ex42.py LPTHW No out put

Question

Respected Expert coders, Hello! I am absolutely new in the world of coding. I have started to learn python.I am using ZED Shah's LPTHW. For the first time I am stuck in the class section. I am attaching my code for rectification, please help me. The code is not giving any out put, simply back to prompt.

Animal is-a object

class Animal(object):
pass

class Dog(Animal):
def __init__(self, name):

    self.name = name

class Cat(Animal):    
def __init__(self, name):

    self.name = name

class Person(object):
def __init__(self, name):
    self.name = name
    self.pet = None

class Employee(Person):
def __init__(self, name, salary):
    ## ?? hmm what is this strange magic?
    super(Employee, self).__init__(name)
    ## ??
    self.salary = salary

class Fish(object):
pass

class Salmon(Fish):
pass

class Halibut(Fish):
pass

rover is- a Dog

rover = Dog("Rover")
satan = Cat("Satan")
mary = Person("Mary")
mary.pet = satan
frank = Employee("Frank", 120000)
frank.pet = rover
flipper = Fish()
crouse = Salmon()
harry = Halibut()                      

Answer 1

我刚刚完成了这个练习，所有Zed想要的是让你熟悉“is-a”和“has-a”的短语。区分类，对象和变量。代码本身没有其他目的，只是为了您的利益而进行的练习。