python的特殊方法介绍
__repr__、__str__
__len__、__getitem__、__setitem__、__delitem__、__contains__
__iter__、__reversed__、__next__
__call__
__enter__、__exit__
__new__、__init__、__del__
__getattr__、__getattribute__、__setattr__、__delattr__、__dir__
__get__、__set__、__delete__
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