Python - sqlite3.OperationalError: unable to open database file

I opened the rights to everything, but still does not work. Ubuntu 18.04.

Code:

conn=connect('home/usr/downloads/databases/database_for_enter.db3') cursor = conn.cursor() conn.commit() cursor.execute("CREATE TABLE IF NOT EXISTS Enter(login REAL, password TEXT)") cursor.execute("INSERT INTO Enter VALUES(?, ?)", (login_enter.get(), password_enter.get())) conn.close() cursor.close()