product_list=[('iphone',5800),

('pro',120000),

('python book',120),

('Bike',800),

('coffe',39)

] #定义商品列表

shopping_list=[] #定义购物车

salary=input("your sally:") #输入薪水

if salary.isdigit(): #判断是否为数字

salary=int(salary)

while True:

for index,item in enumerate(product_list): #enumerate 取下标和内容

print(index,item)

user_choice=input("please you choose product:") #输入商品编号

if user_choice.isdigit():

user_choice=int(user_choice)

if user_choice=0:

p_item=product_list[user_choice]

if salary>=p_item[1]:

shopping_list.append(p_item)

salary=salary-p_item[1]

print("added %s into shopping cart,your current balance is %s"%(p_item,salary))

else:

print("你的余额只剩 %s ,不能买了" %salary)

else:

print("您选择的不存在")

elif user_choice=="q": #输入q 退出循环

print("-------------shopping list----------")

for i in shopping_list: #遍历打印购物车

print(i)

exit()

else:

print("Invalid option")

else:

print("your salary is wrong")