ค้นหาชื่อบริษัทที่ไม่ผลิตดีวีดีไดรฟ์
Find the name of companies that do not make DVD drive.
manufacturers_df = pd.DataFrame(columns=['name', 'code']); products_df = pd.DataFrame(columns=['Manufacturer', 'name']);
manufacturers_df[~manufacturers_df['code'].isin(products_df[products_df['name'] == 'DVD drive']['Manufacturer'])]['name']