code: def buttons(self):
          
          if self._buttons is None and self.reply_markup:
              if not self.input_chat:
                  return
              try:
                  bot = self._needed_markup_bot()
              except ValueError:
                  return
              else:
                  self._set_buttons(self._input_chat, bot)
  
          return self._buttons
docs: Returns a matrix (list of lists) containing all buttons of the message
          as `MessageButton <telethon.tl.custom.messagebutton.MessageButton>`
          instances.