Scope of length of a given list

Question

I'm learning about scopes of python variables: global, local, nonlocal, and built-in. And I'm having trouble with identifying the scope of following variable(var_5) in each line (1,2,3 7 4).

list = [1,2,3,4,5]
var_5 = len(list) - - - - - -(1)
print("var_1: ", val_5) - - -(2)

def len(list_a):
   return list_a
var_5= len(list)  - - - - - - (3)
print("var_1: ", val_5) - - - (4) 

Thanks in advance!