简单购物车

Posted 2020-11-02 肌力兔子。

数据结构：
goods = [
{"name": "电脑", "price": 1999},
{"name": "鼠标", "price": 10},
{"name": "游艇", "price": 20},
{"name": "美女", "price": 998},
......
]

功能要求：
基础要求：

1、启动程序后，输入用户名密码后，让用户输入工资，然后打印商品列表

2、允许用户根据商品编号购买商品

3、用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒

4、可随时退出，退出时，打印已购买商品和余额

5、在用户使用过程中， 关键输出，如余额，商品已加入购物车等消息，需高亮显示


扩展需求：

1、用户下一次登录后，输入用户名密码，直接回到上次的状态，即上次消费的余额什么的还是那些，再次登录可继续购买

2、允许查询之前的消费记录

 

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Date    : 2018-04-29 12:16:23
# @Author  : hjc ([e-mail])
# @Link    : http://www.cnblogs.com/tootooman/
# @Version : 2


import os
import re
import time
import json

goods = [
    {"name": "电脑", "price": 1999},
    {"name": "鼠标", "price": 10},
    {"name": "游艇", "price": 20},
    {"name": "美女", "price": 998},
]

userdb = \'userdb\'
if not os.path.isfile(userdb):
    db = open(userdb, \'w\', encoding=\'utf8\')
    db.write(\'{}\')
    db.close()

shopping_car = {}


flag = True

while flag:
    username = input(\'用户名:\').strip()
    password = input(\'密码:\').strip()
    with open(userdb, \'r+\') as users:
        users_data = json.load(users)
        if username in users_data:
            if password == users_data[username]:
                # os.path.isfile(username)
                check = input(\'是否要查看消费历史[y：查看/任意键：进入商城]：\').strip()
                f = open(username, \'r\', encoding=\'utf8\')
                if check == \'y\':
                    print(\'start\'.center(60, \'-\'))
                    for line in f:
                        print(line)
                    print(\'end\'.center(60, \'-\'))

                ret = \'\'
                f.seek(0)
                for line in f:
                    ret = re.findall(\'余额.*\', line)
                salary = int(ret[0].split(\'：\')[-1])

                f.close()
                break
            else:
                print(\'用户名或密码错误。\')

        else:
            print(\'你不是会员！系统已自动帮你注册会员！\')
            users.seek(0)
            users_data[username] = password
            json.dump(users_data, users)
            while 1:
                salary = input(\'兜里有多少钱：:\').strip()
                if salary.isdigit():
                    salary = int(salary)
                    f = open(username, \'w\', encoding=\'utf8\')
                    f.close()
                    flag = False
                    break
                else:
                    print(\'你兜里的不是钱！\')

while 1:
    title = \'\'\'
    %s
    %s
    %s
    \'\'\' % (\'\'.center(60, \'*\'), \'商品列表\'.center(60, \' \'), \'\'.center(60, \'*\'))
    print(title)
    for i in range(len(goods)):
        info = \'\'\'
        商品编号：%s    商品名称：%s    商品价格：%s
        \'\'\' % (i, goods[i][\'name\'], goods[i][\'price\'])
        print(info)
    choice = input(\'输入商品编号[q：结算]:\').strip()
    if choice.isdigit():
        choice = int(choice)
        if choice >= 0 and choice < len(goods):
            if salary >= goods[choice][\'price\']:
                goods_name = goods[choice][\'name\']
                goods_price = goods[choice][\'price\']
                salary -= goods_price
                if shopping_car.get(goods_name):
                    shopping_car[goods_name][\'total\'] += 1
                    print(\'\\033[1;32m%s\\033[0m已放到购物车，购买后兜里还剩 \\033[1;31m%s\\033[0m\' % (
                        goods_name, salary))
                else:
                    shopping_car[goods_name] = {}
                    shopping_car[goods_name][\'price\'] = goods_price
                    shopping_car[goods_name][\'total\'] = 1
                    print(\'\\033[1;32m%s\\033[0m已放到购物车，购买后兜里还剩 \\033[1;31m%s\\033[0m\' % (
                        goods_name, salary))
            else:
                print(\'兜里钱不够！兜里还剩 \\033[1;31m%s\\033[0m ！\' % (salary,))
                while 1:
                    get_money = input(\'要不要借一点？[n：不要]：\').strip()
                    if get_money.isdigit():
                        get_money = int(get_money)
                        salary += get_money
                        print(\'借 钱 成 功！当前余额为：%s\' % (salary,))
                        break
                    elif get_money == \'n\':
                        break
                    else:
                        print(\'信不信我揍你。。。\')
        else:
            print(\'没有相关商品。\')
    elif choice == \'q\':
        if len(shopping_car) != 0:
            pay_time = time.strftime(\'%Y-%m-%d %H:%M:%S\', time.localtime())
            print(\'购物车信息：买完兜里还剩 \\033[1;31m%s\\033[0m\' % (salary))
            with open(username, \'a+\', encoding=\'utf8\') as f:
                f.write(\'%s\\n\' % (pay_time.center(50, \'=\')))
                for item in shopping_car:
                    shopping_list = \'\'\'
                    商品名称：%s    商品价格：%s    已买数量：%s    合计：%s
                    \'\'\' % (item,
                           shopping_car[item][\'price\'],
                           shopping_car[item][\'total\'],
                           shopping_car[item][\'total\'] *
                           shopping_car[item][\'price\'],
                           )
                    print(shopping_list.strip())
                    f.write(\'%s\\n\' % (shopping_list.strip()))
                f.write(\'余额：%s\\n\' % (salary))
            break
        else:
            print(\'没有买任何东西。\')
            break

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