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Day2作业: 购物商城

时间:2016-04-22 06:58:43      阅读:204      评论:0      收藏:0      [点我收藏+]

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实现功能:
1用户登陆:用户名或密码错误判断
2商品清单展示
3查看购物车
4商品加入购物车并更新商品清单
5删除购物车中商品并更新商品清单
6查看已购买记录
7购物车商品支付
8支付时余额不足判断
9支付成功删除购物车中对应商品并更新已购买记录
10用户账户余额查看
11充值功能

 

涉及到4个文件作为库:

 

goods_file   #商品清单
1:小米5:1999:9
2:三星S7:4999:15
3:华为Mate8:3999:12
4:魅族pro6:2499:21
5:苹果6plus:5999:11

gouwuche    #购物车清单
zhy:魅族pro6:1:2499
alex:魅族pro6:1:2499

user_fiel   #用户密码清单
zhy:zhyzhy:2501
alex:123456:5001

yigoushangpin   #已经购买的商品记录
zhy:小米5:3:5997
alex:苹果6plus:2:11998
zhy:苹果6plus:1:5999
zhy:魅族pro6:1:2499

注:每个文件中的每行结尾必须要有换行符‘\n‘

 

流程图

 技术分享

技术分享
  1 #!/usr/bin/env python3
  2 # -*- coding: utf-8 -*-
  3 import codecs
  4 
  5 # 登陆接口,用户名密码都正确登录成功,否则失败
  6 def login(your_name,your_password):
  7     with open(user_file,r) as l:
  8         for line in l:
  9             user_name, user_password, user_balance = line.strip().split(:)
 10             if your_name == user_name and your_password == user_password:
 11                 flag = 1
 12                 break
 13         else:
 14             print(用户名或密码错误)
 15             flag = 0
 16 
 17     return flag
 18 
 19 # 展示商品列表
 20 def show_goods():
 21     print(10** + 商品列表 + 10**)
 22     print(30 * -)
 23     print(| 编号 | 名称 | 价格 | 数量 | )
 24     with codecs.open(goods_file,r,utf-8) as f1:
 25         for line in f1:
 26             goods_id, goods_name, goods_rate, goods_num = line.strip().split(:)
 27             print(30 * -)
 28             print(| %s | %s | %s | %s | %(goods_id, goods_name, goods_rate, goods_num))
 29         print(30*-)
 30     # print(‘购买商品请输入产品编号/返回请输入b/退出请输入q‘)
 31     # the_num = input(‘请选择:‘)
 32 
 33 # 展示购物车
 34 def show_gouwuche(your_name):
 35     with codecs.open(gouwucherutf-8) as f2:
 36         n = 0
 37         print(30 * -)
 38         print(| 编号 | 名称 | 数量 | 总价 | )
 39         for line in f2:
 40             user_name, goods_name, goods_num, goods_rate = line.strip().split(:)
 41             if user_name == your_name:
 42                 n +=1
 43                 print(30*-)
 44                 print(| %s | %s | %s | %s | % (n, goods_name, goods_num, goods_rate))
 45         print(30 * -)
 46 
 47 # 查看当前用户已购产品
 48 def show_yigou(your_name):
 49     with codecs.open(yigoushangpinrutf-8) as f3:
 50         n = 0
 51         print(30 * -)
 52         print(| 编号 | 名称 | 数量 | 总价 | )
 53         for line in f3:
 54             user_name, goods_name, goods_num, goods_rate = line.strip().split(:)
 55             if user_name == your_name:
 56                 n += 1
 57                 print(30 * -)
 58                 print(| %s | %s | %s | %s | % (n, goods_name, goods_num, goods_rate))
 59         print(30 * -)
 60 
 61 # 账户余额查看
 62 def show_money(your_name):
 63     with open(user_filer) as l:
 64         for line in l:
 65             user_name, user_password, user_balance = line.strip().split(:)
 66             if your_name == user_name:
 67                 print(您当前账户余额为:%s % user_balance)
 68                 break
 69 
 70 # 加入购物车,如果购物车中已经存在该商品则将商品数量相加,商品价格相加;如果购物车中不存在该商品,则添加到购物车中。并将可购买商品的库存量
 71 def add_gouwuche(n,your_name):
 72     with codecs.open(goods_filer+utf-8) as f1:
 73         for line1 in f1:
 74             goods_id, goods_name, goods_rate, goods_num = line1.strip().split(:)
 75             if n == goods_id :
 76                 goods_quantity = input(请输入数量:)
 77                 #如果输入的非数字则不合法,输入的数量大于库存,均需要重新输入
 78                 while True:
 79                     if goods_quantity.isdigit():
 80                         if int(goods_num) < int(goods_quantity):
 81                             goods_quantity =input("您输入的数量大于当前库存数量,请重新输入数量:")
 82                         else:
 83                             break
 84                     else:
 85                         goods_quantity = input("您的输入不合法,请重新输入数量:")
 86                 with codecs.open(gouwucher+utf-8) as f2:
 87                     for line2 in f2:
 88                         che_user_name, che_goods_name, che_goods_num, che_goods_rate = line2.strip().split(:)
 89                         # 判断当前选择的商品是否在购物车存在,如果存在标志位che_flag=1
 90                         if your_name == che_user_name and goods_name == che_goods_name:
 91                             che_flag =1
 92                             che_goods_num = str(int(che_goods_num) + int(goods_quantity))
 93                             che_goods_rate = str(int(che_goods_rate)+int(goods_rate)*int(goods_quantity))
 94                             old_line = line2
 95                             new_line = che_user_name + :+ che_goods_name + : + che_goods_num + : + che_goods_rate+\n
 96                             break
 97                     # 当前选择的商品购物车中不存在,标志位che_flag=0
 98                     else:
 99                         che_flag = 0
100                         che_goods_rate = str(int(goods_rate) * int(goods_quantity))
101                         che_goods_num = goods_quantity
