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class India():
def capital(self):
print("New Delhi is the capital of India.")
def language(self):
print("Hindi is the most widely spoken language of India.")
def type(self):
print("India is a developing country.")
class USA():
def capital(self):
print("Washington, D.C. is the capital of USA.")
def language(self):
print("English is the primary language of USA.")
def type(self):
print("USA is a developed country.")
obj_ind = India()
obj_usa = USA()
for country in (obj_ind, obj_usa):
country.capital()
country.language()
country.type()
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class Parrot:
def fly(self):
print("Parrot can fly")
def swim(self):
print("Parrot can't swim")
class Penguin:
def fly(self):
print("Penguin can't fly")
def swim(self):
print("Penguin can swim")
# common interface
def flying_test(bird):
bird.fly()
#instantiate objects
blu = Parrot()
peggy = Penguin()
# passing the object
flying_test(blu)
flying_test(peggy)
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class Animal:
def sound(self):
pass
class Dog(Animal):
def sound(self):
return 'Woof!'
class Cat(Animal):
def sound(self):
return 'Meow!'
# Polymorphism in action
animals = [Dog(), Cat()]
for animal in animals:
print(animal.sound())
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# Python program to demonstrate in-built poly-
# morphic functions
# len() being used for a string
print(len("geeks"))
# len() being used for a list
print(len([10, 20, 30]))