单例设计模式代码实现

# pcj
class Musicplay(object):
    id=None

    def __new__(cls, *args, **kwargs):
        if cls.id is None:
            cls.id=super().__new__(cls)    #new是一个静态方法。所以要传cls参数
        return cls.id

    def __init__(self):
        print("音乐初始化中........")


music1=Musicplay()
music2=Musicplay()
print(music1)
print(music2)