Use Python3 to write simple credit card management programs _python

1, program execution code:

#Author by Andy #_ *_ coding:utf-8 _*_ import os,sys,time base_dir=os.path.dirname (Os.path.dirname (__ file__)) Sys.path.append (Base_dir) str= "Welcome to the bank Credit card self-service system!" \ n "For I in Str:sys.stdout.write (i) Sys.stdout.flush () Time.sleep (0.3) while True:print (" 1), administrative personnel portal. ") Time.sleep (0.3) print (" 2), User login entry. "
  ") Print (" 3, exit Please press q! ") Choice=input (":") from core import, exit_flag=true while Exit_flag:user_choice=main.menu (choice) if use R_choice = ' 1 ': Main.get_user_credit () elif User_choice = = ' 2 ': main.repayment () elif User_choice = ' 3 ': main.enchashment () elif User_choice = = ' 4 ': main.change_pwd () elif User_choice = = ' 5 ': main . Transfer () elif User_choice = = ' 6 ': Main.billing_query () elif user_choice = ' 7 ': Print ("This feature is under construction, more refined Color, please look forward to! ") elif User_choice = = ' A ': Main.change_user_credit () elif User_choice = = ' B ': Main.add_user () Eli F User_choice = = ' C ': Main.del_user () elif User_choice = = ' d ': main.change_pwd () elif user_choice = ' Q ' or user_choice = ' Q ': Prin T ("Welcome to use again, goodbye!") ") Exit_flag = False

2, program function function:

