Python进阶之路——简单购物代码

1.input 输入默认为string类型，如果需要使用输入的数字，要先转换为整型：

2.需要显示元组序号的有两种方式：

 

 

3.python里，比较符号可以简写：

 

4.python里几种输出变量的方式，注意空格：

 

5.python里可以高亮输出：

结果为

或者

 

结果为;

 

源代码：
product_list = [
    ('iphone', 5000),
    ('mac Pro', 12000),
    ('bike', 800),
    ('book', 120),
    ('watch', 10600),
    ('coffee', 20)
]
shopping_list = []
salary = input("input you salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        # for item in product_list:
        #     print(product_list.index(item), item)
        for index, item in enumerate(product_list):
            print(index, item)
        user_choice = input("请输入想要买的商品序号：")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if 0 <= user_choice < len(product_list):
                p_item = product_list[user_choice]
                if p_item[1] <= salary:
                    shopping_list.append(p_item)
                    salary -= p_item[1]
                    print("%s is added into your shopping_list,the current balance is \033[31;1m%s\033[0m" % (p_item[0], salary))
                else:
                    print("\033[41;1m余额不足\033[0m")
            else:
                print("\033[41;1m商品不存在，请重新输入\033[0m")

        elif user_choice == 'q':
            print("--------shopping_list--------")
            for p in shopping_list:
                print(p)
            print("your current salary:",salary)
            exit()
        else:
            print("\033[41;1m invalid input\033[0m")
else:
    print("\033[41;1m invalid input\033[0m")