购物车程序

Posted 2020-09-18

 购物车程序

要求:

- 有存放用户信息的文件，三次登录判断用户锁定
- 有商品列表文件，历史记录问题，购物车文件
- 查看商品时要求分页显示，每页显示数量自定义
- 可以查看购物记录

思路：

 

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购物车程序BUG：
1,程序执行完成后，文件没有被更新；
2,在查看历史记录的时候，提示的当前页码数，显示为0，不得不+1

3,没有实现根据关键字搜索功能

代码：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
#
# 读取用户信息
d1 = open(‘user_db‘, ‘r‘, encoding=‘UTF-8‘)
d2 = d1.read()
d1.close()
v1 = d2.split(‘\n‘)
user_list = []
user_balance = []
for i in v1:
    v2 = i.split(‘|‘)
    user_list.append({
        ‘name‘: v2[0],
        ‘pwd‘: v2[1],
        ‘t‘: v2[2],
        ‘balance‘: v2[3]
    })
flag = True
while flag:
    in_user = input(‘请输入用户名(q退出程序):‘)
    if in_user != ‘q‘:
        for item in user_list:
            if in_user == item[‘name‘]:
                if int(item[‘t‘]) < 3:
                    in_pwd = input(‘请输入密码：‘)
                    if in_pwd == item[‘pwd‘]:
                        item[‘t‘] = 0
                        user_balance.append(item[‘balance‘])
                        print(‘登录成功，您的账户余额为:%s‘ % (item[‘balance‘]))
                        flag = False
                        break
                    else:
                        nt = 2 - int(item[‘t‘])
                        print(‘密码错误，还剩%s尝试次数‘ % nt)
                        item[‘t‘] = int(item[‘t‘]) + 1
                        break
                else:
                    print(‘此用户已被锁定‘)
                    exit(‘程序退出‘)
        else:
            print(‘用户不存在，请重新输入：(q退出程序)‘)
    else:
        flag = False
# 读取商品文件信息
a1 = open(‘goods‘, ‘r‘, encoding=‘UTF-8‘)
a2 = a1.read()
a1.close()
# 读取历史文件信息
b1 = open(‘history‘, ‘r‘, encoding=‘UTF-8‘)
b2 = b1.read()
b1.close()
history_list = []
# 读取购物车文件信息
c1 = open(‘cart‘, ‘r‘, encoding=‘UTF-8‘)
c2 = c1.read()
c1.close()
cart_list = []
# 将读取到的商品列表信息转换为一个列表
goods_list = []
goods_1 = a2.split(‘\n‘)
for item_1 in goods_1:
    item_2 = item_1.split(‘:‘)
    goods_list.append({
                    ‘name‘: item_2[0],
                    ‘price‘: item_2[1]
                    })
# 判断当前商品列表页码范围
a = int(len(goods_list))
b = int(a % 10)
c = a // 10
if b != 0:
    d = c + 1
else:
    d = c
# 判断当前历史记录页码范围
e = int(len(history_list))
f = int(e % 10)
g = e // 10
if f != 0:
    h = g + 1
else:
    h = g
# 分页显示列表
flag = True
while flag:
    choice = input(‘1:选购商品;2:删除购物车商品;3:结算购物车商品;4:查看购买记录;q:退出程序\n你的选择是:‘)
    while flag:
        if choice == ‘1‘:
            x = input(‘请输入页码查看商品列表(共%s页;b返回;q退出):‘ % (d,))
            if x.isdecimal():
                x = int(x)
                start = (x - 1) * 10
                end = x * 10
                goods_a = goods_list[start:end]
                goods_list_1 = []
                for i in goods_a:
                    goods_list_1.append(i)
                for j, k in enumerate(goods_list_1, 1):
                    print(j, k)
                while flag:
                    buy_choice = input(‘请选择要购买的商品序号:‘)
                    buy_choice = int(buy_choice) - 1
                    cart_list.append(goods_list_1[buy_choice])
                    print(‘已添加到购物车列表\n已选%s‘ % (cart_list,))
                    break
            elif x == ‘b‘:
                break
            elif x == ‘q‘:
                print(‘程序退出‘)
                exit(‘bye‘)
        elif choice == ‘2‘:
            print(‘当前购物车商品:‘)
            for o, p in enumerate(cart_list, 1):
                print(o, p)
            cart_list_sum1 = 0
            for k in cart_list:
                cart_list_sum1 += int(k[‘price‘])
            print(‘当前购物车商品总金额%s:‘ % (cart_list_sum1,))
            del_choice = input(‘请选择要删除的商品序号(b返回):‘)
            if del_choice != ‘b‘ and int(del_choice) >= 0:
                del_choice = int(del_choice) - 1
                cart_list.remove(cart_list[del_choice])
                print(cart_list)
            else:
                print(‘输入有误‘)
                break
        elif choice == ‘3‘:
            cart_list_sum2 = 0
            for k in cart_list:
                cart_list_sum2 += int(k[‘price‘])
                history_list.append(k)
            print(‘当前购物车商品总金额:%s\n您的账户余额:%s‘ % (cart_list_sum2, user_balance))
            user_balance_int = int(user_balance[0])
            if user_balance_int >= cart_list_sum2:
                user_balance_int -= cart_list_sum2
                print(‘结算成功,当前余额:%s‘ % (user_balance_int,))
                break
            else:
                print(‘余额不足‘)
                break
        elif choice == ‘4‘:
            x1 = input(‘请输入页码查看商品列表(共%s页;b返回;q退出):‘ % (h,))
            if x1.isdecimal():
                x1 = int(x1)
                start = (x1 - 1) * 10
                end = x1 * 10
                history_a = history_list[start:end]
                history_list_1 = []
                for i1 in history_a:
                    history_list_1.append(i1)
                for j1, k1 in enumerate(history_list_1, 1):
                    print(j1, k1)
            #print(history_list)
            break
        elif choice == ‘q‘:
            print(‘一路顺风‘)
            exit(‘bye‘)
        else:
            print(‘抱歉，输入有误‘)
            break
# 更新用户登录信息文件
user_list_new = []
for m in user_list:
    v3 = ‘%s|%s|%s‘ % (m[‘name‘], m[‘pwd‘], m[‘t‘])
    user_list_new.append(v3)
v4 = user_list_new[0] + ‘\n‘ + user_list_new[1]
d3 = open(‘db‘, ‘w‘)
d3.write(v4)
d3.close()
# 更新历史记录文件
history_list_new = []
for n in history_list:
    b3 = ‘%s:%s‘ % (n[‘name‘], n[‘price‘])
    history_list_new.append(b3)
b4 = history_list_new[0] + ‘\n‘ + history_list_new[1]
b5 = open(‘history‘, ‘w‘)
b5.write(b4)
b5.close()
# 更新购物车文件
cart_list_new = []
for o in cart_list:
    c3 = ‘%s:%s‘ % (o[‘name‘], o[‘price‘])
    cart_list_new.append(c3)
c4 = cart_list_new[0] + ‘\n‘ + cart_list_new[1]
c5 = open(‘cart‘, ‘w‘)
c5.write(c4)
c5.close()

--------

附商品列表信息文件goods

USP.45:500
DesertEagle 沙漠之鹰:650
M3 Super90 Combat:1700
AK47:2500
M4A1:3100
AUG A1:3500
ScoutSniperRifle:2750
AWP:4750
M249:5750
Glock18:400
SIG P228:600
M4 Super90 xm1014:3000
MP5 Navy:1500
Steyr TMP:1250
Fabrique Nationale:2350
UMP 45:3500
Mac 10 乌兹:1400
SG-552:3500
SIG 550:4200
Scout:3200