1import sqlite3
2
3def collate_reverse(string1, string2):
4    if string1 == string2:
5        return 0
6    elif string1 < string2:
7        return 1
8    else:
9        return -1
10
11con = sqlite3.connect(":memory:")
12con.create_collation("reverse", collate_reverse)
13
14cur = con.cursor()
15cur.execute("create table test(x)")
16cur.executemany("insert into test(x) values (?)", [("a",), ("b",)])
17cur.execute("select x from test order by x collate reverse")
18for row in cur:
19    print(row)
20con.close()
21