TypeError: 'xxx' is not callable 은 함수가 아닌 것을 함수호출처럼 썼을 때, ( 즉, 바로 뒤에 () 가 있을 때 ) 발생합니다.

예를 보여드릴께요.

>>> a = 1
>>> a()
Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    a()
TypeError: 'int' object is not callable

>>> b = "abc"
>>> b(3, 4)
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    b(3, 4)
TypeError: 'str' object is not callable


>>> c = range(32)
>>> c(33, "a")
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    c(33, "a")
TypeError: 'range' object is not callable