#Author by andy#_*_ coding:utf-8 _* import json,sys,os,time,shutil base_dir=os.path.dirname (Os.path.dirname ( Os.path.abspath (__file__)) sys.path.append (base_dir) #定义认证装饰器 def auth (func): Def wrapper (*args,**kwargs): # Print ( "Please enter the card number and password for verification!"
    ") F = open (base_dir+ ' \data\\user_db.txt ', ' r ') log_file = open (base_dir+ ' \logs\log.txt ', ' + ', encoding= ' utf-8 ') Bill_log_file = open (Base_dir + ' \logs\\bill_log.txt ', ' + ', encoding= ' utf-8 ') Func_name = func.__name__ time_ formate = '%y-%m-%d%x ' start_time = Time.strftime (Time_formate, Time.localtime ()) User_data = Json.load (f) CO Unt=0 while Count < 3:global user_id global user_pwd user_id = input (' Please enter your card number: ') user_pwd = input (' Please enter your password: ') if user_id in user_data:if user_pwd = = user_data[user_id][' Password ']: Log_fi Le.write (start_time + ' card number%s certified successful!\n '% user_id) Log_file.flush () time.sleep (1) log_file.cl OSE keywords= Func (*args, **kwargs) if func_name = = ' repayment ' or func_name = ' transfer ' or func_name = ' enchashment ':
            Bill_log_file.write (start_time + ' card number ' + user_id + ' initiated ' + func_name + ' business, Amount:%s '% keywords) Bill_log_file.flush () time.sleep (1) bill_log_file.close return keywords Els E:return keywords Else:print (' card number or password error! Please re-enter!
          ') log_file.write (start_time + ' card number%s authentication failed!\n '% user_id) Log_file.flush () time.sleep (1) Log_file.close Count +=1 else:print ("card number does not exist, please confirm!") if Count = = 3:print ("Sorry, you have lost 33 times, the card number is locked!") ") Log_file.write (start_time + ' card number%s has been locked for three consecutive validation failures!)
\ n '% user_id) time.sleep (1) log_file.close return wrapper #定义菜单函数, depending on the user to display the menu. Def menu (choice): if choice = = ' 2 ': Print ("Please select the service category: \ n" "1, check the credit limit.) \ n "" 2, credit card repayment. \ n "" 3, credit card present. \ n "" 4, modify password. \N "" 5, credit card transfer. \ n "" 6, credit card billing inquiries. \ n "" 7, easy shopping. \ n "" 8, Exit Please press q!\n ") Service_items = input ('--> ') elif choice = = ' 1 ': Print (" Please select service category: \ n "" A, modify user credit Lines. \ n "" B, new credit card users. \ n "" C, remove credit card users. \ n "" D, modify user password. \ n "" "E, exit Please press q!\n") Service_items = input ('--> ') else:print ("Thank you for using, I wish a happy life!") ") exit () return Service_items # define backup user data file function def back_up_file (): time_formate = '%y-%m-%d ' sys_time = time.strf Time (Time_formate, Time.localtime ()) shutil.copy (Base_dir + "\data\\user_db.txt", Base_dir + "\data\\user_db--" + Sys_t IME + ". Bak.txt") #定义获取用户数据信息函数 def Get_user_data (): With open (Base_dir + "\data\\user_db.txt", ' r+ ', encoding= ' utf-8 ') s f:user_data = Json.load (f) return user_data #定义用户数据变量 user_data = Get_user_data () #定义查询信用额度函数 @auth def get_user_ Credit (): user_credit=user_data[user_id][' credits '] print ("You are currently in line:%s $ \ n"% (User_credit)) Time.sleep (2) Retu
 RN User_credit #定义信用卡还款函数 @auth def repayment (): User_data = Get_user_data () user_credit=int (user_data[user_id][' credit ') User_balance=int (user_data[user_id][' Balance ']) User_bill = user_credit-user_balance print ("You are currently required to repay the amount:%s Yuan. \ n"%user_bill) exit_flag=true while Exit_
      Flag:repayment_value=input ("Please enter repayment amount:") if Repayment_value.isdigit (): Repayment_value=int (Repayment_value) user_data[user_id][' Balance '] = user_data[user_id][' Balance '] + repayment_value f = open (Base_dir + "\data\\use R_db.txt ", ' r+ ', encoding= ' Utf-8 ') json.dump (User_data, F) f.close () print (" Congratulations, repayment success! ")
      ") Print (" The amount you currently need to repay is:%s Yuan. \ n "% (user_data[user_id][' credit '-user_data[user_id][' Balance ')) Time.sleep (1) Exit_flag = False return repayment_value else:print ("Please enter the correct amount!") ") #定义信用卡提现函数 @auth def enchashment (): user_credit=user_data[user_id][' credit '] print (" The amount of cash you can use is:%s "%user_credit) E Xit_flag=true while Exit_flag:enchashment_value=input ("Please enter the amount you want to withdraw:") if EnchaShment_value.isdigit (): Enchashment_value=int (enchashment_value) if enchashment_value% = = 0:if E Nchashment_value <= user_credit:user_data[user_id][' Balance ' = User_credit-enchashment_value f
          = Open (Base_dir + "\data\\user_db.txt", ' r+ ', encoding= ' Utf-8 ') json.dump (User_data, F) f.close ()
          Print ("Successful, your current available amount is:%s"%user_data[user_id][' Balance ']) time.sleep (1) exit_flag = False return Enchashment_value else:print ("Your amount of cash must be less than or equal to your credit limit!") Else:print ("The cash amount must be 100 integer times!"). "Else:print (" input is incorrect, the cash amount must be a number, and is 100 integer times ") @auth #定义信用卡转账函数 def transfer (): user_balance=user_data[user_id][' B Alance '] Print ("Your current available amount is:%s"%user_balance) exit_flag=true while exit_flag:transfer_user_id = input ("Please enter the account number:" Transfer_value = input ("Please enter transfer amount:") if transfer_user_id in User_data.keys (): While Exit_flag:if tr Ansfer_value.isdigit (): While Exit_flag:transfer_value=int (Transfer_value) user_passwd=input ("Please enter password to verify identity:")
