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什么是接口 ？
接口只是定义了一些方法，而没有去实现，多用于程序设计时，只是设计需要有什么样的功能，但是并没有实现任何功能，这些功能需要被另一个类（B）继承后，由
类B去实现其中的某个功能或全部功能。
遵循：开放封闭原则，依赖导致原则，接口隔离原则，继承多态。
编程思想：为子类做规范； 归一化设计：几个类都实现了相同的方法
抽象类：最好单继承，且可以简单的实现功能，接口类：可以多继承，且最好不实现具体功能
在python中接口由抽象类和抽象方法去实现，接口是不能被实例化的，只能被别的类继承去实现相应的功能。
个人觉得接口在python中并没有那么重要，因为如果要继承接口，需要把其中的每个方法全部实现，否则会报编译错误，还不如直接定义一个class，其中的方法实现全部为pass，让子类重写这些函数。
方法一：用抽象类和抽象函数实现方法（适用于单继承）
#抽象类加抽象方法就等于面向对象编程中的接口 from abc import ABCMeta,abstractmethod class
interface(object): __metaclass__ = ABCMeta #指定这是一个抽象类 @abstractmethod #抽象方法 def
Lee(self): pass def Marlon(self): pass class
RelalizeInterfaceLee(interface):#必须实现interface中的所有函数，否则会编译错误 def
__init__(self): print '这是接口interface的实现' def Lee(self): print '实现Lee功能' def
Marlon(self): pass class RelalizeInterfaceMarlon(interface):
#必须实现interface中的所有函数，否则会编译错误 def __init__(self): print '这是接口interface的实现' def
Lee(self): pass def Marlon(self): print "实现Marlon功能"
*
方法二：用普通类定义接口（推荐）
class interface(object): #假设这就是一个接口，接口名可以随意定义，所有的子类不需要实现在这个类中的函数 def
Lee(self):， pass def Marlon(self): pass class Realaize_interface(interface):
def __init__(self): pass def Lee(self): print "实现接口中的Lee函数" class
Realaize_interface2(interface): def __init__(self): pass def Marlon(self):
print "实现接口中的Marlon函数" obj=Realaize_interface() obj.Lee()
obj=Realaize_interface2() obj.Marlon()
*
