python3 实现简单信用卡管理程序

1、程序执行代码：

#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

2、程序功能函数：

#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!')

3、用户数据文件：

{"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、相关日志内容：

登录日志：

2016-12-20  22:12:18 卡号 005 认证成功!
2016-12-20  22:14:20 卡号 005 认证成功!
2016-12-20  22:17:26 卡号 006 认证成功!
2016-12-20  22:18:06 卡号 005 认证成功!
2016-12-20  22:18:06 卡号 006 认证成功!
2016-12-20  22:21:10 卡号 005 认证失败!
2016-12-20  22:21:10 卡号 006 认证成功!
2016-12-20  22:23:17 卡号 006 认证成功!
2016-12-20  22:25:33 卡号 006 认证成功!
2016-12-20  22:26:14 卡号 006 认证成功!
2016-12-20  22:32:15 卡号 006 认证成功!
2016-12-20  22:44:57 卡号 005 认证成功!
2016-12-20  22:45:50 卡号 006 认证成功!
2016-12-20  22:47:10 卡号 006 认证成功!
2016-12-20  22:48:27 卡号 006 认证成功!
2016-12-20  22:49:30 卡号 006 认证成功!
2016-12-20  22:52:13 卡号 006 认证成功!
2016-12-20  22:53:44 卡号 006 认证成功!

交易日志：

2016-12-20  21:25:35 卡号 006 发起 repayment 业务，金额为： 100
2016-12-20  21:27:01 卡号 005 发起 repayment 业务，金额为： 100 
2016-12-20  22:14:20 卡号 005 发起 repayment 业务，金额为： 100 
2016-12-20  22:17:26 卡号 006 发起 transfer 业务，金额为： 300