简易银行系统，学习Python需要走的必经之路— _ —

简易的银行系统

1、需要分好创建的类，简易的银行系统分为五大块：用户的类、银行卡的类、管理的类、bank操作的类、atm类。(最好分五个文件创建 这样看着清楚好操作。)
2、分好类后确定每个类的属性和方法（函数）
下面就是各种源代码：

### 用户类：
import  os
import pickle
class User():
    def __init__(self,name,uid,card):
        self.uid = uid         # 身份证 
        self.name = name		#用户名
        self.card = card			# 银行卡
    def __str__(self):
        return "姓名{}，身份证{}，卡号{}，密码{}".format(self.name,self.uid,self.card.cid,self.card.pwd)

    ###  将用户对象保存到文件中
    @staticmethod
    def save_user(userinfo):
        pathname = os.path.join(os.getcwd(),'userinfo.db')
        with open(pathname,'wb') as fp:
            pickle.dump(userinfo,fp)

    ###  从文件中取出用户对象
    @staticmethod
    def load_user():
        pathname = os.path.join(os.getcwd(),'userinfo.db')
        if os.path.exists(pathname):
            with open(pathname,'rb') as fp:
                userinfo = pickle.load(fp)
            return userinfo
        else:
            return {}
print(os.getcwd())

#银行卡的类
class Card():
    def __init__(self,cid,pwd):
        self.cid= cid    			  # 卡号
        self.pwd = pwd          # 密码
        self.money = 0          # 余额
        self.is_lock = False    # 是否锁定

# 管理的类
class Admin():
    def __init__(self,admin='1',password='1'):
        self.admin = admin
        self.password = password
        ##  显示欢迎页面
    def welcome(self):
        print("*"*30)
        print(" "*6+"欢迎使用锐士银行")
        print("*"*30)
        ##  登录界面
    def login(self):
        admin = input("请输入管理员账号：")
        password = input("请输入管理员密码：")
        if  admin == '1' and password == '1':
            return True
        return False
        ##  操作菜单
    def menu(self):
        print("*" * 30)
        print("开户[1] 销户[2] 查询[3] 存款[4]")
        print("取款[5] 转账[6] 改密[7] 锁定[8]")
        print("解锁[9] 退出[0] 显示所有用户[10]")
        print("*" * 30)

#bank操作的类
from user import User
from  admin import Admin
from atm import Atm
if __name__ == "__main__":
	##  创建管理员对象
    admin = Admin()
    count = 0
    while True:
    	#展示欢迎页面
        admin.welcome()
        # 展示登录页面
        ret = admin.login()
        if ret:
            print('登陆成功')
            userinfo = User.load_user()
            #  创建atm对象
            atm = Atm(userinfo)
            #定义变量（为了彻底退出while循环）
            is_quit = False
            while True:
            	# 显示操作菜单
                admin.menu()
                num = int(input('请输入你的操作：'))
                if num == 0:
                    print('彻底退出')
                    is_quit = True
                    break
                elif  num == 1:
                    atm.new_user()
                elif  num ==2:
                    atm.del_user()
                elif  num ==3:
                    atm.query_money()
                elif  num ==4:
                    atm.save_money()
                elif  num ==5:
                    atm.get_money()
                elif  num ==6:
                    atm.pass_money()
                elif  num ==7:
                    atm.change_pwd()
                elif  num ==8:
                    atm.lock_user()
                elif  num ==9:
                    atm.unlock_user()
                elif  num ==10:
                    atm.show_user()
            if is_quit:
                break
        else:
            print('账号或者密码错误')
            count += 1
            if  count >2:
                print('密码错误达到上限，禁止登陆')
                break

ATM操作的类
from  user import User
from  card import  Card
from 随机生成卡号和md5加密 import Help
class Atm():
    def __init__(self,userinfo = {}):
        self.userinfo = userinfo
    def new_user(self):
        name = input("请输入用户名：")
        uid = input("请输入身份证：")
        pwd = input("请输入密码:")
        #  可以对密码加密（让密码更安全 需要用到加密模块 我会放在最后给出源代码  可以选择是否加密）
        # pwd = Help.generate_password(pwd)
        # 生成卡号
        cid  = Help.generate_cid()
        card = Card(cid,pwd)
        user = User(name,uid,card)
        #将用户信息添加到字典里
        self.userinfo[cid] = user
        #保存所有用户信息
        User.save_user(self.userinfo)
        print("开户成功")
    def del_user(self):
        cid = input("请输入你的卡号:")
        user = self.userinfo.get(cid)
        if user:
            if user.card.is_lock:
                print('该卡被锁定，请先解锁')
                return
            count = 0
            while count < 2:
                pwd = input("请输入你的密码：")
                if pwd == user.card.pwd:  #if Help.check_password(pwd,user.card.pwd):
                    del self.userinfo[cid]
                    User.save_user(self.userinfo)
                    print('销户成功')
                    break
                else:
                    count+=1
                    print("密码错误")
            else:
                user.card.is_lock = True
                User.save_user(self.userinfo)
                print("密码错误超过上限，改卡被冻结")
        else:
            print("该卡号不存在")

