如何使用Python3编写信用卡管理程序？

#Author by Andy
#_*_ coding:utf-8 _*_
import os,sys,time
Base_dir=os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.append(Base_dir)
str="欢迎使用银行信用卡自助服务系统！\n"
for i in str:
 sys.stdout.write(i)
 sys.stdout.flush()
 time.sleep(0.3)
while True:
 print("1、管理人员入口。")
 time.sleep(0.3)
 print("2、用户登录入口。")
 print("3、退出请按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("该功能正在建设中，更多精彩，敬请期待！")
  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("欢迎再次使用，再见！")
   Exit_flag = False

#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("请输入卡号和密码进行验证！")
  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 = input('请输入您的卡号:')
   user_pwd = input('请输入您的密码:')
   if user_id in user_data:
    if user_pwd == user_data[user_id]['Password']:
     Log_file.write(start_time + ' 卡号 %s 认证成功!\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 == 'enchashment':
      Bill_log_file.write(start_time + ' 卡号 '+ user_id + ' 发起 ' + func_name + ' 业务，金额为： %s \n' % keywords)
      Bill_log_file.flush()
      time.sleep(1)
      Bill_log_file.close
      return keywords
     else:
      return keywords
    else:
     print('卡号或密码错误！请重新输入！')
     Log_file.write(start_time + ' 卡号 %s 认证失败!\n' % user_id)
     Log_file.flush()
     time.sleep(1)
     Log_file.close
     count +=1
   else:
    print("卡号不存在，请确认！")
   if count == 3:
    print("对不起,您已输错3三次，卡号已锁定！")
    Log_file.write(start_time + ' 卡号 %s 因连续三次验证失败而被锁定！\n' % user_id)
    time.sleep(1)
    Log_file.close
 return wrapper
#定义菜单函数，根据不同用户显示不通菜单。
def menu(choice):
 if choice == '2':
  print( "请选择服务类别:\n"
    "1、查询信用额度。\n"
    "2、信用卡还款。\n"
    "3、信用卡提现。\n"
    "4、修改口令。\n"
    "5、信用卡转账。\n"
    "6、信用卡账单查询。\n"
    "7、轻松购物。\n"
    "8、退出请按q!\n")
  service_items = input('-->')
 elif choice == '1':
  print("请选择服务类别:\n"
    "a、修改用户信用额度。\n"
    "b、新增信用卡用户。\n"
    "c、删除信用卡用户。\n"
    "d、修改用户口令。\n"
    "e、退出请按q!\n")
  service_items = input('-->')
 else:
  print("感谢使用，祝生活愉快！")
  exit()
 return service_items
# 定义备份用户数据文件函数
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")
#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') as 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]['Credit']
 print("您目前的信用额度为：%s元\n"
   %(user_credit))
 time.sleep(2)
 return 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("您目前需要还款金额为：%s元.\n" %user_bill)
 Exit_flag=True
 while Exit_flag:
  repayment_value=input("请输入还款金额：")
  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("恭喜，还款成功！")
   print("您目前需要还款金额为：%s元.\n" % (user_data[user_id]['Credit'] - user_data[user_id]['Balance']))
   time.sleep(1)
   Exit_flag = False
   return repayment_value
  else:
   print("请输入正确的金额！")
#定义信用卡提现函数
@auth
def enchashment():
 user_credit=user_data[user_id]['Credit']
 print("你可用的取现额度为：%s" %user_credit)
 Exit_flag=True
 while Exit_flag:
  enchashment_value=input("请输入您要取现的金额：")
  if enchashment_value.isdigit():
   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(Base_dir + "\data\\user_db.txt", 'r+', encoding='utf-8')
     json.dump(user_data, f)
     f.close()
     print("取现成功，您目前的可用额度为：%s" %user_data[user_id]['Balance'])
     time.sleep(1)
     Exit_flag = False
     return enchashment_value
    else:
     print("您的取现额度必须小于或等于您的信用额度！")
   else:
    print("取现金额必须为100的整数倍！")
  else:
   print("输入有误，取现金额必须为数字，且为100的整数倍")
@auth
#定义信用卡转账函数
def transfer():
 user_balance=user_data[user_id]['Balance']
