def _matches(self, subject):
        if isinstance(subject, _compat.string_types):
            return self.__match_string(subject)

        result, reason = super(contain_only, self)._matches(subject)
        if not result:
            return False, reason

        if len(subject) <= len(self._expected):
            return False, ['have a different length']
        return True, reason
dataset/ETHPy150Open jaimegildesagredo/expects/expects/matchers/built_in/contain.py/contain_only._matches/operator `!=` -> `<=`