def connect_to_db():
    db_name = pref.dbname_local
    db_user = pref.user_local
    db_password = pref.password_local
    db_localhost = pref.host_local
    db_port = pref.port_local

    cur, conn = pref.connect_to_db(db_name, db_user, db_password, db_localhost, db_port)

    return cur, conn
def main_work():
    db_name = psql_preferences.dbname_local
    db_user = psql_preferences.user_local
    db_password = psql_preferences.password_local
    db_localhost = psql_preferences.host_local
    db_port = psql_preferences.port_local

    cur, conn = psql_preferences.connect_to_db(db_name, db_user, db_password, db_localhost, db_port)

    try:
        # добавление оценок событиям
        filling_rating_table(cur)

        conn.commit()
    except Exception as inst:
        print inst
    finally:
        psql_preferences.disconnect_from_db(cur, conn)