code: def iso_639_alpha3(code):
      
      code = normalize_code(code)
      code = ISO3_MAP.get(code, code)
      if code in ISO3_ALL:
          return code
docs: Convert a given language identifier into an ISO 639 Part 2 code, such
      as "eng" or "deu". This will accept language codes in the two- or three-
      letter format, and some language names. If the given string cannot be
      converted, ``None`` will be returned.