code: def add_text_memo(self, memo_text):
          
          memo_text = memo.TextMemo(memo_text)
          return self.add_memo(memo_text)
docs: Set the memo for the transaction to a new :class:`TextMemo
          <stellar_base.memo.TextMemo>`.
  
          :param memo_text: The text for the memo to add.
          :type memo_text: str, bytes
          :return: This builder instance.