WEEK2---购物车

 

product_list = [
    ('iphone',5800),
    ('Mac pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',34),
    ('Book',120),
]
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("choose what you want>>>:")
        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:#买的起
                    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],还买个毛线\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")

 

isdigit()方法的语法：

str.isdigit()

如果字符串中的所有字符都是数字，并至少有一个字符此方法返回true，否则返回false。

运行上面的程序，它会产生以下结果：

True

False