product_list=[("iPhone XS Max 256G",11000),('MacBook Pro 512G',19000),('Bike',800),("Apple Watch Series 4",3500),("Coffee",30),("Alex Python Book",60)]
shopplist_list=[]
salary=input("请输入你的收入:")
if salary.isdigit():
salary=int(salary)
while True:
for index,item in enumerate(product_list):
print(index,item)
user_choice=input("你选择要买:").strip()
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:
shopplist_list.append(p_item)
salary=salary-p_item[1]
print("added %s into shopping cart,you current balance is %s"%(p_item,salary))
else:
print("你的余额只剩[%s]啦，余额不足"%salary)
else:
print("product code [%s] is not exist!"%user_choice)
elif user_choice=="q":
print("---shopping list----")
for p in shopplist_list:
print(p[0])
print("已经购买:",shopplist_list,"\n还剩",salary,"元")
break
else:
print("invalid option")
print("已经购买:", shopplist_list, "\n还剩", salary, "元")
break