编程语言
首页 > 编程语言> > 20201231-1 购物车程序练习实例

20201231-1 购物车程序练习实例

作者:互联网

程序讲解:
商品列表是动态的,可能随时增加,减少,所以不能写死

Step1:打印商品列表
方式1
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',120),
]

工资只输入一次,所以放循环外面
salary = input("Input your salary: ")
if salary.isdigit():
    salary = int(salary)
    while True:
        for item in product_list:
            print(product_list.index(item), item)

        break

方式2
不通过下标,一个更直接的方法
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',120),
]

salary = input("Input your salary: ")
if salary.isdigit():
    salary = int(salary)
    while True:
        for index, item in enumerate(product_list):
            print(index, item)

        break
1. 关于 enumerate
>>> a = [1,2,3]
>>> for i in enumerate(a):print(i)
...
(0, 1)
(1, 2)
(2, 3)
每一个 i 都变成了 一个元组 第一个是小标,第二个是数据本身
enumerate 做的就是 取出了 列表的下标

Step2:根据用户选择做判断
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',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("选择要买嘛?>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >= 0:
                # 接下来判断钱是否够用
                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 %s" %(p_item, salary))
        elif user_choice == 'q':
            print('exit....')
        else:
            print("invalid option")
1. 如果想给结果变个颜色,红色 31,绿色 32
print("Added %s into shopping cart, your current balance is \033[31;1m%s\033[0m" %(p_item, salary))
这个就是死记,后面 \033[0m 一定要关闭
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',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("选择要买嘛?>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >= 0:
                # 接下来判断钱是否够用
                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))
        elif user_choice == 'q':
            print('exit....')
        else:
            print("invalid option")
2. 这是能买得起的情况,如果买不起呢?
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',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("选择要买嘛?>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >= 0:
                # 接下来判断钱是否够用
                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]啦,还买个毛线\033[0m"%salary)
                    2-1 31 和 41 的区别
                    32 是绿色,42 就是背景是绿色
        elif user_choice == 'q':
            print('exit....')
        else:
            print("invalid option")


3. 如果现在想退出了,打印已经买的产品
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',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("选择要买嘛?>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >= 0:
                # 接下来判断钱是否够用
                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]啦,还买个毛线\033[0m"%salary)
        elif user_choice == 'q':
            print("-------shopping list--------")
            for p in shopping_list:
                print(p)
            3-1. 最后是退出,用exit()
            print("Your current balance:",salary)
            exit()
        else:
            print("invalid option")

4. 现在可以输入 6 应该如何处理?
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',120),
]
shopping_list = []
salary = input("Input your salary: ")                   # 输入工资,判断是不是数字
if salary.isdigit():                                    # 如果是数字
# 如果输入的工资不是数字,就退出了,可以加 else 判断
    salary = int(salary)                                # 将其int
    while True:
        for index, item in enumerate(product_list):
            print(index, item)
        user_choice = input("选择要买嘛?>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)

            if user_choice < len(product_list) and user_choice >= 0:
                # 接下来判断钱是否够用
                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]啦,还买个毛线\033[0m"%salary)
            # 4-1 如果输入的数字不在范围内
            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")

 

标签:salary,product,list,choice,item,实例,user,20201231,购物车
来源: https://blog.51cto.com/u_15149862/2834584