Python的第2天

今天有个简单的购物车小程序来分享一下

product_list=[
('iPhone',5888),
('Mac Pro',9880),
('Bike',880),
('AppleWatch',2300),
('Tea',66)
]
shopping_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("Choice the item than your wantto buy>>>>:")
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
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],无法继续购买\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:
print("invalid option")

里面用到了列表、判断和循环非常简单，但是购物车的信息不能留存，得想个办法