使用属性覆盖 setter：TypeError: 'int' 对象不可调用

Question

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

Answer 1

Python 属性是非多态的： https : //www.artima.com/forums/flat.jsp?forum=122&thread=153649

Answer 2

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

Answer 3

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)