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

        reasons = []
        try:
            for index, expected_item in enumerate(self._expected):
                expected_item = default_matcher(expected_item)
                result, _ = expected_item._match(subject[index])
                if not result:
                    return False, ['item {0!r} not found at index {1}'.format(expected_item, index)]
                else:
                    reasons.append('item {0!r} found at index {1}'.format(expected_item, index))
        except IndexError:
            return False, ['item {0!r} not found at index {1}'.format(expected_item, index)]

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