Python Shopping Cart Program

Shopping Cart program writing method;

1, first of all its products listed, and then in the establishment of an empty list, for storing the goods purchased

2, enter the user's wages, in the judge whether the input is a number, if not, quit if it is to continue to execute

3. Enter into a dead loop while True:

4, the listing of all goods, in through the enumerate in the subscript out

5, let the user enter the number of products to be purchased, and determine whether the user input is a number

6, again determine whether the Q exit, if q is printed on the purchase of goods, and show the balance, if not the print prompt input error (invaild option), and re-enter

7, if the user is selected as a number, in judging whether the number in 0 and the listed goods through len() Judge

8, if in the range of the selected goods, in the determination of wages, check whether the purchase of the start, if you can purchase, add it by append and add it to the empty list

9, has been circulating to the user input q or not enough until the balance

and then print it out to

The procedure is as follows:

#首先通过列表将产品进行列出
Product_list = [
("iphone", 5800),
("MOC Pro", 9800),
("Bike", 800),
("Coffee", 31),
("Linux book", 80)
]
Shopping_list =[]
Salary = input ("Input your Salary:")
ifSalary.isdigit ():# used to determine if the input string is a number form true if yes
    salary = Int (salary)
While True:
# for item in Product_list: #for item in range product_list: wrong spelling
# Way One: print (Product_list.index (item), item) #通过 Index to display its subscript for the product number
         forIndex,iteminchEnumerate (product_list):# Method Two: index indicates that the subscript item represents the list data in the enumerate
            Print (Index,item)
User_choice = input ("Please input your want to buy thing:")
ifUser_choice.isdigit ():
User_choice =int (User_choice)
ifUser_choice<len (Product_list) andUser_choice>=0:
P_item =product_list[user_choice]#将用户选择的商品的下标取出来
                ifP_ITEM[1] <=salary:# Compare User-selected items with the salary of the user less than the salary indicated buy
                    Shopping_list.append (P_item)
Salary-=p_item[1]
Print"added%s into shopping cart,your balance\033[31;1m%s\033[0m]% (p_item,salary))#%s placeholder when used, it cannot be separated by commas , \033[31;1m%s\033[0m indicates that the value represented by the last placeholder is set to color
                Else:
Print"\033[41;1m Your balance remains%s, you can't afford it.\033[0m]%salary)
Else:
Print"Product [%s] is not exist!"%user_choice)
elifUser_choice = =' Q ':
Print"-------------shopping list-----------")
forPinchShopping_list:
Print (P)
Print"Your current balance:", salary)
Exit ()
Else:
Print"invaild option ...")

Python Shopping Cart Program