❥单例模式❥
# 单例模式 class Index: # 方法1 _instance = None def __new__(cls, *args, **kwargs): if not cls._instance: cls._instance = object.__new__(cls, *args , **kwargs) return cls._instance # 方法2 def __new__(cls *args, **kwargs): if not hasattr(cls, '_instance'): setattr(cls, '_instance', super().__new__(cls, *args, **kwargs)) return getattr(cls, '_instance') # 方法3 @classmethod def index(cls): if not cls._instance: cls._instance = cls() return cls._instance
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趁自己还没死 多折腾折腾