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__delattr__???Python?????????

????????????????getattribute?setattr????????????????????????Python????????????get?set?delete??delete??????????__delattr__???????????????????????????????????????????

__delattr__??????

__delattr__??????????????????????

??.__delattr__(???)

????????????????car.power?????__delattr__??????????????

car.__delattr__('power')

????

????

?????Car???????__delattr__??????

• ????

  class Car:
      refcount = 0  # ???????__delattr__??
      def __init__(self, power):
          self.power = power
          self.totaldistance = 0
      def drive(self, distance):
          print(f"In method drive: distance={distance}")
          self.totaldistance += distance

• ?????

  car = Car('?????')

• ?????

  car.__dict__  # ??????????{'power': '?????', 'totaldistance': 0}

• ???????

  car.__delattr__('power')  # ???AttributeError: '?????'

  ???????????????__delattr__????

• ?????

  car.__delattr__('power')  # ??power??

  ???

  car.__dict__  # {'totaldistance': 0}

• ????? ?????????????__delattr__???

  car.__delattr__('drive')  # ???AttributeError: 'drive'

??????????

def __delattr__(self, name):
    print(f"?????{name}")
    super().__delattr__(name)

??

__delattr__????????????????????????????????????????????????????????????????????????????

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