Polymorphism

 Polymorphism:

  • Means to have many forms

It means changing the objects at the run time.

class Dog(Animal):
#All methods and attributes of Animal are inherited and it has it's own characteristics as well.


class Bird(Animal):
#All methods and attributes of Animal are inherited and it has it's own characteristics as well.

class Lion(Animal):
#All methods and attributes of Animal are inherited and it has it's own characteristics as well.


usage example:

zoo: Animal = []

dog = Dog()
zoo.append(dog) -> it will work as dog is child of Animal

dog = Animal() -> it will also work as dog is type of Animal.
dog2 = Dog()
bird = Bird()
lion = Lion()

zoo.append(bird)
zoo.append(dog2)
zoo.append(lion)


Now overriding the method in child class:

class Animal:
    def talk(self):
        print("Does not make a sound")

class Dog(Animal):
    def talk(self):
        print("Bark!")

class Bird(Animal):
    def talk(self):
        print("Chirp!")

class Lion(Animal):
    def talk(self):
        print("Roar!")

Verification:
for animal in zoo:
    animal.talk()

Implementing polymorphism in our small game code:

  • Create new battle function within our main.py file
    • Uses our enemy talk() and attack() methods

Code example:
# using implementation
from Enemy import Enemy
from Zombie import Zombie
from Ogre import Orge


def battle(e: Enemy): # We are passing parent object as parameter
    e.talk()
    e.attack()

zombie=Zombie(healthPoints=15, attack_damage=3)

"""
# This will call the getter method for typeOfEnemy
print(f"Enemy type = {zombie.get_typeOfEnemy()}")

# This will call the talk method from the Zombie class
print(f"{zombie.talk()}")

# This will call the spread_diesease method from the Zombie class
print(f"{zombie.spread_diesease()}")
"""

ogre=Orge(healthPoints=25, attack_damage=7)

"""
# This will call the getter method for typeOfEnemy
print(f"Enemy type = {ogre.get_typeOfEnemy()}")

# This will call the talk method from the Ogre class
print(f"{ogre.talk()}")
"""

battle(zombie)
battle(ogre)


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