Illustrates duck typing in the simplest way

duck_typing.py

class Duck:
    def quack(self):
        print("Quacked")

class AnotherDuck:
    def quack(self):
        print("Louder Quack")

class Eagle:
    def fly(self):
        print("Dude i just fly")

class MakeItQuack:
    def __init__(self, bird):
        bird.quack()

MakeItQuack(Duck())
MakeItQuack(AnotherDuck())
MakeItQuack(Eagle())