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

This task really doesn't make any sense. Of course, you can call in all inheritance sequence, but still - why you need that? — Sergius
– Sergius, Commented Feb 14, 2017 at 14:58

ᴀʀᴍᴀɴ · Accepted Answer · 2017-02-14 14:58:10Z

5

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

answered Feb 14, 2017 at 14:58

ᴀʀᴍᴀɴ

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Comments

Daniel Roseman · Accepted Answer · 2017-02-14 14:56:09Z

4

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

answered Feb 14, 2017 at 14:56

Daniel Roseman

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1 Comment

Constantin Over a year ago

Does Dad allow that though?

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