/
ex42.py
78 lines (56 loc) · 1.67 KB
/
ex42.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
## Animal is-a object (yes, sort of confusing) look at the extra credit
class Animal(object):
pass
## Dog is-a Animal
class Dog(Animal):
def __init__(self, name):
## self has-a attribute named name, set that to the parameter name
self.name = name
## Cat is-a Animal
class Cat(Animal):
def __init__(self, name):
## self has-a attribute named name, set that to the parameter name
self.name = name
## Person is-a object
class Person(object):
def __init__(self, name):
## self has-a attribute named name, set that to the parameter name
self.name = name
## Person has-a pet of some kind
self.pet = None
## Employe is-a Person
class Employee(Person):
def __init__(self, name, salary):
## fancy way of calling this __init__. the superclass has-a Employee
## (and self); it also has-a __init__, and call that. also a zillion
## times less messy in Python 3
super(Employee, self).__init__(name)
## self has-a salary, set it to salary
self.salary = salary
## Fish is-a object
class Fish(object):
pass
## Salmon is-a Fish
class Salmon(Fish):
pass
## Halibut is-a Fish
class Halibut(Fish):
pass
## rover is-a Dog
rover = Dog("Rover")
## satan is-a Cat (well, duh)
satan = Cat("Satan")
## mary is-a Person
mary = Person("Mary")
## mary has-a pet, set to satan
mary.pet = satan
## frank is-a Employee with parameters Frank and 120000
frank = Employee("Frank", 120000)
## frank has-a pet
frank.pet = rover
## flipper is-a Fish, which, sigh...
flipper = Fish()
## crouse is-a Salmon
crouse = Salmon()
## harry is-a Halibut, and likes alliteration
harry = Halibut()