Python-单例模式

Python中的单例模式

• 在Python中__new__方法用于创建对象，__init__用于初始化对象

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
		print("初始化播放器")
		MusicPlayer.init_flag = True

player_1 = MusicPlayer()
player_2 = MusicPlayer()
print(player_1)
print(player_2)