Python Constructor Chaining and Polymorphism [duplicate]

Question

I'm trying to learn Python's OOP standards, I've written a very simple code

class Human(object):
    def __init__(self):
        print("Hi this is Human Constructor")

    def whoAmI(self):
        print("I am Human")


class Man(Human):
    def __init__(self):
        print("Hi this is Man Constructor")

    def whoAmI(self):
        print("I am Man")


class Woman(Human):
    def __init__(self):
        print("Hi this is Woman Constructor")

    def whoAmI(self):
        print("I am Woman")

Seems pretty simple eh? Classic inheritance module of man and woman, what i can't understand is that when i create an object for woman or man why doesn't the constructor chaining occurs, and how one could possibly achieve polymorphism in Python.

This seems like a real vague and noob line of questioning, but i'm unable to put it any other way. Any help will be appreciated

Answer 1

You have a __init__() for Man as well as Woman , so that overrides the __init__() from the parent class Human . If you want the __init__() for child class to call the parent's __init__() , then you need to call it using super(). Example -

class Man(Human):
    def __init__(self):
        super(Man, self).__init__()
        print("Hi this is Man Constructor")

class Woman(Human):
    def __init__(self):
        super(Woman, self).__init__()
        print("Hi this is Woman Constructor")

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For Python 3.x , you can simply call the parent's __init__() using - super().__init__() .