1.需求：
1：启动程序后，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，够就直接付款，不够就提醒
4：可随时推出，推出时，打印已购买商品和余额2.代码如下：
__author__ = "B J" product_list = [ (‘Iphone‘,5800), (‘Mac Pro‘,9800), (‘Bike‘,800), (‘Watch‘,10600), (‘Coffee‘,31), ] shopping_list = [] salary = input("Input your salary:") if salary.isdigit(): salary = int(salary) while True: for index,item in enumerate(product_list): #print(product_list.index(item),item) print(index,item) user_choice = input("选择要买嘛？>>>:") 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: #买的起 shopping_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]啦，还买个毛线\033[0m" % salary) else: print("product code [%s] is not exist!"% user_choice) elif user_choice == ‘q‘: print("--------shopping list------") for p in shopping_list: print(p) print("Your current balance:",salary) exit() else:
原文：https://www.cnblogs.com/jb9527/p/10012293.html