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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()
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