    def query_money(self):
        cid = input("请输入你的卡号：")
        user = self.userinfo.get(cid)
        if  user:
            if user.card.is_lock:
                print("改卡已锁定，请先解锁")
            print("您的余额：￥{}".format(user.card.money))
        else:
            print("该卡号不存在")
    def save_money(self):
        cid = input("请输入你的卡号：")
        user = self.userinfo.get(cid)
        if user:
            if user.card.is_lock:
                print("请解锁")
                return
            count = 0
            while count < 3:
                pwd = input("请输入密码：")
                if pwd == user.card.pwd :
                    money = int(input("请输入金额："))
                    user.card.money += money
                    User.save_user(self.userinfo)
                    print("存款成功")
                    break
                else:
                    count += 1
                    print("密码错误")
            else:
                user.card.is_lock = True
                User.save_user(self.userinfo)
                print("密码错误超过上限，已冻结")
        else:
            print("该卡号不存在")
    def  get_money(self):
        cid = input("请输入您的卡号：")
        user = self.userinfo.get(cid)
        if user:
            if user.card.is_lock:
                print("改卡被冻结，请解锁")
                return
            count = 0
            while count < 3:
                pwd =input("请输入你的密码")
                if pwd == user.card.pwd:
                    money = int(input("请输入你要取得金额"))
                    if  money < user.card.money :
                        user.card.money -= money
                        User.save_user(self.userinfo)
                        print("取款成功，余额：{}".format(user.card.money))
                        break
                    else:
                        print("余额不足，请充值")
                else:
                    count+=1
                    print("密码错误")
            else:
                user.card.is_lock = True
                User.save_user(self.userinfo)
                print("密码错误炒作上限，改卡被冻结")
        else:
            print("该卡号不存在或者输入错误")
    def  pass_money(self):
        cid = input("请输入您的卡号：")
        user = self.userinfo.get(cid)
        if user:
            if user.card.is_lock:
                print("改卡被冻结，请解锁")
                return
            count = 0
            while count < 3:
                pwd =input("请输入你的密码")
                if pwd == user.card.pwd:
                   dt_cid = input("请输入转账账号：")
                   dt_user = self.userinfo.get(dt_cid)
                   if dt_cid:
                       money = int(input("请输入转账金额："))
                       if money < user.card.money:
                           user.card.money -= money
                           dt_user.card.money += money
                           User.save_user(self.userinfo)
                           print("转账成功")
                           break
                       else:
                           print("余额不足")
                   else:
                       print("收款人卡号错误")
                else:
                    count+=1
                    print("密码错误")
            else:
                user.card.is_lock = True
                User.save_user(self.userinfo)
                print("密码错误炒作上限，改卡被冻结")
        else:
            print("该卡号不存在或者输入错误")
    def  change_pwd(self):
        cid = input("请输入您的卡号：")
        user = self.userinfo.get(cid)
        if user:
            if user.card.is_lock:
                print("改卡被冻结，请解锁")
                return
            count = 0
            while count < 3:
                pwd =input("请输入你的密码")
                if pwd == user.card.pwd:
                    new_pwd = input("请输入新密码：")
                    user.card.pwd = new_pwd
                    User.save_user(self.userinfo)
                    print("修改成功")
                    break
                else:
                    count+=1
                    print("密码错误")
            else:
                user.card.is_lock = True
                User.save_user(self.userinfo)
                print("密码错误炒作上限，改卡被冻结")
        else:
            print("该卡号不存在或者输入错误")
    def  lock_user(self):
        cid = input("请输入您的卡号：")
        user = self.userinfo.get(cid)
        if user:
            if user.card.is_lock:
                print("改卡被冻结，请解锁")
                return
            count = 0
            while count < 3:
                pwd = input("请输入你的密码")
                if pwd == user.card.pwd:
                    user.card.is_lock = True
                    User.save_user(self.userinfo)
                    print("冻结成功")
                    break
                else:
                    count += 1
                    print("密码错误")
            else:
                user.card.is_lock = True
                User.save_user(self.userinfo)
                print("密码错误炒作上限，改卡被冻结")
        else:
            print("该卡号不存在或者输入错误")
    def  unlock_user(self):
        cid = input("请输入您的卡号：")
        user = self.userinfo.get(cid)
        if user:
            if user.card.is_lock:
                print("改卡被冻结，请解锁")
                return
            count = 0
            while count < 3:
                pwd = input("请输入你的密码")
                if pwd == user.card.pwd:
                    user.card.is_lock = False
                    User.save_user(self.userinfo)
                    print("解冻成功")
                    break
                else:
                    count += 1
                    print("密码错误")
            else:
                user.card.is_lock = True
                User.save_user(self.userinfo)
                print("密码错误炒作上限，改卡被冻结")
        else:
            print("该卡号不存在或者输入错误")
    def show_user(self):
        for user in self.userinfo:
            print(self.userinfo[user])

上面我提到的密码加密情况可以根据自得需要来决定：如果不需要加密直接在后面的判断密码代码里直接判断 ： if pwd == user.card.pwd:。如果需要加密，在后面判断密码的代码需要改变判断：if Help.check_password(pwd,user.card.pwd):

#随机的银行卡号 和  md5加密 和 解密
from random import randint
import hashlib
class Help():
    @staticmethod
    #生成随机银行卡号
    def generate_cid(length=8):
        cid =''
        for i in range(length):
            cid += str(randint(0,9))
        return cid
    #  生成md5加密后的内容
    @staticmethod
    def generate_password(password):
    	# 创建一个md5对象
        m = hashlib.md5()
        #设置加密原始内容
        m.update(password.encode('utf-8'))
        #  返回加密后的字符串
        return m.hexdigest()

	#  校验使用md5加密的密码
    @staticmethod
    def  check_password(pwd,pwd_hash):
        m = hashlib.md5()
        m.update(pwd.encode('utf-8'))
        return m.hexdigest == pwd_hash

if __name__ == "__main__":
    print(Help.generate_password('123456'))