Python面向对象(self参数、封装)

day24

面向对象三大特性：封装

self参数

 1 class Bar:
 2     def foo(self, arg):
 3         print(self, arg)
 4 
 5 x = Bar()
 6 print(x)
 7 
 8 x.foo(112358)
 9 print('/////////////////////////////////////////')
10 y = Bar()
11 print(y)
12 
13 y.foo(112)
14 
15 #self指调用方法的对象

self指调用方法的对象

执行结果：

<__main__.Bar object at 0x7fae0e065780>
<__main__.Bar object at 0x7fae0e065780> 112358
/////////////////////////////////////////
<__main__.Bar object at 0x7fae0e065828>
<__main__.Bar object at 0x7fae0e065828> 112

Process finished with exit code 0

对象可以存值

 1 class Bar:
 2     def foo(self, arg):
 3         print(self, self.name, self.age, arg)
 4 
 5 x = Bar()
 6 x.name = 'nizhipeng'
 7 x.age = 18
 8 
 9 x.foo(1123)
10 
11 y = Bar()
12 y.name = 'nizsvsd'
13 y.age = 20
14 
15 y.foo(113)

执行结果:

1 <__main__.Bar object at 0x7fdadb4f5828> nizhipeng 18 1123

2 <__main__.Bar object at 0x7fdadb4f5860> nizsvsd 20 113

4 Process finished with exit code 0

封装（面向对象的三大特性之一）

1 class Bar:
2     def foo(self, arg):
3         print(self.name, self.age, arg)
4 
5 obj = Bar()
6 #将公共变量封装进对象中
7 obj.name = "nizhipeng"
8 obj.age = "18"
9 obj.foo("112358")

将公共变量封装进对象中，为封装。

nizhipeng 18 112358

Process finished with exit code 0