求教：python中类的问题！一下代码一直报错

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def__init__(self,kind="cheese"):self.set_kind(kind)returndefset_kind(self,kind):possible_ingredients=self.__known_kinds(kind)ifpossible_ingredients==False:returnFalseelse:self.kind=kindself.needed_ingredients=possible_ingredients以上代码都是Omelet类中的函数AttributeError: 'Omelet' object has no attribute '_Omelet__known_kinds'如此报错求助！（鞠躬）def __known_kinds(self,kind): if kind == "cheese": return{"eggs":2,"milk":1,"cheese":1} elif kind == "mushroom": return{"eggs":2,"milk":1,"cheese":1,"mushroom":2} elif kind == "onion": return{"eggs":2,"milk":1,"cheese":1,"onion":1} else: return False

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