แสดงชื่อร้านที่มีอุปกรณ์ในสต็อกมากที่สุด
Show the name of the shop that has the most kind of devices in stock.
shop_df = pd.DataFrame(columns=['Shop_Name', 'Shop_ID']); stock_df = pd.DataFrame(columns=['Shop_ID'])
shop_df.loc[shop_df['Shop_ID'] == stock_df['Shop_ID'].value_counts().idxmax(), 'Shop_Name']