odict.py 文件源码

def __getattr__(self, name):
        """
        Implemented so that access to ``sequence`` raises a warning.

        >>> d = OrderedDict()
        >>> d.sequence
        []
        """
        if name == 'sequence':
            warnings.warn('Use of the sequence attribute is deprecated.'
                ' Use the keys method instead.', DeprecationWarning)
            # NOTE: Still (currently) returns a direct reference. Need to
            #   because code that uses sequence will expect to be able to
            #   mutate it in place.
            return self._sequence
        else:
            # raise the appropriate error
            raise AttributeError("OrderedDict has no '%s' attribute" % name)