Method _could_be_tzname

src/dateutil/parser/_parser.py:1056–1062

(self, hour, tzname, tzoffset, token)

            (res.second, res.microsecond) = self._parsems(value_repr)

    def _could_be_tzname(self, hour, tzname, tzoffset, token):
        return (hour is not None and
                tzname is None and
                tzoffset is None and
                len(token) <= 5 and
                (all(x in string.ascii_uppercase for x in token)
                 or token in self.info.UTCZONE))

    def _ampm_valid(self, hour, ampm, fuzzy):
        """