Python 3.6.0类继承

Question

class Animal:
def __init__(self, name, species): 
    self.name = name
    self.species = species

    def getName(self):
        return self.name

    def getSpecies(self):
        return self.species

    def __del__(self):
        print ("This came from del method")


class Dog(Animal):
    pass
    def __init__(self, name, isBig):
        Animal.__init__(self, name, "Dog")
        self.isBig = isBig

I've been playing around with understanding Classes and Child Classes and ran into the following. When instantiating

dog = Dog("Bob", True)

and try to access the method getName() from the parent, Animal, class I get the following error:

Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
dog.getName()
AttributeError: Dog instance has no attribute 'getName'

What is preventing me from directly accessing methods of the parent class?

Answer 1

Don't forget that indentation matters in Python!

Here's what your code should look like for all the methods to be in the Animal class:

class Animal:
    def __init__(self, name, species): 
        self.name = name
        self.species = species

    def getName(self):
        return self.name

    def getSpecies(self):
        return self.species

    def __del__(self):
        print ("This came from del method")

If you miss an indentation block, Python thinks you're done with your class definition.