              if user_passwd = = user_data[user_id][' Password ': user_balance = User_balance-transfer_value
              user_data[transfer_user_id][' Balance ']=int (user_data[transfer_user_id][' Balance ') + Transfer_value
              f = open (Base_dir + "\data\\user_db.txt", ' r+ ', encoding= ' Utf-8 ') json.dump (User_data, F) F.close () print ("Transfer successful, your current available amount is:%s"% user_balance) time.sleep (1) exit_flag = Fa LSE return Transfer_value Else:print ("Password error, please re-enter!") Else:print ("Transfer amount, must be a number, please confirm!") Else:print ("The account does not exist, please confirm!") ") # @auth #定义信用卡账单查询函数 @auth def billing_query (): Print (" We currently offer only query-all billing features! " ") Print (" Your bill is: \ n ") Bill_log_file = open (Base_dir + ' \logs\\bill_log.txt ', ' R ', encoding= ' utf-8 ') for lines in bill _log_file:if user_id in Lines:print (Lines.strip ()) print () time.sleep (1) #定义修改信用卡额度函数 def change_user_credit (): Print (" You are modifying the user's credit limit! ") Exit_flag=true while Exit_flag:target_user_id=input (" Please enter the user card number you want to modify: \ n ") if target_user_id in User_data.keys  (): While Exit_flag:new_credit=input ("Please enter a new credit limit: \ n") if New_credit.isdigit (): new_credit= Int (new_credit) user_data[target_user_id][' Credit ']=new_credit print (the new credits for card number%s is:%s)% (target_use R_id,new_credit) Choice = input ("Confirm please enter 1 or press any key to cancel: \ n") if choice = = ' 1 ': F = open (Base_dir + "\data\\user_db.txt", ' r+ ', encoding= ' Utf-8 ') json.dump (User_data, F) f.close () Prin T ("The credit limit has been revised successfully, the new limit has come into effect!") ") print (the new credit limit for card number%s is:%s% (target_user_id, user_data[target_user_id][' credits ')) Time.sleep (1 Exit_flag = False Else:print ("The user's credit limit has not changed!") ") Else:print ("Credit limit must be a number! Please confirm! Else:print ("card number does not exist, please confirm!") #定义修改口令函数 @auth def change_pwd (): Print (note: modifying user password!) ") Exit_flag = True while exit_flag:old_pwd = input (" Please enter current password: ") if old_pwd = = Get_user_data () [user_id][] Passw Ord "]: New_pwd = input (" Please enter new password: ") New_ack = input (" Please enter new password again: ") if new_pwd = = New_ack:user_data= Get_user_data () user_data[user_id]["Password"]=new_pwd f = open (Base_dir + "\data\\user_db.txt", ' r+ ', enc oding= ' Utf-8 ') json.dump (User_data, F) f.close () print ("Congratulations, password modification successful!") ") Time.sleep (1) exit_flag = False else:print (" Two times password inconsistent, please confirm! ") Else:print ("The password you entered is incorrect, please confirm it!") ") #定义新增信用卡函数 def add_user (): Exit_flag = True while exit_flag:user_id = input (" user_id: ") Balance = input (" B
      Alance: ") credit = input (" Credit: ") if Balance.isdigit () and Credit.isdigit (): Balance = Int (Balance) credit = Int (credits) else:print ("The balance and line must be numbers!")
 ")     Continue Name = input ("Name:") Password = input ("Password:") print ("New credit card user information is: \ n" "user_id:%s\n" "Balance:%s\n" "credit:%s\n" "name:%s\n" "password:%s\n"% (user_id, Balance, credit, Na Me, Password)) choice = input ("Submit please press 1, cancel please press 2, exit please press Q:") if choice = = ' 1 ': Back_up_file () user_data=get_use R_data () user_data[user_id] = {"Balance": Balance, "credit": Credit, "name": Name, "Password": Password} f = O Pen (base_dir + "\data\\user_db.txt", ' w+ ', encoding= ' Utf-8 ') json.dump (User_data, F) f.close () print ("Add User success! ") Time.sleep (1) exit_flag=false elif choice = = ' 2 ': continue elif choice = ' Q ' or choice = = ' Q ': Time.sleep (1) exit_flag = False else:print (' invaliable options! ') #定义删除信用卡函数 def del_user (): E Xit_flag = True while Exit_flag:user_id=input ("Enter the card number of the credit card to be deleted:") if user_id = = ' Q ' or user_id = = ' Q ': Prin T (' Welcome to use again, bye!
   ')   Time.sleep (1) exit_flag=false else:user_data=get_user_data () print ("New credit card user information is: \ n" "Use r_id:%s\n "" balance:%s\n "" credit:%s\n "" name:%s\n "% (user_id, user_data[user_id][' Ba Lance '], user_data[user_id][' credit ', user_data[user_id][' Name ')) choice = input ("Submit please press 1, cancel please press 2, exit please press Q:") if CH Oice = = ' 1 ': Back_up_file () User_data.pop (user_id) f = open (Base_dir + "\data\\user_db.txt", ' w+ ', encoding= ' Utf-8 ') json.dump (User_data, F) f.close () print ("Delete user succeeded!") ") Time.sleep (1) exit_flag = False elif Choice = = ' 2 ': continue elif choice = = ' Q ' or Choice = = ' Q ': print (' Welcome to use again, goodbye! ') Time.sleep (1) exit_flag = False else:print (' invaliable options! ')

