docs: def getrawpartid(self, msgid, partid, stream=sys.stdout):
          """Get a specific part from the message and print it raw.
          """
          parts = [part for hdr,part in self._get(msgid)]
          part = parts[int(partid)]
          pl = part.get_payload(decode=True)
          if pl != None:
              print(pl, file=stream)