很简单; 初级班

Question

New to python and currently learning about classes and OOP. I'm trying to get the following simple piece of code to run but can't figure out why I'm getting an error. Please see code below:

class Animal(object):
    fur = True
    def real_animal(self):
        if fur:
            print "Real animal"
        else:
            print "Fake animal"

class Dog(Animal):
    fur = True
    def __init__(self, name): 
        self.name = name

rover = Dog("Rover")
rover.real_animal()

I get an error stating fur is not defined. From my understanding, classes can inherit from classes. So, since Rover is-a instance of class Dog, which is a class Animal. Shouldn't I be able to run functions of base class Animal on Rover? I basically want to state dogs have fur and therefore are real animals.

Thanks all for helping a newbie.

Answer 1

You have at least two mistakes:

• You need to refer to the fur variable as self.fur , because it's not a local variable but a variable on the instance / class

• In the Dog class, you call the variable has_fur , but in the parent class it's called just fur .