product_list = [
('Robot',200000),
('MacPro',12000),
('Iphone8',8888),
('Hello World',1200),
]
shopping_list = []
user_salary=input("请输入你的工资：")
if user_salary.isdigit():
user_salary = int(user_salary)
while True:
print("商品如下：")
for index,item in enumerate(product_list):
print (index,item)
user_choice = input("请输入要购买的商品编号：")
if user_choice.isdigit():
user_choice = int(user_choice)
if user_choice < len(product_list) and user_choice > -1:
p_item = product_list[user_choice]
if user_salary>=p_item[1]:
shopping_list.append(p_item)
user_salary-=p_item[1]
print("购买商品",p_item,"成功您的余额为",user_salary,"元！" )
else:
print("您的余额为",user_salary,"余额不足以购买此商品，购买失败！")
else:
print("并无此产品！")
elif user_choice == "q":
print("--------shopping list-------")
for i in shopping_list:
print(i)
exit()
else:
print("invalidate！！！")
