# coding=utf-8
class MusicPlayer(object):
instance = None
init_flag = False
def __new__(cls, *args, **kwargs):
if cls.instance is None:
cls.instance = super().__new__(cls)
return cls.instance
def __init__(self):
if MusicPlayer.init_flag:
return
else:
print("init ...")
MusicPlayer.init_flag = True
if __name__ == "__main__":
player1 = MusicPlayer()
print(player1)
player2 = MusicPlayer()
print(player2)
覆盖new，只返回instance
如果只初始化一次，覆盖init定义init_flag
参考资料：
