Python Adventures

The atexit module defines a single function to register cleanup functions. Functions thus registered are automatically executed upon normal interpreter termination.

Example
I tried today SQLite and I noticed that commit() must be called explicitly, it’s not called automatically when the program terminates. I thought that when the connection object goes out of scope, it calls commit and close, but no…

So here is my solution (extract):

SQLITE_DB = None
conn = None

def init(sqlite_db):
    """Initialize the DB."""
    global SQLITE_DB, conn
    atexit.register(commit_and_close)    # HERE
    SQLITE_DB = sqlite_db
    
    if not os.path.exists(SQLITE_DB):
        create_db()
    if not conn:
        conn = sqlite3.connect(SQLITE_DB)

def commit_and_close():
    """Commit and close DB connection."""
    if conn:
        conn.commit()
        conn.close()

You can find the full source code here.