code: def is_python3_identifier(possible_identifier):
      
      possible_identifier = unicodedata.normalize('NFKC', possible_identifier)
      return (
          bool(possible_identifier) and
          _is_in_id_start(possible_identifier[0]) and
          all(map(_is_in_id_continue, possible_identifier[1:]))
      ) and not iskeyword(possible_identifier)
docs: Returns `True` if the given `possible_identifier` can be used as an
      identifier in Python 3.