 print("您目前的可用额度为：%s" %user_balance)
 Exit_flag=True
 while Exit_flag:
  transfer_user_id = input("请输入对方帐号：")
  transfer_value = input("请输入转账金额：")
  if transfer_user_id in user_data.keys():
   while Exit_flag:
    if transfer_value.isdigit():
     while Exit_flag:
      transfer_value=int(transfer_value)
      user_passwd=input("请输入口令以验证身份：")
      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("转账成功，您目前的可用额度为：%s" % user_balance)
       time.sleep(1)
       Exit_flag = False
       return transfer_value
      else:
       print("密码错误，请重新输入！")
    else:
     print("转账金额，必须为数字，请确认！")
  else:
   print("帐号不存在，请确认！")
# @auth
#定义信用卡账单查询函数
@auth
def billing_query():
 print("我们目前仅提供查询所有账单功能！")
 print("您的账单为：\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("您正在修改用户的信用额度！")
 Exit_flag=True
 while Exit_flag:
  target_user_id=input("请输入您要修改的用户卡号：\n")
  if target_user_id in user_data.keys():
   while Exit_flag:
    new_credit=input("请输入新的信用额度：\n")
    if new_credit.isdigit():
     new_credit= int(new_credit)
     user_data[target_user_id]['Credit']=new_credit
     print("卡号 %s 的新信用额度为：%s " %(target_user_id,new_credit))
     choice = input("确认请输入1或者按任意键取消：\n")
     if choice == '1':
      f = open(Base_dir + "\data\\user_db.txt", 'r+', encoding='utf-8')
      json.dump(user_data, f)
      f.close()
      print("信用额度修改成功，新额度已生效！")
      print("卡号 %s 的新信用额度为：%s " % (target_user_id, user_data[target_user_id]['Credit']))
      time.sleep(1)
      Exit_flag = False
     else:
      print("用户的信用额度未发生改变！")
    else:
     print("信用额度必须为数字！请确认！")
  else:
   print("卡号不存在，请确认！")
#定义修改口令函数
@auth
def change_pwd():
 print("注意：正在修改用户密码！")
 Exit_flag = True
 while Exit_flag:
  old_pwd = input("请输入当前密码：")
  if old_pwd == get_user_data()[user_id]["Password"]:
   new_pwd = input("请输入新密码：")
   new_ack = input("请再次输入新密码：")
   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("恭喜，密码修改成功！")
    time.sleep(1)
    Exit_flag = False
   else:
    print("两次密码不一致，请确认！")
  else:
   print("您输入的密码不正确，请在确认！")
#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("Balance:")
  Credit = input("Credit:")
  if Balance.isdigit() and Credit.isdigit():
   Balance = int(Balance)
   Credit = int(Credit)
  else:
   print("余额和信用额度必须是数字！")
   continue
  Name = input("Name:")
  Password = input("Password:")
  print("新增信用卡用户信息为：\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("提交请按1，取消请按2,退出请按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 = open(Base_dir + "\data\\user_db.txt", 'w+', encoding='utf-8')
   json.dump(user_data, f)
   f.close()
   print("新增用户成功！")
   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():
 Exit_flag = True
 while Exit_flag:
  user_id=input("请输入要删除的信用卡的卡号：")
  if user_id == 'q' or user_id == 'Q':
   print('欢迎再次使用，再见！')
   time.sleep(1)
   Exit_flag=False
  else:
   user_data=get_user_data()
   print("新增信用卡用户信息为：\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]['Credit'], user_data[user_id]['Name']))
   choice = input("提交请按1，取消请按2,退出请按q：")
   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("删除用户成功！")
    time.sleep(1)
    Exit_flag = False
   elif choice == '2':
    continue
   elif choice == 'q' or choice == 'Q':
    print('欢迎再次使用，再见！')
    time.sleep(1)
    Exit_flag = False
   else:
    print('Invaliable Options!')

{"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}}