Python 实例01-购物车

product_list =[
    ('iphone',5800),
    ('Mac',9800),
    ('Bike',800),
    ('iWatch',3800),
    ('coffee', 30),
    ('book', 80),
]
shopping_list = []
salary = input("Input your salary:")
if salary.isdigit():#对整数进行判断
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):#enumerate把列表中下标打出来
            #print(product_list.index(item),item)
            print(index,item)
        user_choice = input("choose product:")
        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))#出红色\033[31;1m%s\033[0m
                else:
                    print("\033[41;1m你的余额只有[%s]了\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")

        #break