inline loop unless you use fancy hacks including the := operator and list comphention.(Not recommended)

BTW,you should never use builtin names as variable names.They will make your code harder to understand,and (sometimes) slower.

Edit: If you really want the loop in one line,here's how to do it (python3.9+ needed)

def mean(a):
    s=0
    return [s:=s+i for i in a][-1]/len(a)