Daniel Voigt Godoy - Deep Learning with PyTorch Step-by-Step A Beginner’s Guide-leanpub

bark(rex)
Output
Rex barks: "Woof!"
But that’s not what we want. We want our dogs to be able to bark out of the
box! So we will use setattr to give dogs the ability to bark. There is one
thing we need to change, though, and that’s the function’s argument. Since
we want the bark function to be a method of the Dog class itself, the
argument needs to be the method’s own instance: self.
def bark(self):
print('{} barks: "Woof!"'.format(self.name))
setattr(Dog, 'bark', bark)
Does it work? Let’s create a new dog:
fido = Dog('Fido')
fido.bark()
Output
Fido barks: "Woof!"
Of course it works! Not only new dogs can bark now, but all dogs can bark:
rex.bark()
Output
Rex barks: "Woof!"
186 | Chapter 2.1: Going Classy