【学习】操作符重载

 1 class Time(object):
 2     def __init__(self,hour=0,minute=0,second=0):
 3         self.hour = hour
 4         self.minute = minute
 5         self.hour = hour
 6     ...
 7     def __add__(self,other):
 8         ‘‘‘以下仅作示意用，未考虑进位‘‘‘
 9         hour = self.hour + other.hour
10         minute = self.minute + other.hour
11         second = self.second + other.second
12         print(‘%.2d:%.2d:%.2d‘ %(hour,minute,second))
13         
14 start = Time(11,20)
15 end = Time(1,25,20)
16 ‘‘‘当运行+运算符会自动调用Time类中的__add__方法‘‘‘
17 start + end

 1 class Time(object):
 2     def __init__(self,hour=0,minute=0,second=0):
 3         self.hour = hour
 4         self.minute = minute
 5         self.second = second
 6     ...
 7     def __add__(self,other):
 8         ‘‘‘内置函数isinstance判断数据类型‘‘‘
 9         if isinstance(other,Time):
10             ‘‘‘类中调用类的函数不需要self参数‘‘‘
11             self.add_time(other)
12         if isinstance(other, int):
13            self.add_interval(other)
14     def add_time(self,other):       
15         ‘‘‘以下仅作示意用，未考虑进位‘‘‘
16         hour = self.hour + other.hour
17         minute = self.minute + other.minute
18         second = self.second + other.second
19         print(‘%.2d:%.2d:%.2d‘ %(hour,minute,second))
20     def add_interval(self,other):       
21         ‘‘‘以下仅作示意用，未考虑进位‘‘‘
22         hour = self.hour
23         minute = self.minute
24         second = self.second + other
25         print(‘%.2d:%.2d:%.2d‘ %(hour,minute,second))
26         
27 start = Time(11,20)
28 end = Time(1,25,20)
29 ‘‘‘当运行+运算符会自动调用Time类中的__add__方法‘‘‘
30 start + end
31 >>>12:45:20
32 end1 = 20
33 ‘‘‘当运行+运算符会自动调用Time类中的__add__方法‘‘‘
34 start + end1
35 >>>11:20:20