Polymorphism in Python via abstraction

Question

I'm trying to achieve polymorphism in python via abstraction. Here's my code:

class Animal:
    def talk(self):
        print('Hello')

class Dog(Animal):
    def talk(self):
        print('Bark')

class Cat(Animal):
    def talk(self):
        print('meow')

myObj = Dog()
print(myObj.talk())

this achieves the purpose except when I create an object and print, I get the following output:

Bark
None

I was expecting to get just Bark. Can anyone explain to me why None is also printed?

You should call the method but not print myObj.talk()

yakhyo
– yakhyo

2021-03-24 04:16:36 +00:00
Commented Mar 24, 2021 at 4:16 — yakhyo
– yakhyo, Commented Mar 24, 2021 at 4:16

bb1 · Accepted Answer · 2021-03-25 15:59:03Z

3

None is the return value of the talk() method, since this method does not return any value explicitly. If you execute myObj.talk() (without print()) you will get Bark only.

edited Mar 25, 2021 at 15:59

answered Mar 24, 2021 at 4:14

bb1

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