shopping cart

products = [ #Define product list
    ["Ipone",5800],
    ["Mac",15800],
    ["Coffee",30],
    ["Bike",2000],
    ["Cloth",500],
] 

shopping_list = [] #empty shopping cart

while True: #loop input salary
    salary = input("Your salary:")
    if salary.isdigit(): #Determine whether the input is an integer
        salary = int(salary) #Convert string to number
        break #Exit if executed correctly
    else:
        continue #Error loop execution


while True:
    print("product list".center(50,"-")) #Print "product list" in the center with "-" as the fill center: center printing
    for index,i in enumerate(products): #Print product list, price
        print(index,".",i[0],i[1])
    choice = input("Please enter the item number [quit]>>:")
    if choice.isdigit():
        choice = int(choice)
        if choice >=0 and choice < len(products): #judgment list length: len
            #Determine if the money is enough
            p = products[choice]
            if salary >= p[1]:#Buy from
                salary -= p[1] #Deduct money
                shopping_list.append(p) #Add to cart
                print("Added \033[32;1m[%s]\033[0m into your shopping cart,and your current balance is \033[41;1m%s\033[0m" %(p[0],salary))   #彩色打印
            else:
                print("Not enough money, you only have [%s]" % salary)
        else:
            print("There is no such item...")
    elif choice == "quit": #Enter quit to exit
        print("Purchased items".center(50,"-"))
        for i in shopping_list:
            print(i) #print shopping cart
        print("Your left balance is ", salary) #Print the remaining balance
        exit()