CODEWITHSUNDEEP
pythonooppropertiesgetter-settersuper
Valentin Fabianski
Valentin Fabianski

Reputation: 706

Override setter with property: TypeError: 'int' object is not callable

I am getting the following error:

Traceback (most recent call last):
  File ".../TEST.py", line 34, in <module>
    b.level = 12    # Error
  File ".../TEST.py", line 23, in level
    super().level(self, new_level)
TypeError: 'int' object is not callable

And here is the code:

class A:
    def __init__(self):
        self._level = 0

    @property
    def level(self):
        return self._level

    @level.setter
    def level(self, new_level):
        self._level = new_level

class B(A):
    def __init__(self):
        super().__init__()

    @property
    def level(self):
        return self._level

    @level.setter
    def level(self, new_level):
        super().level(self, new_level)



a = A()
print(a.level)  # --> 0
a.level = 12
print(a.level)  # --> 0

b = B()
print(b.level)  # --> 12
b.level = 12    # Error
print(b.level)  # never reached

I saw that post class method TypeError "Int object not callable" but it did not help me

Upvotes: 0

Views: 670

Answers (3)

Valentin Fabianski
Valentin Fabianski

Reputation: 706

Another answer seems to be the best one:

class B(A):
    @A.level.setter
    def level(self, new_level):
        super(B, type(self)).level.fset(self, new_level)

Upvotes: 0

Valentin Fabianski
Valentin Fabianski

Reputation: 706

The best I have come up is this:

  1. If there is no need to override the getter then you can prefix by parent class name

  2. No code in setter: setters only call other methods

    2.a Defined instance methods which do the setter instructions

    2.b Which are called by the setters

    class A:
    def __init__(self):
        self._level = 0

    def A_level_setter(self, new_level):      # 2.a
        print('Setter instructions of A')
        self._level = new_level

    @property
    def level(self):
        return self._level

    @level.setter
    def level(self, new_level):
        self.A_level_setter(new_level)        # 2.b

class B(A):
    def B_level_setter(self, new_level):      # 2.a
        print('Setter instructions of B')
        self.A_level_setter(new_level)

    @A.level.setter                           # 1.
    def level(self, new_level):
        self.B_level_setter(new_level)        # 2.b

class C(A):
    pass


a = A()
print(a.level)  # 0
b = B()
print(b.level)  # 0
c = C()
print(c.level)  # 0


a.level = 1     # Setter instructions of A
print(a.level)  # 1

b.level = 2     # Setter instructions of A
                # Setter instructions of B
print(b.level)  # 2

c.level = 3     # Setter instructions of A
print(c.level)  # 3

Upvotes: 0

William Afonso
William Afonso

Reputation: 96

Python properties are non-polymorphic : https://www.artima.com/forums/flat.jsp?forum=122&thread=153649

Upvotes: 1

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