Python3 implements simple credit card management procedures and python3 credit card

Python3 implements simple credit card management procedures and python3 credit card

1. Program Execution Code:

# Author by Andy # _ * _ coding: UTF-8 _ * _ import OS, sys, timeBase_dir = OS. path. dirname (OS. path. dirname (OS. path. abspath (_ 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. Administrator portal. ") Time. sleep (0.3) print (" 2. User Logon portal. ") Print (" 3. to exit, press q! ") Choice = input (": ") from core import main Exit_flag = True while Exit_flag: user_choice = main. menu (choice) if user_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 function Construction in progress. More highlights coming soon! ") Elif user_choice = 'A': main. change_user_credit () elif user_choice = 'B': main. add_user () elif user_choice = 'C': main. del_user () elif user_choice = 'D': main. change_pwd () elif user_choice = 'q' or user_choice = 'q': print ("welcome to use it again. Goodbye! ") Exit_flag = False

2. program functions:

# Author by Andy # _ * _ coding: UTF-8 _ * import json, sys, OS, time, shutilBase_dir = OS. path. dirname (OS. path. dirname (OS. path. abspath (_ file _) sys. path. append (Base_dir) # define the authenticator def auth (func): def wrapper (* args, ** kwargs): # print ("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', 'a + ', encoding = 'utf-8') Bill_log_file = open (Base_dir + '\ logs \ bill_log.txt', 'a + ', 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) count = 0 while count <3: global user_id global user_pwd user_id = Indium Ut ('enter your card number: ') user_pwd = input (' enter your password: ') if user_id in user_data: if user_pwd = user_data [user_id] ['Password']: Log_file.write (start_time + 'Card Number % s authentication successful! \ N' % user_id) Log_file.flush () time. sleep (1) Log_file.close keywords = func (* args, ** kwargs) if func_name = 'repayment' or func_name = 'transfer' or func_name = 'enableshment ': bill_log_file.write (start_time + 'Card number '+ user_id +' '+ func_name +' business, amount: % s \ n' % keywords) Bill_log_file.flush () time. sleep (1) Bill_log_file.close return keywords else: print ('Card number or Password error! Enter again! ') 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 ("the card number does not exist. Please confirm! ") If count = 3: print (" Sorry, you have entered the error three times and the card number is locked! ") Log_file.write (start_time + 'Card Number % s is locked because the verification fails three times in a row! \ N' % user_id) time. sleep (1) Log_file.close return wrapper # define the menu function. Different users cannot access the menu. Def menu (choice): if choice = '2': print ("Select Service category: \ n" "1. query the credit limit. \ N "2. Credit card repayment. \ N "" 3. Credit card withdrawal. \ N "" 4. Change the password. \ N "" 5. Credit card transfers. \ N "" 6. query credit card bills. \ N "" 7. easy shopping. \ N "" 8. to exit, press q! \ N ") service_items = input ('-->') elif choice = '1': print (" Select Service category: \ n "" a. Modify user credit limit. \ N "" B. new credit card users. \ N "" c. delete a credit card user. \ N "" d. Modify the user password. \ N "" e, exit, please press q! \ N ") service_items = input ('-->') else: print (" thanks for your use. Have a good life! ") Exit () return service_items # define the backup user data file function def back_up_file (): Time_formate = '% Y-% m-% d' Sys_time = time. strftime (Time_formate, time. localtime () shutil. copy (Base_dir + "\ data \ user_db.txt", Base_dir + "\ data \ user_db --" + Sys_time + ".bak.txt") # define the function for Obtaining user data information def get_user_data (): with open (Base_dir + "\ data \ user_db.txt", 'r + ', encoding = 'utf-8') as f: user_data = json. load (f) return user_data # define user data changes User_data = get_user_data () # define the query Credit Limit Function @ authdef get_user_credit (): user_credit = user_data [user_id] ['credentials'] print ("your current Credit limit is: % s RMB \ n "% (user_credit) time. sleep (2) return user_credit # define