error unexpected (missundertsand inherited class in python 3)

ipython.test

In [129]: class A: 
    def __init__(self, x): 
        super().__init__(x) 
        self._x = x 
        self._a_var = "Variable A" 
    @property 
    def a_var(self, x): 
        return self._a_var
        
class B: 
    def __init__(self, x): 
        super().__init__(x) 
        self._b_var = "Variable B" 
        self._x = x 
    @property 
    def b_var(self): 
        return self._b_var 

class C(B,A): 
    def __init__(self, x): 
        super().__init__(x) 
        self._c_var = "Variable_c" 
        self._x = x 

class D(C): 
    def __init__(self, x): 
        super().__init__(x) 
        self._d_var = "VARIABLE D"  
        
In [130]: test_d = D("THE X arg")                                                                                                    
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-130-f60076053a06> in <module>
----> 1 test_d = D("THE X arg")

<ipython-input-129-54ad04b6d867> in __init__(self, x)
     22 class D(C):
     23     def __init__(self, x):
---> 24         super().__init__(x)
     25         self._d_var = "VARIABLE D"
     26 

<ipython-input-129-54ad04b6d867> in __init__(self, x)
     17 class C(B,A):
     18     def __init__(self, x):
---> 19         super().__init__(x)
     20         self._c_var = "Variable_c"
     21         self._x = x

<ipython-input-129-54ad04b6d867> in __init__(self, x)
      9 class B:
     10     def __init__(self, x):
---> 11         super().__init__(x)
     12         self._b_var = "Variable B"
     13         self._x = x

<ipython-input-129-54ad04b6d867> in __init__(self, x)
      1 class A:
      2     def __init__(self, x):
----> 3         super().__init__(x)
      4         self._x = x
      5         self._a_var = "Variable A"

TypeError: object.__init__() takes exactly one argument (the instance to initialize)