【python练习】购物车程序

购物车程序

基本功能:

1、使用用户名密码登陆

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、可以记录用户的消费记录，余额，在下次登陆的时候恢复

6、允许查询之前的消费记录

运行方法:
文件执行、交互式执行。

使用说明：
测试账号（用户名：liubei，密码：lb123）

---

用户数据：

{"lock state": true, "account": "liubei", "password": "lb123", "balance": 993, "record": {"20180101": {"00:00:00": {"name": "u7535u8111", "price": 1999}, "23:01:02": {"name": "u9f20u6807", "price": 10}}, "20180202": {"00:02:00": {"name": "u7f8eu5973", "price": 998}}, "20180724": {"22:11:13": {"name": "u7535u8111", "price": 1999}, "22:11:14": {"name": "u9f20u6807", "price": 10}, "22:38:21": {"name": "u7535u8111", "price": 1999}, "22:40:32": {"name": "u7535u8111", "price": 1999}, "22:41:31": {"name": "u7535u8111", "price": 1999}, "22:41:35": {"name": "u9f20u6807", "price": 10}, "22:42:41": {"name": "u7535u8111", "price": 1999}, "22:42:43": {"name": "u9f20u6807", "price": 10}, "22:46:16": {"name": "u9f20u6807", "price": 10}, "22:56:56": {"name": "u9f20u6807", "price": 10}, "23:13:32": {"name": "u7535u8111", "price": 1999}}}}

#!/usr/bin/env python
# -*- coding: utf-8 -*-

'''
测试账号（用户名：liubei，密码：lb123）
'''

import os,time
import json

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

class Shopping(object):
    def __init__(self):
        self.acc_data = {} #用户信息

    def authentication(self):
        '''
        用户认证程序
        :return:登陆成功返回True
        '''
        acc = ''
        auth_list = []  # 用于存放每次输入的用户名

        print('- - - Login - - -')
        while auth_list.count(acc) < 3:  # 当相同的用户名登陆失败3次，跳出循环
            acc = input('Account:').strip()
            pwd = input('Password:').strip()

            path = 'data\%s' % acc  # 用户信息存放路径
            if os.path.isfile(path):  # 用户名是否存在
                with open(path) as f:
                    self.acc_data = json.loads(f.read())    #读取信息
                    if self.acc_data['lock state']:  #用户是否被锁定
                        if self.acc_data['password'] == pwd:
                            print('Login success !')
                            return True
                        else:
                            auth_list.append(acc)
                            print('The password is error,you have %s times' % (3 - auth_list.count(acc)))
                    else:
                        print('You have tried 3 times,your account has locked.')
                        exit()
            else:
                auth_list.append(acc)
                print('The account is not exist...you have %s times' % (3 - auth_list.count(acc)))

        if auth_list.count(acc) == 3:  # 已存在的用户登陆失败三次，锁定，写入文件
            if os.path.isfile(path):
                with open(path, 'w')as f:
                    self.acc_data['lock state'] = False
                    f.write(json.dumps(self.acc_data))

    def shopping(self):
        '''
        购物窗口
        :return:
        '''
        buy_dic = []
        while True:
            print('List of goods'.center(30,'-'))
            for index,item in enumerate(goods,1):
                print('%s . 33[0;33m%s33[0m   33[0;32m%s33[0m'%(index,item['name'],item['price']))
            buy = input('("q" to exit)
choose one to buy:').strip()
            if buy.isnumeric() and 0 < int(buy) <= len(goods): #输入是数字且在商品序号范围内
                if self.acc_data['balance'] >= int(goods[int(buy) - 1]['price']):
                    self.acc_data['balance'] -= int(goods[int(buy) - 1]['price'])    #扣除余额
                    buy_dic.append(goods[int(buy) - 1]) #购物记录
                    #更新购物清单
                    localday = time.strftime('%Y%m%d', time.localtime())
                    localtime = time.strftime('%H:%M:%S', time.localtime())
                    if localday in self.acc_data['record']:
                        self.acc_data['record'][localday][localtime] = goods[int(buy) - 1]
                    else:
                        self.acc_data['record'][localday] = {localtime:goods[int(buy) - 1]}
                    #写入文件
                    if self.db_handle():
                        print('You have buy:33[0;32m%s33[0m'%goods[int(buy) - 1]['name'])
                    else:
                        print('33[0;31mSystem error...you have not buy %s33[0m'%goods[int(buy) - 1]['name'])
                else:
                    print('33[0;33mYour balance can not afford anyone..33[0m')
            elif buy == 'q':
                if len(buy_dic) != 0:
                    print('33[1;31;46mShopping receipts33[0m')
                    for index,item in enumerate(buy_dic,1):
                        print('%s . 33[0;33m%s33[0m   33[0;32m%s33[0m' % (index, item['name'], item['price']))
                break
            else:
                print('33[0;31minput error...33[0m')

    def recharge(self):
        '''
        充值
        :return:
        '''
        recharge = input('You want to recharge:').strip()
        if recharge.isnumeric() and int(recharge) < 0:
            print('33[0;31mPlease input a number greater than zero33[0m')
        elif recharge.isnumeric():
            self.acc_data['balance'] += int(recharge)
            if self.db_handle():
                print('33[0;31mRecharge success !33[0m')
            else:
                print('33[0;31mRecharge error...33[0m')
        else:
            print('33[0;31minput error...33[0m')

    def record(self):
        '''
        查询历史清单
        :return:
        '''
        for date in self.acc_data['record']:
            print('33[0;34m%s33[0m'%date.center(20, '-'))
            for time in self.acc_data['record'][date]:
                print(time, ':', self.acc_data['record'][date][time]['name'],
                      self.acc_data['record'][date][time]['price'])

    def exit(self):
        '''
        退出函数
        :return:
        '''
        print('exit...')
        exit()

    def db_handle(self):
        '''
        文件写入
        :return:
        '''
        with open('data\'+self.acc_data['account'],'w') as f:
            f.write(json.dumps(self.acc_data))
            return True

    def interaction(self):
        '''
        交互
        :return:
        '''
        print(' Mall '.center(30, '*'))
        if self.authentication():    #登陆认证成功
            exit_flag = False
            while not exit_flag:
                print('''
Vip name:{account}
Balance:33[1;31;46m{balance}33[0m

1.  购物
2.  充值
3.  清单
4.  退出
                '''.format(account=self.acc_data['account'], balance=self.acc_data['balance']))

                menu_dic = { #对应类方法的字典
                    '1': self.shopping,
                    '2': self.recharge,
                    '3': self.record,
                    '4': self.exit
                }
                user_option = input('>>>').strip()
                if user_option in menu_dic:
                    menu_dic[user_option]()
                else:
                    print('Without this option(%s)' % user_option)

s = Shopping()    #实例化
s.interaction()