code: def do_rawpart(self, subcmd, opts, message):
          
          client = MdClient(self.maildir, filesystem=self.filesystem)
          partid = getattr(opts, "part", None)
          if not partid:
              client.getrawpart(message, self.stdout)
          else:
              client.getrawpartid(message, partid, self.stdout)
docs: ${cmd_name}: dump a part from the specified message
  
          ${cmd_usage}
          ${cmd_option_list}