the Credit card repayment function @ authdef repayment (): user_data = get_user_data () user_credit = int (user_data [user_id] ['credentials']) user_balance = int (user_data [user_id] ['balance ']) user_bill = user_credit-user_balance print ("the amount you need to pay now is: % s. \ n "% User_bill) Exit_flag = True while Exit_flag: repayment_value = input ("Enter the 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 \ user_db.txt", 'r + ', encoding = 'utf-8') json. dump (user_data, f) f. close () print ("congratulations, payment successful! ") Print (" the current repayment amount is: % s. \ n "% (user_data [user_id] ['credentials']-user_data [user_id] ['balance ']) time. sleep (1) Exit_flag = False return repayment_value else: print ("enter the correct amount! ") # Define the Credit card withdrawal function @ authdef enchashment (): user_credit = user_data [user_id] ['credentials'] print (" Your available Credit limit is % s "% user_credit) exit_flag = True while Exit_flag: enchashment_value = input ("Enter the amount you want to withdraw:") if then (): enchashment_value = int (enchashment_value) if enchashment_value % 100 = 0: if enchashment_value <= user_credit: user_data [user_id] ['balance '] = user_credit-enchashment_value f = open (Ba Se_dir + "\ data \ user_db.txt", 'r + ', encoding = 'utf-8') json. dump (user_data, f) f. close () print ("obtained successfully. Your current available quota is: % s" % user_data [user_id] ['balance ']) time. sleep (1) Exit_flag = False return enchashment_value else: print ("your credit limit must be less than or equal to your credit limit! ") Else: print (" the withdrawal amount must be an integer multiple of 100! ") Else: print (" incorrect input. The withdrawal amount must be a number and an integer multiple of 100 ") @ auth # define the credit card transfer function def transfer (): user_balance = user_data [user_id] ['balance '] print ("your current available quota is: % s" % user_balance) Exit_flag = True while Exit_flag: transfer_user_id = input ("Enter the recipient's account:") transfer_value = input ("Enter the transfer amount:") if transfer_user_id in user_data.keys (): while Exit_flag: if transfer_value.isdigit (): while Exit_flag: transfer_value = int (transfer_value) user_p Asswd = input ("enter the Password for authentication:") 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 quota is: % s" % user_balance) time. sleep (1) Exit_flag = False retur N transfer_value else: print ("the password is incorrect. Please enter it again! ") Else: print (" transfer amount, which must be a number. Please confirm! ") Else: print (" the account does not exist. Please confirm! ") # @ Auth # define the credit card bill query function @ authdef billing_query (): print (" currently, only all bills can be queried! ") 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) # define the function of modifying the credit card quota def change_user_credit (): print ("You are modifying your credit limit! ") Exit_flag = True while Exit_flag: target_user_id = input (" Enter the user ID you want to modify: \ n ") if target_user_id in user_data.keys (): while Exit_flag: new_credit = input ("enter a new credit limit: \ n") if new_credit.isdigit (): new_credit = int (new_credit) user_data [target_user_id] ['credentials'] = new_credit print ("the new Credit line for the card number % s is % s" % (target_user_id, new_credit )) choice = input ("Confirm 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 () print ("the credit line has been modified successfully, and the new credit line has taken effect! ") Print (" the new Credit line for the card number % s is: % s "% (target_user_id, user_data [target_user_id] ['credentials']) time. sleep (1) Exit_flag = False else: print ("your credit limit has not changed! ") Else: print (" the credit limit must be a number! Please confirm! ") Else: print (" the card number does not exist. Please confirm! ") # Define the password modification function @ authdef change_pwd (): print (" NOTE: Changing the user password! ") Exit_flag = True while Exit_flag: old_pwd = input (" Enter the current Password: ") if old_pwd = get_user_data () [user_id] [" Password "]: new_pwd = input ("Enter the new password:") new_ack = input ("Enter the 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 + ', encoding = 'utf-8') json. dump (user_data, f) f. close () print ("congratulations, password changed! ") Time. sleep (1) Exit_flag = False else: print (" the two passwords are inconsistent. Please confirm! ") Else: print (" the password you entered is incorrect. Please confirm it! ") # Define the new credit card function def add_user (): Exit_flag = True while Exit_flag: user_id = input (" user_id: ") Balance = input (" Balance :") credit = input ("Credit:") if Balance. isdigit () and Credit. isdigit (): Balance = int (Balance) Credit = int (Credit) else: print ("the Balance and Credit limit must be numbers! ") Continue Name = input (" Name: ") Password = input (" Password: ") print (" added credit card user information: \ n "" User_id: % s \ n "" Balance: % s \ n "" Credit: % s \ n "" Name: % s \ n "" Password: % s \ n "% (user_id, Balance, Credit, Name, Password) choice = input (" submit press 1, cancel press 2, exit press q :") if choice = '1': back_up_file () user_data = get_user_data () user_data [user_id] = {"Balance": Balance, "Credit": Credit, "Name": Name, "Password": Password} f = op En (Base_dir + "\ data \ user_db.txt", 'W + ', encoding = 'utf-8') json. dump (user_data, f) f. close () print ("added user successfully! ") Time. sleep (1) Exit_flag = False elif choice = '2': continue elif choice = 'q' or choice = 'q': time. sleep (1) Exit_flag = False else: print ('valiable Options! ') # Define the function of deleting a credit card def del_user (): Exit_flag = True while Exit_flag: user_id = input ("Enter the ID of the credit card to be deleted :") if user_id = 'q' or user_id = 'q': print ('Welcome to use it again, goodbye! ') Time. sleep (1) Exit_flag = False else: user_data = get_user_data () print ("added credit card user information: \ n" "User_id: % s \ n" "Balance: % s \ n "" Credit: % s \ n "" Name: % s \ n "% (user_id, user_data [user_id] ['balance '], user_data [user_id] ['credentials'], user_data [user_id] ['name']) choice = input ("Press 1 for submission, press 2 for cancellation, and press q:" For logout :") if choice = '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 ("User deleted! ") Time. sleep (1) Exit_flag = False elif choice = '2': continue elif choice = 'q' or choice = 'q': print ('Welcome to use it 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": 10000}, "009": {"Password": "qwerty", "Name": "hanmeimei", "Credit": 15000, "Balance": 15000}, "005": {"Name": "fengqi", "Password": "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": "zhouba", "Password": "123456", "Credit": 20000, "Balance": 8300}, "001": {"Name": "zhangsan", "Password": "abcd1234", "Credit": 12000, "Balance": 12000}, "007": {"Name": "wujiu", "Password": "123456", "Credit": 20000, "Balance": 11243}}

4. Related log Content:

Logon log:

22:12:18, card No. 005 certification successful!
22:14:20, card No. 005 certification successful!
22:17:26 card No. 006 certification successful!
22:18:06, card No. 005 certification successful!
22:18:06 card No. 006 certification successful!
22:21:10 certification failed on card No. 005!
22:21:10 card No. 006 certification successful!
22:23:17 card No. 006 certification successful!
22:25:33 card No. 006 certification successful!
22:26:14 card No. 006 certification successful!
22:32:15 card No. 006 certification successful!
22:44:57, card No. 005 certification successful!
22:45:50 card No. 006 certification successful!
22:47:10 card No. 006 certification successful!
22:48:27 card No. 006 certification successful!
22:49:30 card No. 006 certification successful!
22:52:13 card No. 006 certification successful!
22:53:44 card No. 006 certification successful!

Transaction log:

21:25:35 on the card No. 006 initiated the repayment business, amounting to: 100
21:27:01 on the card No. 005 initiated the repayment business, amounting to: 100
22:14:20 on the card No. 005 initiated the repayment business, amounting to: 100
22:17:26 on the card number 006 initiated the transfer business, amounting to: 300