python学习笔记（5）—— class

　　1、空class，占空间

1 class Animal(object):
2     pass

　　2、定义__init__()空

1 class Animal(object):
2     def __init__():
3         pass

　　3、declare name

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

zebra = Animal(‘Jeffrey‘)
print zebra.name
#Jeffrey

　　4、another def

class Animal(object):
    """Makes cute animals."""
    is_alive = True
    def __init__(self, name, age):
        self.name = name
        self.age = age
    # Add your method here!
    def description(self):
        print self.name
        print self.age
hippo = Animal(‘aa‘,3).description()
#aa
#3

　　5、继承

 1 class Shape(object):
 2     """Makes shapes!"""
 3     def __init__(self, number_of_sides):
 4         self.number_of_sides = number_of_sides
 5
 6 # Add your Triangle class below!
 7 class Triangle(Shape):
 8     def __init__(self,side1,side2,side3):
 9         self.side1 = side1
10         self.side2 = side2
11         self.side3 = side3

　　6、继承.复写

 1 class Employee(object):
 2     """Models real-life employees!"""
 3     def __init__(self, employee_name):
 4         self.employee_name = employee_name
 5
 6     def calculate_wage(self, hours):
 7         self.hours = hours
 8         return hours * 20.00
 9
10 # Add your code below!
11 class PartTimeEmployee(Employee):
12     def calculate_wage(self,hours):
13         self.hours = hours
14         return 12*hours

　　7、super class

 1 class Employee(object):
 2     """Models real-life employees!"""
 3     def __init__(self, employee_name):
 4         self.employee_name = employee_name
 5
 6     def calculate_wage(self, hours):
 7         self.hours = hours
 8         return hours * 20.00
 9
10 # Add your code below!
11 class PartTimeEmployee(Employee):
12     def calculate_wage(self,hours):
13         self.hours = hours
14         return 12*hours
15     def full_time_wage(self,hours):
16         return super(PartTimeEmployee,self).calculate_wage(hours)#返回父class函数
17
18 milton = PartTimeEmployee(‘aa‘)
19 print milton.full_time_wage(10)
20 #200

Example

class Triangle(object):
    number_of_sides = 3
    def __init__(self,angle1,angle2,angle3):
        self.angle1  = angle1
        self.angle2  = angle2
        self.angle3  = angle3
    def check_angles(self):
        if self.angle1+self.angle2+self.angle3 == 180:
            return True
        else:
            return False
milton = Triangle(60,60,60)
print milton.check_angles()
#True

 1 class Triangle(object):
 2     number_of_sides = 3
 3     def __init__(self,angle1,angle2,angle3):
 4         self.angle1  = angle1
 5         self.angle2  = angle2
 6         self.angle3  = angle3
 7     def check_angles(self):
 8         if self.angle1+self.angle2+self.angle3 == 180:
 9             return True
10         else:
11             return False
12
13 class Equilateral(Triangle):
14     angle = 60
15     def __init__(self):
16         self.angle1 = self.angle
17         self.angle2 = self.angle
18         self.angle3 = self.angle
19 my_triangle  = Triangle(60,60,60)
20 print my_triangle.number_of_sides
21 print my_triangle.check_angles()