def METHOD_NAME(self):
    if self._token_count < self._num_tokens:
        lexpos = self._current_position
        self._token_count += 1
        self._current_position = self._token_count * 2
        return LexerToken(type="NUMBER",
                          value=str(self._token_count),
                          partial=self._mark_last_partial and self._token_count == self._num_tokens,
                          lexpos=lexpos)
    return None