基于python网络编程实现支持购物、转账、存取钱、定时计算利息的信用卡系统

一、要求

二、思路

1.购物类buy

接收 信用卡类 的信用卡可用可用余额，

返回消费金额

2.信用卡（ATM）类

接收上次操作后，信用卡可用余额，总欠款，剩余欠款，存款

其中：　1.每种交易类型不单独处理金钱，也不单独记录流水账，每种交易类型调用处理金钱的函数（传入交易类型，交易金额）
　　　　2.处理金钱的函数，调用配置文件中关于每种交易类型的加减钱和利率

返回本次操作后信用卡可用余额，总欠款，剩余欠款，存款

3.客户端

银行管理员注册登陆
普通用户注册登陆
发送需求：注册、登陆、交易类型、交易金额

4.服务器端

调用购物类，创建购物对象(购物接口)
调用信用卡（ATM）类，处理还款，转账等操作，对利息按月记录，写入文件

5.定时任务

定时执行程序，以计算利息。

三、代码

3.1配置文件

import os

BASE_DIR = os.path.dirname(os.path.dirname(__file__))  #配置文件的上层目录
DB_DIR=os.path.join(BASE_DIR,'db')        #数据文件夹
ADMIN=os.path.join(DB_DIR,'admin')
ALL_USERS=os.path.join(DB_DIR,'allusrs')
A=os.path.join(BASE_DIR,'db','s')
LOG=os.path.join(BASE_DIR,'log')

TRANSACTION={
    'repay':{'action':'plus','interest':0}, #还款
    'withdraw':{'action':'minus','interest':0.05},#取现
    'transfer':{'action':'minus','interest':0.05},#转账
    'consume':{'action':'minus','interest':0},#消费
    'saving':{'action':'plus','interest':0}  #存款
}

3.2公共类

3.2.1购物类

class buy:
    goods=[
            {"name": "电脑", "price": 1999},
            {"name": "鼠标", "price": 10},
            {"name": "游艇", "price": 20},
            {"name": "美女", "price": 998},
        ]

    def __init__(self,money,consumption,shopping_cart,):
        self.money=money
        self.consumption=consumption
        self.shopping_cart=shopping_cart

    def  gouwu(self): #购物模块
        print('您的当前余额为：%d' %self.money)
        num=int(input('请输入商品序号：'))
        num-=1
        if self.goods[num]["name"] in self.shopping_cart.keys():               #goods[num]["name"]取商品名
            self.shopping_cart[self.goods[num]["name"]]['n']+=1                 #商品数量+1
        else:
            self.shopping_cart[self.goods[num]["name"]]={"price":self.goods[num]["price"],'n':1,}  # 创建购物车字典   {keys{"price"：价格,数量：1}}
        self.money-=self.shopping_cart[self.goods[num]["name"]]["price"]*self.shopping_cart[self.goods[num]["name"]]['n']       #单价*数量
        self.consumption+=self.shopping_cart[self.goods[num]["name"]]["price"]*self.shopping_cart[self.goods[num]["name"]]['n']

    def yichu(self):  #移除购物车模块
        c=int(input(' 请输入0/1选择是否移除购物车商品, 移除请输入1:'))
        if c==1:
            e=int(input(' 请输入要移除的商品序号:'))
            d=self.goods[e-1]
            if d in self.shopping_cart.keys():              #判断要移除的商品是否在购物车内
                self.shopping_cart.remove(d)          #移除商品
                self.money=self.money+self.goods[self.goods.index(d)]["price"]             #余额增加
                self.consumption=self.consumption-self.goods[self.goods.index(d)]["price"]  #消费总额减少
            else:
                print('商品不存在')
    def chongzhi(self):  #充值模块
        pay=int(input('请输入充值金额'))
        self.money=self.money+pay
        print('您的当前余额为：%d' % self.money)    #显示当前余额

    def main(self):
        print('商品清单：')
        for m,n in enumerate(self.goods,1):
            print(m)
            for v in n.values():
                print(v)
            print('=============')
        #消费总额清零
        self.consumption=0
        buy=True  #定义默认一直购物
        while buy:
            price=0  #定义初始价格
            b=1  #定义默认不退出购物或充值状态
            if self.money>=price:

        #消费模块；金钱大于货物价格时，才能开始购物
                while self.money>=price:
        #计价模块，有钱就可以一直购物
                    self.gouwu()
        #移除购物车商品模块
                    self.yichu()
                    if self.money>=0:
                        print('您的当前余额为：%d' %self.money)          #显示当前余额
                        b=int(input(' 请输入0/1选择是否继续购物, 购物请输入1:'))
                        if b==0:        #
                            break   #退出计价模块
                if b==0:           #如果不购物
                    break          #不购物退出整个购物程序
        #充值模块
            else:
                while self.money<price:          #金钱不足，可多次充钱，直到能买得起货物
                    a=int(input(' 您的余额不足，请输入0/1选择是否充值，充值请输入1:'))
                    if a==1:
                        self.chongzhi()
                    else:
                        break           #退出充值模块
                    if a==0:
                        break           #不充值退出程序
        #打印购物车商品名、商品价格、消费总额、余额
        print('您的消费清单为：')
        for m,n in self.shopping_cart.items():
            print(m,n['price'],n['n'])
                    #打印消费清单
            print('=============')
        print('您的当前余额为：%d,您的消费总额为：%d' % (self.money,self.consumption) )            #打印消费总额
        return self.consumption

3.2.2 信用卡ATM类

class Atm:
    credit=15000  #信用卡额度
    def __init__(self,balance,debt,remaining_debt,interest,saving,id):
        self.id=id             #信用卡id
        self.balance=balance     #信用卡可用金额
        self.debt=debt           #总欠款
        self.remaining_debt=remaining_debt #剩余欠款
        self.interest=interest      #手续费
        self.saving=saving     #存款
        self.now_time=time.strftime("%Y-%m-%d %H:%M:%S")
        self.now_data=time.strftime("%Y-%m")
        self.struct_time=time.gmtime(time.time())
        if self.struct_time.tm_mday>22:
            self.now_data=self.struct_time.tm_year+'-'+str(int(self.struct_time.tm_mon)+1)

    def account_info(self):#打印账户信息
       return '账户id%s 信用卡额度%s;信用卡可用金额%s;剩余欠款%s;'%(self.id,self.credit,self.balance,self.remaining_debt,)
    def ret_account_info(self):
        return [self.id,self.credit,self.balance,self.debt,self.remaining_debt,self.interest]
    def repay(self,amount):#还款
        self.handel_money('repay',amount)
    def withdraw(self,amount): #取现
        self.handel_money('withdraw',amount)
    def transfer(self,amount): #转账
        self.handel_money('transfer',amount)
    def consume(self,amount):  #消费
        self.handel_money('consume',amount)
    def saves(self,amount):
        self.handel_money('saving',amount)
    def transaction(self,a,amount):
        dic={
            '1':self.repay,
            '2':self.withdraw,
            '3':self.transfer,
            '4':self.consume,
            '5':self.saves
        }
        print("debug: a:",type(a),"amount:",type(amount))

        print(a)
        print(dic[a])
        print(dic["5"])
        dic[a](amount)
        print("end debug")

    def handel_money(self,transaction,amount): #交易类型，
        amount=int(amount)
        interest=amount*settings.TRANSACTION[transaction]['interest'] #手续费计算
        if settings.TRANSACTION[transaction]['action']=='plus':

            if amount<=self.remaining_debt:
                self.remaining_debt-=amount
                self.balance+=amount
            else:
                self.balance+=self.remaining_debt
                self.remaining_debt=0
                self.saving+=amount-self.remaining_debt
        else:

            if self.saving<amount:
                self.saving=0
                a=amount-self.saving
                self.balance-=a+interest-self.saving
                # self.debt+=amount+interest
                self.remaining_debt+=a+interest
        a='time:%s id:%s transaction: %s amount:%s interest %s \n'%(self.now_time,self.id,transaction,amount,interest)
        print(a)
        mulu=os.path.join(settings.ALL_USERS,self.id)
        path_name_liushui=os.path.join(mulu,str(self.id)+'name_liushui',str(self.now_data))

        with open(path_name_liushui,'a')as f:          #记录流水信息
            f.write(a)

        s=[self.balance,self.debt,self.remaining_debt,self.interest,self.saving,]     #更新基本信息
        path_name_base=os.path.join(mulu,str(self.id)+'name_base')
        pickle.dump(s,open(path_name_base,'wb'))

　3.3服务器端：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys,os
import hashlib
import pickle
import time
import socketserver
sys.path.append(os.path.dirname(os.path.dirname(__file__)))
from config import settings
from lib import modules
from lib.modules import *

class Myserver(socketserver.BaseRequestHandler):

    def md5(self,pwd):
        '''
        对密码进行加密
        :param pwd: 密码
        :return:
        '''
        hash=hashlib.md5(bytes('xx7',encoding='utf-8'))
        hash.update(bytes(pwd,encoding='utf-8'))
        return hash.hexdigest()

