why this code shows NONE in output in last line?

Question

the code is in python...
class Animal:
def __init__(self, name, color):
self.color = color
self.name = name
class cat(Animal):
def purr(self):
print("purrrrrr.......")
class dog(Animal):
def bark(self):
print("bark bark bark.....")
class rabbit(Animal):
def jump():
print("ping pong.....")
x = dog("pony", "brown")
y = cat("kitty", "white")
z = rabbit("jaggy" , "brown")
print(x.color, ' = ', x.name)

print(y.color, ' = ', y.name)

print(z.color, ' = ', z.name)
print(x.bark())

Answer 1

The `bark` method of the `dog` class does not return anything (no return statement there). When a function or method doesn't return anything you'll get None if you try to use the return value (because none is returned literally).