类的变量/方法 & 实例的变量/方法

类的变量/方法 & 实例的变量/方法

# -*- coding: gb18030 -*-class Singleton(object):    #变量在定义时候不区分“属于实例”还是“属于类”的    #在调用时候区分    # Singleton.__instance则是类的成员    # self.var则是实例的成员    __instance = None    var = 3    #类的方法    def __new__(cls, *args, **kwd):        if Singleton.__instance is None:            print "singleton"            #print "cls:", cls            #print "args:", args            #print "kwd:", kwd            Singleton.__instance = object.__new__(cls, *args, **kwd)            return Singleton.__instance    #实例方法    def doSth(self):        print "do sth", self.var    #类的方法    def doSth2(self):        print "do sth2", Singleton.varclass NonSingleton(object):    __instance = None    def __new__(cls, *args, **kwd):        print "non singleton"        NonSingleton.__instance = object.__new__(cls, *args, **kwd)        return NonSingleton.__instance    class MyClass(Singleton):    passclass MyClass2(NonSingleton):    passa=MyClass()b=MyClass()a.doSth()a.doSth2()a.var=4Singleton.var=5a.doSth()a.doSth2()c=MyClass2()d=MyClass2()

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