product_list=[('book',70),('bike',400),('iphne',3000),('food',100)]print(product_list)salary=0 #余额shopping_list=[] #购物车while True: salary=input("请输入您的工资:") if(salary.isdigit()): salary=int(salary) while True: choose_id=input("请输入商品ID:") if choose_id.isdigit(): #是数字 choose_id=int(choose_id) if(choose_id>=0 and choose_id<len(product_list)): if salary>=product_list[choose_id][1]: shopping_list.append(product_list[choose_id]) salary-=product_list[choose_id][1] else: print("您的余额不足!") else: print("商品不存在") elif choose_id=='q': print("您购买的商品有:%s,您的余额为%s"%(shopping_list,salary)) exit() else: print("商品ID格式不正确") break else: print("您的工资格式不正确!")