3, User data files:

{"003": {"name": "Wangwu", "Password": "Qazwsx", "credit": 16000, "Balance": 8000}, "004": {"name": "Zhaoliu", "Password": "EDCRFV", "credit": 18000, "Balance": 6000}, "002": {"Name": "Lisi", "Password": "123456", "credit": 14000, "Balance": 10 "009": {"Password": "qwerty", "name": "Hanmeimei", "credit": 15000, "Balance": 15000}, "005": {"name": "Fengqi", "Pa ssWOrd ": 1234qwer", "credit": 15000, "Balance": 10700}, "010": {"Name": "Lilei", "Password": "qaswed", "credit": 50000, " Balance ": 50000}," 008 ": {" name ":" Zhengshi "," Password ":" 123456 "," credit ": 12345," Balance ": 12345}," 006 ": {" name ":" Z Houba "," Password ":" 123456 "," credit ": 20000," Balance ": 8300}," 001 ": {" Name ":" Zhangsan "," Password ":" abcd1234 "," cred " It ": 12000," Balance ": 12000}," 007 ": {" Name ":" Wujiu "," Password ":" 123456 "," credit ": 20000," Balance ": 11243}}

4, related log content:

Login log:

2016-12-20 22:12:18 Card number 005 Certification success!
2016-12-20 22:14:20 Card number 005 Certification success!
2016-12-20 22:17:26 Card number 006 Certification success!
2016-12-20 22:18:06 Card number 005 Certification success!
2016-12-20 22:18:06 Card number 006 Certification success!
2016-12-20 22:21:10 Card number 005 certification failed!
2016-12-20 22:21:10 Card number 006 Certification success!
2016-12-20 22:23:17 Card number 006 Certification success!
2016-12-20 22:25:33 Card number 006 Certification success!
2016-12-20 22:26:14 Card number 006 Certification success!
2016-12-20 22:32:15 Card number 006 Certification success!
2016-12-20 22:44:57 Card number 005 Certification success!
2016-12-20 22:45:50 Card number 006 Certification success!
2016-12-20 22:47:10 Card number 006 Certification success!
2016-12-20 22:48:27 Card number 006 Certification success!
2016-12-20 22:49:30 Card number 006 Certification success!
2016-12-20 22:52:13 Card number 006 Certification success!
2016-12-20 22:53:44 Card number 006 Certification success!

Transaction log:

2016-12-20 21:25:35 card number 006 launched repayment business, the amount is: 100
2016-12-20 21:27:01 Card number 005 launched repayment business, the amount is: 100
2016-12-20 22:14:20 Card number 005 launched repayment business, the amount is: 100
2016-12-20 22:17:26 card number 006 launched transfer business, the amount is: 300

The above is a small set to introduce the use of Python3 to write a simple credit card management procedures, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!