def get_attr(self, obj, name):
        """Get attribute of the target object with the configured attribute
        name in the :attr:`~brownant.pipeline.base.PipelineProperty.attr_names`
        of this instance.

        :param obj: the target object.
        :type obj: :class:`~brownant.dinergate.Dinergate`
        :param name: the internal name used in the
                :attr:`~brownant.pipeline.base.PipelineProperty.attr_names`.
                (.e.g. `"text_attr"`)
        """
        attr_name = self.attr_names[name]
        return getattr(obj, attr_name)