code: def nodata(status_code):
      
      lookup = {
          '1': 'No armored data.',
          '2': 'Expected a packet but did not find one.',
          '3': 'Invalid packet found, this may indicate a non OpenPGP message.',
          '4': 'Signature expected but not found.' }
      for key, value in lookup.items():
          if str(status_code) == key:
              return value
docs: Translate NODATA status codes from GnuPG to messages.