What happens when you use special reserved word as variable name

Question

Variable

Answer 1

[Edited] here is an example code that causes me a headache to find the problem.

print(sum(list(map(int,str(inp2)))))
TypeError: 'int' object is not callable
https://code.sololearn.com/ccnuDzMG1732/?ref=app

Answer 2

a very short sample from the console:

>>> lst = [1,2,3]
>>> sum(lst)
6
>>> sum = 0
>>> sum(lst)

TypeError: 'int' object is not callable

Answer 3

Error

Answer 4

Syntax error