item方法

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __getitem__(self, item):
        return self.__dict__[item]

    def __setitem__(self, key, value):
        self.__dict__[key] = value

    def __delitem__(self, key):
        self.__dict__.pop(key)


p = Person("tom", 12)

print(p.age)
print(p['age'])
p['age'] = 22
# del p['age']
# print(p['age'])

del p.age
print(p['age'])