How to Invoke the Super Constructor in Python?

Invoking the Super Constructor in Python

Unlike other programming languages, Python does not implicitly invoke the super constructor. This raises the question of how to explicitly invoke the super constructor in Python.

Python 3

To invoke the super constructor in Python 3, simply use the super().__init__() syntax within the subclass constructor:

class A(object):
    def __init__(self):
        print("world")

class B(A):
    def __init__(self):
        print("hello")
        super().__init__()

Python 2

In Python 2, a slightly more verbose syntax is required:

class A(object):
    def __init__(self):
        print "world"

class B(A):
    def __init__(self):
        print "hello"
        super(B, self).__init__()

This super(B, self) syntax is equivalent to super() in Python 3. Remember to include the object base class to explicitly specify that your classes are old-style classes.

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