1 import sqlite3

     2 

     3 def collate_reverse(string1, string2):

     4     return -cmp(string1, string2)

     5 

     6 con = sqlite3.connect(":memory:")

     7 con.create_collation("reverse", collate_reverse)

     8 

     9 cur = con.cursor()

    10 cur.execute("create table test(x)")

    11 cur.executemany("insert into test(x) values (?)", [("a",), ("b",)])

    12 cur.execute("select x from test order by x collate reverse")

    13 for row in cur:

    14     print row

    15 con.close()