Python学习——购物车程序

问题需求：

1、启动程序，让用户输入工资，然后打印商品列表

2、允许用户根据商品编号购买商品

3、用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒

4、可随时退出，退出时，打印已购买的商品和余额

 __author__ = 'jcx'

 product_list = [
     ('iphone11',5000),
     ('macbook pro',9800),
     ('Bike',800),
     ('Coffee',31),
     ('jcx\'s C++',60),
 ]

 shoping_list = []
 salary = input("Input your salary: ")
 if salary.isdigit():
     salary = int(salary)
     while True:
         for index,item in enumerate(product_list):
             print(index,item)
         user_choice = input("选择要买的商品>>>: ")
         if user_choice.isdigit():
             user_choice = int(user_choice)
             if user_choice < len(product_list) and user_choice >= 0:
                 p_item = product_list[user_choice]
                 if p_item[1] <= salary: #买得起
                     shoping_list.append(p_item)
                     salary -= p_item[1]
                     print("Added %s into shopping cart, your current balance is \033[31;1m%s\033[0m" % (p_item,salary))
                 else:
                     print("\033[41;1m你的余额只剩[%s]\033[0m" % salary)
             else:
                 print("product number [%s] is not exist." % user_choice)
         elif user_choice == 'q':
             print("------  shoping list -------")
             for p in shoping_list:
                 print(p)
             print("You current balance: \033[31;1m%s\033[0m" % salary)
             exit()
         else:
             print("invalid option")

输出结果：

 Input your salary: 6000
 0 ('iphone11', 5000)
 1 ('macbook pro', 9800)
 2 ('Bike', 800)
 3 ('Coffee', 31)
 4 ("jcx's C++", 60)
 选择要买的商品>>>: 0
 Added ('iphone11', 5000) into shopping cart, your current balance is 1000
 0 ('iphone11', 5000)
 1 ('macbook pro', 9800)
 2 ('Bike', 800)
 3 ('Coffee', 31)
 4 ("jcx's C++", 60)
 选择要买的商品>>>: 6
 product number [6] is not exist.
 0 ('iphone11', 5000)
 1 ('macbook pro', 9800)
 2 ('Bike', 800)
 3 ('Coffee', 31)
 4 ("jcx's C++", 60)
 选择要买的商品>>>: q
 ------  shoping list -------
 ('iphone11', 5000)
 You current balance: 1000

 Process finished with exit code 0