    def login(self,usrname,pwd,x):
        '''
        登陆
        :param usrname: 用户名
        :param pwd: 密码
        :return:是否登陆成功
        '''
        conn=self.request
        if x=='1':
            path_name_pwd=os.path.join(settings.ADMIN,usrname)
        else:
            mulu=os.path.join(settings.ALL_USERS,usrname)
            path_name_pwd=os.path.join(mulu,usrname+'name_pwd')
        s=pickle.load(open(path_name_pwd,'rb'))
        if usrname in s:
             if s[usrname]==self.md5(pwd):        #和加密后的密码进行比较
                return True
             else:
                return False
        else:
            return False

    def regist(self,usrname,pwd,x):
        '''
        注册
        :param usrname: 用户名
        :param pwd: 密码
        :return:是否注册成功
        '''

        conn=self.request
        if x=='1':
            mulu=os.path.join(settings.ADMIN,usrname)
        else:
            mulu=os.path.join(settings.ALL_USERS,usrname)

        if os.path.exists(mulu):
             return False
        else:
            os.mkdir(mulu)
            s={}
            s[usrname]=self.md5(pwd)
            path_name_pwd=os.path.join(mulu,usrname+'name_pwd')
            pickle.dump(s,open(path_name_pwd,'wb'))
            path_name_base=os.path.join(mulu,usrname+'name_base')
            pickle.dump([15000,{},0,0,0],open(path_name_base,'wb'))
            path_name_liushui=os.path.join(mulu,usrname+'name_liushui')
            os.mkdir(path_name_liushui)
            return True

    def user_identity_authentication(self,usrname,pwd,ret,x):
        '''
        判断注册和登陆，并展示用户的详细目录信息，支持cd和ls命令
        :return:
        '''
        conn=self.request
        if ret=='1':
            r=self.login(usrname,pwd,x)
            if r:
                conn.sendall(bytes('y',encoding='utf-8'))
            else:
                conn.sendall(bytes('n',encoding='utf-8'))
        elif ret=='2':
            # print(usrname,pwd)
            if x=='1':
                r=self.regist(usrname,pwd,x)
            else:   #用户注册
                s=[0,1]
                pickle.dump(s,open(settings.A,'wb'))
                while True:
                    ret=pickle.load(open(settings.A,'rb'))
                    if ret[0]==0:
                        time.sleep(30)
                        continue
                    elif ret[0]==1 or ret[0]==2:
                        break  #默认值已更改，银行管理员已操作

                if ret[0]==1:  #如果管理员同意
                    r=self.regist(usrname,pwd,x)
                else:
                    r=0
                s=[0,0]
                pickle.dump(s,open(settings.A,'wb'))
            if r:
                conn.sendall(bytes('y',encoding='utf-8'))
            else:
                conn.sendall(bytes('n',encoding='utf-8'))
    def interactive(self,usrname):  #进行交互
        conn=self.request
        while True:
            c=conn.recv(1024)  #接收用户交互选项
            r=str(c,encoding='utf-8')
            mulu=os.path.join(settings.ALL_USERS,usrname)
            path_name_base=os.path.join(mulu,usrname+'name_base')
            s=pickle.load(open(path_name_base,'rb'))

            #打印账户信息
            obj=modules.Atm(s[0],s[1],s[2],s[3],s[4],usrname)  #Atm对象
            a=obj.account_info() #接收账户信息
            conn.sendall(bytes(a,encoding='utf-8'))

            b=obj.ret_account_info()

            if r== '4':
                buy_obj=modules.buy(b[2],0,{})
                amount=buy_obj.main()
            elif r=='q':
                break
            else:
                s=conn.recv(1024)
                amount=str(s,encoding='utf-8')

            obj.transaction(r,amount)

        pass

    def handle(self):
        conn=self.request
        x=conn.recv(1024)
        x=str(x,encoding='utf-8')
        conn.sendall(bytes('收到用户类别',encoding='utf-8'))
        while True:
            if x=='1' or x=='2':
                b=conn.recv(1024)
                ret=str(b,encoding='utf-8')
                conn.sendall(bytes('b ok',encoding='utf-8'))
                c=conn.recv(1024)
                r=str(c,encoding='utf-8')
                usrname,pwd=r.split(',')
                print(usrname,pwd)
                self.user_identity_authentication(usrname,pwd,ret,x) #登陆或注册验证
                if x=='2':#普通用户身份验证成功后
                    self.interactive(usrname)

                    pass

                break
            elif x=='q':
                break

if __name__=='__main__':
    sever=socketserver.ThreadingTCPServer(('127.0.0.1',9999),Myserver)
    sever.serve_forever()

