Python_Example_商品结算程序

            import
             sys

            ‘‘‘
            
__author__ = "chu ge "
购物车程序
1运行程序，输入预付款，
2允许user根据商品编号购买商品
3user选择商品后，检查余额是否足够，足够直接付款，不够提醒user
4可随时退出，退出时，打印已经购买的商品和余额

            ‘‘‘
            

product_list =[(‘Book‘,17.99),
               (‘Phone‘,4999),
               (‘Cothes‘,298),
               (‘Apple‘,32.76),
               (‘Break‘,98),
               (‘Milk‘,55),
               (‘Grape‘,25),
               (‘Wine‘,198),
               (‘Tea‘,76.89),
               (‘Biscits‘,49)
               ]

# 提示print(‘------------------------------------------------‘)
print(‘Input Your Payment ‘)
payment =input(">>> ")
print(‘Payment: %s 元‘ %(payment))

# 加入购物车的空列表
shopping_list = []



ifnot payment.isdigit():  # 判断是否是数字，如果不是直接退出print(‘请输入正取的金额...‘)
    exit()

else:
    # 如果是数字，继续执行
    payment = int(payment)

    while True:
            # for item in product_list:#     print(product_list.index(item),item)  # product_list.index(item) 获取下标# 打印商品信息for index,item in enumerate(product_list) :    # enumerate 把列表下标取出来print(index,item)     # product_list.index(item) 获取下标
        user_choice = input("请选择要购买的商品？\n>>>：")

            # 判断输入是否为数字if user_choice.isdigit():
            user_choice = int(user_choice)
                #判断输入长度（范围）if user_choice< len(product_list) and  0 <= user_choice:
                p_item = product_list[user_choice]

                if p_item[1] <= payment: # 足够付款 添加购物车                    shopping_list.append(p_item)
                    payment -= p_item[1]
                    print("商品信息:\033[32;1m %s\033[0m \t 付款余额: \033[31;1m %s\033[0m 元" %(p_item,payment))
                else:
                    print("足额不足: \033[35;1m %s\033[0m  元" %(payment))
            else:
                print(‘Product Not List ...‘)

        elif user_choice == ‘q‘:  # quitprint(" Shopping List....")
            for q in shopping_list:
                print(q)
            print(‘Your Payment: %s ‘%payment)
            exit()

        # break

------------------------------------------------
Input Your Payment 
>>> 10000
Payment: 10000 元
0 (‘Book‘, 17.99)
1 (‘Phone‘, 4999)
2 (‘Cothes‘, 298)
3 (‘Apple‘, 32.76)
4 (‘Break‘, 98)
5 (‘Milk‘, 55)
6 (‘Grape‘, 25)
7 (‘Wine‘, 198)
8 (‘Tea‘, 76.89)
9 (‘Biscits‘, 49)
请选择要购买的商品？
>>>：1
商品信息: (‘Phone‘, 4999) 	 付款余额:  5001 元
0 (‘Book‘, 17.99)
1 (‘Phone‘, 4999)
2 (‘Cothes‘, 298)
3 (‘Apple‘, 32.76)
4 (‘Break‘, 98)
5 (‘Milk‘, 55)
6 (‘Grape‘, 25)
7 (‘Wine‘, 198)
8 (‘Tea‘, 76.89)
9 (‘Biscits‘, 49)
请选择要购买的商品？
>>>：q
 Shopping List....
(‘Phone‘, 4999)
Your Payment: 5001 

Process finished with exit code 0