def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def _convert_objectGUID(item):
    item = uuid.UUID("{{{0!s}}}".format(item)).bytes_le
    item = escape_bytes(item)
    return item