How Do You Call the Super Constructor in Python?

Invoking the Super Constructor in Python: Unraveling the Mystery

In object-oriented programming, it's commonplace to inherit from base classes to extend their functionality. In Python, invoking the super constructor, which initializes the base class, is paramount for seamless class inheritance.

While in other languages the super constructor is invoked implicitly, Python requires explicit invocation. Contrary to the popular expectation that super(self) would suffice, it does not. Let's explore the correct approach.

Invoking Super in Python 3

Python 3 introduces a simplified method of calling the super constructor:

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

class B(A):
    def __init__(self):
        print("hello")
        super().__init__()  # Python 3 syntax

Here, super() followed by __init__() explicitly invokes the super constructor.

Invoking Super in 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__()  # Python 2 syntax

Here, super is passed the class name B and self to reference the current instance.

Conclusion

Mastering the proper invocation of the super constructor is crucial in Python. Understanding the difference between its syntax in Python 2 and 3 ensures seamless inheritance and prevents unexpected behavior in your code.

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