Adding list elements via sum in python doesn't work, why?

Question

Python

Good afternoon!

Code:
list = [1, 2, 3, 4]
sum(list)

Throws an error:
TypeError Traceback (most recent call last)
in ()
12
13 list = [1, 2, 3, 4]
---> 14 sum (list)

TypeError: 'int' object is not callable

What could be the problem, like sum is applied to lists or not?

Answer 1

Somewhere above you overridden the value of the "sum" built-in function to a number ( sum=0).
Do not use the names of built-in functions for your own variables (sum, list).

Answer 2

most likely somewhere earlier in the code the sum variable, which contains int, is redefined, the code is working