python_shopping

# author: Roy.G
shopping_cart=[]
salery=input("salery is :")
item_list=[
    ("a",500),
    ("b",600),
    ("b",700),
    ("d",800),
    ("e",900),
    ("f",1000),
    ("g",1100),
    ("h",1200),
    ]
if salery.isdigit():
    salery=int(salery)
    while True:  # 如果没有break，这个判断会一致下去，不停止
        for index,item in enumerate(item_list):
            print(index,item)
        user_choice=input("choice is :")
        if user_choice.isdigit(): #shopping
            user_choice=int(user_choice)
            if user_choice<len(item_list) and user_choice>=0:
                p_item=item_list[user_choice]
                if p_item[1]<=salery: # coud buy
                    shopping_cart.append(p_item)
                    salery=salery-p_item[1]
                    print("added %s in shopping cart,salery left %s"%(p_item,salery))
                if p_item[1]>salery: #coud not buy
                    print("your count is not enough,balance:%s"%(salery))
            else:
                 print("choice is not correct")
        elif user_choice=="q":
            print("shoping done")
            print("----------shoping list-----------")
            for p in shopping_cart:
                print(p)
            print("balance is %s"%(salery))
            exit()
elif salery.isdigit():
    print("bad choise")