102                         che_goods_name = goods_name
103                         che_user_name = your_name
104                         new_line = che_user_name + : + che_goods_name + : + che_goods_num + : + che_goods_rate + \n
105                     # 购物车中存在,则将购物车中的此商品数量更新,总价格更新
106                     if che_flag == 1:
107                         f2.seek(0)
108                         old_gouwuche = f2.read()
109                         new_gouwuche = old_gouwuche.replace(old_line,new_line)
110                         f2.seek(0)
111                         f2.truncate()
112                         f2.write(new_gouwuche)
113                     # 购物车中不存在,则在购物车添加
114                     elif che_flag == 0:
115                         f2.seek(0)
116                         old_gouwuche = f2.read()
117                         new_gouwuche = old_gouwuche+new_line
118                         f2.seek(0)
119                         f2.truncate()
120                         f2.write(new_gouwuche)
121                 #加入购物车后,将商品列表中的数量更新
122                 new_goods_num = str(int(goods_num) - int(goods_quantity))
123                 old_goods_line = line1
124                 new_goods_line = goods_id + : + goods_name + :+ goods_rate + : + new_goods_num + \n
125                 f1.seek(0)
126                 old_goods_file=f1.read()
127                 new_goods_file=old_goods_file.replace(old_goods_line,new_goods_line)
128                 f1.seek(0)
129                 f1.truncate()
130                 f1.write(new_goods_file)
131                 goods_flag = True
132                 break
133         else:
134             goods_flag = False
135             print(抱歉您选择的商品不存在,请重新选择!)
136     return goods_flag
137 
138 # 删除购物车的商品
139 def del_gouwuche(del_gowuche_num,your_name):
140     with codecs.open(gouwuche,r+,utf-8) as f1:
141         while True:
142             n=0
143             for line1 in f1:
144                 user_name, goods_name, goods_num, goods_rate = line1.strip().split(:)
145                 # 判断删除的商品时否存在,若存在删除标志位del_flag = 1
146                 if user_name == your_name:
147                     n += 1
148                     if int(del_gowuche_num) == n:
149                         del_goods_name = goods_name
150                         del_goods_num = goods_num
151                         del_goods_line = line1
152                         del_flag = 1
153                         break
154 
155             # 商品存在,进行删除
156             if del_flag == 1:
157                 f1.seek(0)
158                 gouwuche_file = f1.readlines()
159                 gouwuche_file.remove(del_goods_line)
160                 f1.seek(0)
161                 f1.truncate()
162                 for line in gouwuche_file:
163                     f1.write(line)
164                 # 更新商品清单,将从购物车删除的加到商品清单中
165                 with codecs.open("goods_file",r+,utf-8) as f2:
166                     for line2 in f2:
167                         old_goods_line = list(line2.strip().split(:))
168                         old_line=line2.strip()
169                         if old_goods_line[1] == del_goods_name :
170                             old_goods_line[3] = str(int(old_goods_line[3]) + int(del_goods_num))
171                             new_goods_line = old_goods_line
172                             del_flag =1
173                             break
174                     if del_flag == 1:
175                         f2.seek(0)
176                         new_line= :.join(new_goods_line)
177                         old_goods_file = f2.read()
178                         new_goods_file = old_goods_file.replace(old_line,new_line)
179                         f2.seek(0)
180                         f2.truncate()
181                         f2.write(new_goods_file)
182 
183                 break
184             # 要删除的商品不存在,标志位del_flag = 0
185             else:
186                 del_flag = 0
187                 print("您要删除的商品不存在,请重新输入编号!")
188                 break
189     return del_flag
190 
191 # 支付购物车商品
192 def pay_gouwuche(gowuche_num,your_name):
193     with codecs.open(gouwuche,r+,utf-8) as f1:
194         while True:
195             n=0
196             for line1 in f1:
197                 user_name, goods_name, goods_num, goods_rate = line1.strip().split(:)
198                 # 判断删除的商品时否存在,若存在删除标志位del_flag = 1
199                 if user_name == your_name:
200                     n += 1
201                     if int(gowuche_num) == n:
202                         pay_goods_name = goods_name
203                         pay_goods_num = goods_num
204                         pay_goods_rate = goods_rate
205                         pay_goods_line = line1
206                         # 查看当前用户余额是否能够支付商品
207                         with open(user_filer+) as user_file:
208                             for line in user_file:
209                                 user_name, user_password, user_balance = line.strip().split(:)
210                                 if your_name == user_name:
211                                     old_balance_line = line