3.4 用户端

#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
本程序作为用户或银行管理员的入口，其中c=1代表银行管理员，c=2代表普通用户
'''
import pickle
import sys
import time
import os
import socket
sys.path.append(os.path.dirname(os.path.dirname(__file__)))
from config import settings
from lib import *
from lib.modules import *

def login(usrname,pwd):
    '''
    登陆
    :param usrname:用户名
    :param pwd:密码
    :return:是否登陆成功
    '''
    obj.sendall(bytes(usrname+','+pwd,encoding='utf-8'))
    ret=obj.recv(1024)
    r=str(ret,encoding='utf-8')
    if r=='y':
        return 1
    else:
        return 0

def regist(usrname,pwd,x):
    '''
    注册
    :param usrname:用户名
    :param pwd:密码
    :return:是否注册成功
    '''
    obj.sendall(bytes(usrname+','+pwd,encoding='utf-8'))

    ret=obj.recv(1024)
    r=str(ret,encoding='utf-8')
    if r=='y':
        return 1
    else:
        return 0
def user_identity_authentication(usrname,pwd,x):
    '''
    选择登陆或注册，展示用户的详细目录信息，支持cd和ls命令
    :return:
    '''
    a=input('请选择1.登陆 2.注册')
    obj.sendall(bytes(a,encoding='utf-8'))
    obj.recv(1024)
    if a=='1':
        ret=login(usrname,pwd)
        if ret:
            print('登陆成功')
            return 1
        else:
            print('用户名或密码错误')
            return 0
    elif a=='2':
        ret=regist(usrname,pwd,x)
        if ret:
            print('注册成功')
            return 1
        else:
            print('用户名已存在或银行管理员拒绝')
            return 0
def main(x):
    usrname=input('请输入用户名')
    pwd=input('请输入密码')
    if user_identity_authentication(usrname,pwd,x): #如果验证身份成功
        if x=='1':   #处理用户注册信息

            while True:
                s=pickle.load(open(settings.A,'rb'))
                if s[1]==0:
                    time.sleep(30)
                    continue
                elif s[1]==1:
                    while True:
                        a=input('用户请求注册，输入1同意，2拒绝')
                        if a=='1':
                            s=[1,0]
                            pickle.dump(s,open(settings.A,'wb'))
                            break
                        elif a=='2':
                            s=[2,0]
                            pickle.dump(s,open(settings.A,'wb'))
                            break
                        else:
                            print('输入有误')
                    break
        else:  #普通用户登陆后
            interactive()  #进行交互

def interactive():
    while True:
        a=input('请选择 1.还款 2.取现 3.转账 4.消费 5.存钱  q退出')
        obj.sendall(bytes(a,encoding='utf-8'))
        r=obj.recv(1024) #接收账户信息
        ret=str(r,encoding='utf-8')
        print(ret)
        if a !='4'and a !='q':
            b=input('请输入金额')
            obj.sendall(bytes(b,encoding='utf-8'))
        elif a=='q':
            break

obj=socket.socket() #创建客户端socket对象
obj.connect(('127.0.0.1',9999))
while True:
    x=input('请选择1.银行管理员 2.用户 q、退出')
    obj.sendall(bytes(x,encoding='utf-8'))
    obj.recv(1024)    #确认收到用户类别
    if x=='1' or x=='2':
        main(x)
        break
    elif x=='q':
        break
    else:
        print('输入有误请重新输入')

obj.close()

　3.5定时任务

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import os,sys
import json,pickle
import time
sys.path.append(os.path.dirname(os.path.dirname(__file__)))
from config import settings

def main():
    card_list = os.listdir(settings.ALL_USERS)
    for card in card_list:
        basic_info = pickle.load(open(os.path.join(settings.ALL_USERS, card, card+'name_base')))
        struct_time = time.localtime()

        # 循环账单列表，为每月的欠款计息。并写入到当月账单中
        for item in basic_info['debt']:
            interest = item['total_debt'] * 0.0005
            if basic_info[4] >= interest:
                basic_info[4] -= interest
            else:
                temp = interest - basic_info[4]
                basic_info[4]=0
                basic_info[0] -= temp
                pickle.dump(
                        basic_info,
                        open(os.path.join(settings.ALL_USERS, card, card+'name_base'),'w')
             )

        # 如果当前等于10号(9号之前)
        #   当前余额为负值，则将值添加到账单列表中，开始计息，同时，本月可用额度恢复。
        date = time.strftime("%Y-%m-%d")
        if struct_time.tm_mday == 11 and basic_info[2]>0:
            dic = {'date': date,
                   "total_debt":  basic_info[2],
                   "balance_debt": basic_info[2],
                   }
            basic_info[1].append(dic)
            # 恢复可用额度
            basic_info[0] = 15000
        pickle.dump(
            basic_info,
            open(os.path.join(settings.ALL_USERS, card, card+'name_base'),'w')
             )

def run():
    main()