Python multiple inheritance, initializing from a common subclass

Question

How can I make a common subclass initialize all parent classes it's inheriting from?

class Mom(object):
 def __init__(self):
 print("Mom")
class Dad(object):
 def __init__(self):
 print("Dad")
class Child(Mom, Dad):
 def __init__(self):
 super(Child, self).__init__()
c = Child() #only prints Mom

• Sergius: This task really doesn't make any sense. Of course, you can call in all inheritance sequence, but still - why you need that?

Answer 1

They are missing the super() calls in the Mom and Dad classes that are required for co-operative subclassing to work.

class Mom(object):
 def __init__(self):
 super(Mom, self).__init__()
 print("Mom")
class Dad(object):
 def __init__(self):
 super(Dad, self).__init__()
 print("Dad")
class Child(Dad, Mom):
 def __init__(self):
 super(Child, self).__init__()
c = Child() # Mom, Dad

Answer 2

You need to call super in Mom's __init__ as well.

• Constantin: Does Dad allow that though?