212                                     new_balance = int(user_balance) - int(goods_rate)
213                                     break
214                             # 当最终余额小于0时,则表示余额不足
215                             if new_balance < 0:
216                                 print(您的当前余额不足,请充值后再支付!)
217                                 print(\n)
218                                 pay_flag = False
219                                 break
220                             #大于等于0时,则表示可以支付,并更新账户余额
221                             else:
222                                 pay_flag = True
223                                 new_balance_line=user_name + : +user_password + : + str(new_balance) + \n
224                                 user_file.seek(0)
225                                 old_user_file = user_file.read()
226                                 new_user_file = old_user_file.replace(old_balance_line, new_balance_line)
227                                 user_file.seek(0)
228                                 user_file.truncate()
229                                 user_file.write(new_user_file)
230                                 break
231                     else:
232                         pay_flag= ‘‘
233             # 商品存在,支付成功后进行删除
234             if pay_flag == True:
235                 f1.seek(0)
236                 gouwuche_file = f1.readlines()
237                 gouwuche_file.remove(pay_goods_line)
238                 f1.seek(0)
239                 f1.truncate()
240                 for line in gouwuche_file:
241                     f1.write(line)
242                 # 更新已购买商品清单,将已支付的商品加入到已购买的清单中
243                 with codecs.open("yigoushangpin",r+,utf-8) as f2:
244                     for line2 in f2:
245                         old_yigou_line = list(line2.strip().split(:))
246                         old_line=line2.strip()
247                         # 当已购商品清单存在该商品购买记录则将数量相加,总价格相加
248                         if old_yigou_line[1] == pay_goods_name and old_yigou_line[0] == your_name:
249                             old_yigou_line[2] = str(int(old_yigou_line[2]) + int(pay_goods_num))
250                             old_yigou_line[3] = str(int(old_yigou_line[3]) + int(pay_goods_rate))
251                             new_yigou_line = old_yigou_line
252                             f2.seek(0)
253                             new_line = :.join(new_yigou_line)
254                             old_yigou_file = f2.read()
255                             new_yigou_file = old_yigou_file.replace(old_line, new_line)
256                             f2.seek(0)
257                             f2.truncate()
258                             f2.write(new_yigou_file)
259                             break
260                     # 当已购商品清单没有购买记录,则新加购买记录
261                     else:
262                         f2.seek(0)
263                         old_yigou_file = f2.read()
264                         new_yigou_file = old_yigou_file + pay_goods_line
265                         f2.seek(0)
266                         f2.truncate()
267                         f2.write(new_yigou_file)
268                 print(\n)
269                 print("恭喜您,支付成功!")
270                 break
271             elif pay_flag == False:
272                 flag = True
273                 break
274             # 要删除的商品不存在,标志位del_flag = 0
275             else:
276                 pay_flag = False
277                 print("您要支付的商品不存在,请重新输入编号!")
278                 break
279     return pay_flag
280 
281 # 账户充值
282 def add_money(balance_num,your_name):
283     with open(user_file,r+) as f:
284         for line in f:
285             user_name,user_passwd,user_balance=line.strip().split(:)
286             if user_name == your_name:
287                 old_user_line = line
288                 new_user_balance = str(int(user_balance) + int(balance_num))
289                 new_user_line = user_name + : +user_passwd + : + new_user_balance + \n
290                 break
291         f.seek(0)
292         old_user_file =f.read()
293         new_user_file = old_user_file.replace(old_user_line,new_user_line)
294         f.seek(0)
295         f.truncate()
296         f.write(new_user_file)
297 
298 
299 def main():
300     your_name = input("请输入用户名:")
301     your_password = input("请输入密码:")
302     menu_num = ‘‘
303     # 登陆,用户名或密码错误重新输入
304     while True:
305         if login(your_name,your_password):
306             print(欢迎%s登录购物商城 % your_name)
307             print(30 * *)
308             break
309         else:
310             your_name = input("请重新输入用户名:")
311             your_password = input("请重新输入密码:")
312     while True:
313         print(30 * *)
314         print(欢迎来到主菜单,您可进行如下操作!)
315         print(30 * *)
316         print(| 1 商品列表  |  2 查看购物车  |  3 查看已购商品  |  4 账户余额  |  q 退出商城 |)
317         if  menu_num == ‘‘:
318             menu_num = input(请输入:)
319 
320         # 进入商品列表
321         elif menu_num == "1":
322             while True:
323                 show_goods()
