问要调用Python3.4Python3.4的属性(应该吗？)存在

EN

class DB:

    def __getattribute__(self, name):
        print('__getattribute__("%s")' % name)
        if name.startswith('__') and name not in ['__init__', '__new__',
                '__dict__', '__getattribute__', '__getattr__', '__setattr__',
                '__delattr__', '__doc__', '__module__', '__del__', '__hash__']:
            return eval('self._d.%s' % name)
        print('it is not being diverted to self._d')
        raise AttributeError(name)

    def __getattr__(self, name):
        print('__getattr__("%s")' % name)
        if name.startswith('__'):
            raise AttributeError(name)
        return eval('self._d.%s' % name)

    def __setattr__(self, name, val):
        if name == '_d':
            self.__dict__[name] = val
        else:
            return self._d.__setattr__(name, val)

    def __delattr__(self, name):
        if name == '_d':
            del self.__dict__[name]
        else:
            return self._d.__delattr__(name)

    def __init__(self):
        self._d = {}

>>> d = DB()
__getattribute__("__dict__")
it is not being diverted to self._d
__getattr__("__dict__")
Traceback (most recent call last):
  File "<pyshell#2>", line 1, in <module>
    d = DB()
  File "<pyshell#1>", line 31, in __init__
    self._d = {}
  File "<pyshell#1>", line 20, in __setattr__
    self.__dict__[name] = val
  File "<pyshell#1>", line 15, in __getattr__
    raise AttributeError(name)
AttributeError: __dict__