Calling superclass constructors in python with different arguments

Question

class A():
    def __init__( self, x, y):
        self.x = x
        self.y = y

class B():
    def __init__( self, z=0):
        self.z = z  

class AB(A,B):
    de         


        

Answer 1

You didn't pass self.

class AB(A, B):
    def __init__(self, x, y, z=0):
        A.__init__(self, x, y)
        B.__init__(self, z)

Note that if this inheritance hierarchy gets more complicated, you'll run into problems with constructors not executing or getting reexecuted. Look into super (and the problems with super), and don't forget to inherit from object if you're on 2.x and your class doesn't inherit from anything else.