324                 print(| 输入商品编号加入购物车| 输入b返回主菜单| 输入q退出商城 |)
325                 your_goods_num = input(请选择:)
326                 print(\n)
327                 # 判断输入的是否为纯数字,如果是
328                 if your_goods_num.isdigit():
329                     while add_gouwuche(your_goods_num,your_name):
330                         # 当商品加入购物车后直接返回给用户购物车
331                         menu_num = 2
332                         break
333                     break
334                 elif your_goods_num == "b":
335                     menu_num = ‘‘
336                     break
337                 elif your_goods_num == "q":
338                     print("您已退出商城!")
339                     exit()
340                 else:
341                     print("您的输入不合法,请重新输入!")
342                     print(\n)
343         # 查看购物车
344         elif menu_num == 2:
345             while True:
346                 print(30 * -)
347                 print("您当前购物车商品如下所示:")
348                 show_gouwuche(your_name)
349                 print("| 1 返回主菜单  |  2 删除商品  |  3 支付商品  |   q 退出商城 |")
350                 gouwuche_menu_num = input("请输入:")
351                 print(\n)
352                 # 返回主菜单
353                 if gouwuche_menu_num == 1:
354                     menu_num = ‘‘
355                     break
356                 # 删除商品
357                 elif gouwuche_menu_num == 2:
358                     while True:
359                         del_gouwuche_num = input(请输入要删除的商品编号,或者输入b返回:)
360                         if del_gouwuche_num == b:
361                             break
362                         elif not del_gouwuche_num.isdigit():
363                             print("您的输入不合法,请重新输入!")
364                             print(\n)
365                             continue
366                         elif del_gouwuche(del_gouwuche_num,your_name):
367                             print("删除成功!")
368                             print(\n)
369                             break
370                 # 支付商品
371                 elif gouwuche_menu_num == 3:
372                     while True:
373                         pay_gouwuche_num = input(请输入要支付的商品编号,返回请输入b:)
374                         if pay_gouwuche_num.isdigit():
375                             if pay_gouwuche(pay_gouwuche_num,your_name):
376                                 break
377                         elif pay_gouwuche_num == b:
378                             break
379                         else:
380                             print("您的输入不合法,请重新输入!")
381 
382                 elif gouwuche_menu_num == q:
383                     print("您已退出商城!")
384                     exit()
385                 else:
386                     print("您的输入不合法,请重新输入!")
387                     print(\n)
388 
389         #查看已购商品记录
390         elif menu_num == 3:
391             print(30 * -)
392             print("您已够买商品如下所示:")
393             show_yigou(your_name)
394             print(| 输入b返回主菜单| 输入q退出程序 |)
395             while True:
396                 yigou_input=input("请输入:")
397                 if yigou_input == b:
398                     menu_num =‘‘
399                     print(\n)
400                     break
401                 elif yigou_input == q:
402                     print("您已退出商城!")
403                     exit()
404                 else:
405                     print("您的输入不合法,请重新输入!")
406                     print(\n)
407 
408         # 查看账户信息
409         elif menu_num == 4:
410             while True:
411                 print(30 * -)
412                 print("您的账户信息如下所示:")
413                 show_money(your_name)
414                 print(| 1 充值账户 | b 返回主菜单 | q 退出商城 | )
415                 money_num =input(请输入:)
416                 if money_num == 1:
417                     print(30**)
418                     add_money_num = input(请输入充值金额,输入b返回:)
419                     if add_money_num.isdigit():
420                         add_money(add_money_num,your_name)
421                         print(恭喜您,充值成功!)
422                         print(\n)
423                         continue
424                     elif add_money_num == b:
425                         continue
426                     else:
427                         print("您的输入不合法,请重新输入!")
428                         print(\n)
429                         continue
430                 elif money_num == b:
431                     menu_num = ‘‘
432                     break
433                 elif money_num == q:
434                     print("您已退出商城!")
435                     exit()
436                 else:
437                     print("您的输入不合法,请重新输入!")
438                     print(\n)
439 
440         elif menu_num == q:
441             print("您已退出商城!")
442             exit()
443         else:
444             print("您的输入不合法,请重新输入!c")
445             print(\n)
446 
447 if __name__ == __main__:
448     main()
View Code

 

Day2作业: 购物商城

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原文地址:http://www.cnblogs.com/zhyErick/p/5419708.html

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