python/7ShoppingMate at master · xunxunmimi5577/python · GitHub

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2019/7/6 19:10
# @Author  : zx-long
# @File    : 项目一购物商城-深度之眼版.py
import os

commodity_list = [['Dell/戴尔游匣G5 游戏本 15.6英寸八代i5独显商务办公轻薄便携学生吃鸡', 6799],
             ['Lenovo/联想 拯救者 Y7000P 2019款 i7游戏本学生手提笔记本电脑英特', 7999],
             ['华硕（ASUS）飞行堡垒7 九代英特尔酷睿i7笔记本电脑游戏本华硕官方旗舰店官网', 6699],
             ['华为P20Pro', 5000],
             ['三星SamSung GalaxyS9', 4500],
             ['iPhone XR', 7000],
             ['Nikon/尼康 D750套机24-120mm f/4G ED VR全画幅专业单反相机摄影', 13000],
             ['Canon/佳能800D EOS 蚂蚁摄影 入门级单反相机 专业 数码高清旅游', 4699]]
shopping_cart = {}
current_user_info = []

db_file = r'user.txt'     # 文件前面加r就是不对文件中的符号进行转义

while True:
    print('''
    1.登陆
    2.注册
    3.购物
    4.充值
    ''')
    option  = input('请选择操作>>:').strip()

# 1.登陆
    if option == '1':
        tag = True
        count = 0
        while tag:
            if count == 3:
                print('对不起，您已被列入黑名单，禁止登陆！')
                break
            user_name = input('请输入用户名>>:')
            user_password = input('请输入密码>>:')

            with open(db_file, 'r', encoding='utf-8') as f:
                for line in f:
                    line = line.strip('\n')                      # 消除换行符
                    user_info = line.split('|')

                    user_info_name = user_info[0]
                    user_info_password = user_info[1]
                    balance_of_db = user_info[2]         # balance_of_db是从数据库得到的数据，balance是中间变量，是我们用来执行的一个替代，防止重要数据出错
                    balance = int(balance_of_db)

                    if user_name == user_info_name and user_password == user_info_password:
                        current_user_info = [user_info_name, balance]
                        print(('尊敬的{}您好，您已成功登陆，您的余额为{}').format(user_info_name, balance))
                        print('可以选择充值或者购物')
                        tag = False                                      # tag = False 还是会继续执行剩下的for循环
                        break                                            # break 会停止for循环
                else:print('用户名或者密码错误！！！')                    # 在for循环完整迭代一轮后执行else，若for循环被break则不执行else

# 2.注册
    if option == '2':
        print('欢迎您注册')
        while True:
            username = input('请输入用户名：').strip()
            with open(db_file, 'r', encoding='utf-8') as file:
                for i in file:
                    i = i.strip('\n')
                    registered_user = i.split('|')
                    if username == registered_user[0]:
                        print('该用户名已被注册')
                        break                # 跳出for循环
                else:
                    break                    # 跳出while循环

        while True:
            password1 = input('请设置密码').strip()
            password2 = input('请再次输入密码').strip()
            if password1 == password2:
                print('注册成功')
                break
            else:
                print('两次输入密码不一致，请重新输入！！！')
        with open('user.txt', 'a', encoding='utf-8') as g:
            g.write('\n%s|%s|0'%(username, password1))
            g.flush()                                    # 立即刷新到硬盘

# 3.购物
    if option == '3':
        if not current_user_info:
            print('请先登录。。。')
        else:
            print('祝您购物愉快！！！\n')

            tag = True
            while tag:
                for k,product in enumerate(commodity_list, 1):
                    print(k, product)
                option3 = input('输入商品编号以购买，按q退出>>:')
                if option3.isdigit():
                    option3 = int(option3)
                    if option3 < 0 or option3 > len(commodity_list):continue

                    commodity_name = commodity_list[option3-1][0]
                    commodity_price = commodity_list[option3-1][1]

                    if balance > commodity_price:
                        if commodity_name in shopping_cart:
                            shopping_cart[commodity_name]['数量'] += 1
                        else:
                            shopping_cart[commodity_name]={'单价':commodity_price, '数量': 1}

                        balance -= commodity_price
                        current_user_info[1]= balance               # 在列表中更新余额
                        print('您的购物车里有%s'% shopping_cart)

                    else:
                        print('您的余额不足以购买这件商品。。')

                elif option3 == 'q':
                    total_cost = 0
                    for i, key in enumerate(shopping_cart, 1):
                        print('%20s%18s%18s%18s%18s'%(
                            i,
                            key,
                            shopping_cart[key]['数量'],
                            shopping_cart[key]['单价'],
                            shopping_cart[key]['单价']*shopping_cart[key]['数量']
                        ))
                        total_cost += shopping_cart[key]['单价']*shopping_cart[key]['数量']
                    print('''
                    您的总消费为：%s
                    '''%total_cost)
                    while tag:
                        inp = input('确认购买（yes/no?)').strip()
                        if inp not in ['Y', 'y', 'N', 'n','yes', 'no']:continue
                        if inp in ['Y', 'y', 'yes']:
                            src_file = db_file
                            dst_file = r'%s.swap'% db_file           # 文件修改
                            with open(src_file,'r',encoding='utf-8') as read_file, open(dst_file,'w',encoding='utf-8') as write_file:
                                for line in read_file:
                                    if line.startswith(user_info_name):
                                        user_info_line_list = line.strip('\n').split('|')
                                        balance_of_db = str(balance)
                                        user_info_line_list[-1] = balance_of_db
                                        line = '|'.join(user_info_line_list)+'\n'

                                    write_file.write(line)
                            os.remove(src_file)
                            os.rename(dst_file, src_file)
                            print('购买成功！')

                        shopping_cart = {}    # 如果没有选择yes,则直接跳到这一步清空购物车，但是最后总是会执行这一步
                        current_user_info = []
                        print(shopping_cart)
                        tag = False
 # 4.充值
    if option == '4':
        if not current_user_info:
            print('请先登陆。。')
        else:
            add_balance = input('请输入充值金额>>:')

            src_file = db_file
            dst_file = r'%s.swap' % db_file  # 文件修改
            with open(src_file, 'r', encoding='utf-8') as read_file, open(dst_file, 'w',encoding='utf-8') as write_file:
                for line in read_file:
                    user_info_line_list = line.strip('\n').split('|')
                    if user_info_line_list[0] == current_user_info[0]:
                        balance_of_db = str(balance+int(add_balance))
                        user_info_line_list[-1] = balance_of_db
                        line = '|'.join(user_info_line_list) + '\n'

                    write_file.write(line)
            os.remove(src_file)
            os.rename(dst_file, src_file)
            print('充值成功！您的余额为%s'%balance_of_db)