1import sqlite3
2
3con = sqlite3.connect(":memory:")
4con.execute("create table person (id integer primary key, firstname varchar unique)")
5
6# Successful, con.commit() is called automatically afterwards
7with con:
8    con.execute("insert into person(firstname) values (?)", ("Joe",))
9
10# con.rollback() is called after the with block finishes with an exception, the
11# exception is still raised and must be caught
12try:
13    with con:
14        con.execute("insert into person(firstname) values (?)", ("Joe",))
15except sqlite3.IntegrityError:
16    print "couldn't add Joe twice"
17