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import sqlite3

con = sqlite3.connect(":memory:")
con.execute("create table lang (id integer primary key, name varchar unique)")

# Successful, con.commit() is called automatically afterwards
with con:
    con.execute("insert into lang(name) values (?)", ("Python",))

# con.rollback() is called after the with block finishes with an exception, the
# exception is still raised and must be caught
try:
    with con:
        con.execute("insert into lang(name) values (?)", ("Python",))
except sqlite3.IntegrityError:
    print("couldn't add Python twice")

# Connection object used as context manager only commits or rollbacks transactions,
# so the connection object should be closed manually
con.close()