def get_serializer(self, content_type, default_serializers=None):
        """Returns the serializer for the wrapped object.

        Returns the serializer for the wrapped object subject to the
        indicated content type.  If no serializer matching the content
        type is attached, an appropriate serializer drawn from the
        default serializers will be used.  If no appropriate
        serializer is available, raises InvalidContentType.
        """

        default_serializers = default_serializers or {}

        try:
            mtype = _MEDIA_TYPE_MAP.get(content_type, content_type)
            if mtype in self.serializers:
                return mtype, self.serializers[mtype]
            else:
                return mtype, default_serializers[mtype]
        except (__HOLE__, TypeError):
            raise exception.InvalidContentType(content_type=content_type)
dataset/ETHPy150Open openstack/rack/rack/api/wsgi.py/ResponseObject.get_serializer