Python中的单例模式

class Cat(object):
    __istance = None

    def __init__(self,name):
        self.name = name

    def __new__(cls,name):
        if not cls.__istance:
            cls.__istance = object.__new__(cls)
        return cls.__istance

    def eat(self):
        print("cat eat ")

c1 = Cat("波斯猫")
c2 = Cat("流浪猫")

print("c1----%s，name=%s"%(id(c1),c1.name))
print("c2----%s，name=%s"%(id(c2),c2.name))

结果

c1----33783480，name=流浪猫
c2----33783480，name=流浪猫