How to use the diskcache.DEFAULT_SETTINGS.items function in diskcache

def compare_pragmas():
        valid = True

        for key, value in dc.DEFAULT_SETTINGS.items():
            if not key.startswith('sqlite_'):
                continue

            pragma = key[7:]

            result = cache._sql('PRAGMA %s' % pragma).fetchall()

            if result == [(value,)]:
                continue

            args = pragma, result, [(value,)]
            print('pragma %s mismatch: %r != %r' % args)
            valid = False

        results.append(valid)