学习python之路--Day4:ATM程序

需求

  • 额度 15000或自定义
  • 实现购物商城,买东西加入 购物车,调用信用卡接口结账
  • 可以提现,手续费5%
  • 支持多账户登录
  • 支持账户间转账
  • 记录每月日常消费流水
  • 提供还款接口
  • ATM记录操作日志
  • 提供管理接口,包括添加账户、用户额度,冻结账户等。。。
  • 用户认证用装饰器

需求分析

  1. 额度,初始化为15000,可以写入一个文件里balance.txt
  2. 购物车应用,可以参考购物车作业,整个购物车可以放到一个函数里,需要调用信用卡接口,就需要调用信用卡模块了,购物车脚本可以和信用卡的放在一起
  3. 提现,余额扣除提现金额*(1 + 0.05) 扣除金额不得大于余额的一半,提现完了之后扣除余额
  4. 多账户登陆,用户名密码写入一个文件里,参考登陆接口作业
  5. 账户之间转账,用户名对应的余额 - 转账金额,转账账户名对应的余额 + 转账金额
  6. 记录流水,还需要写一个流水文件,记录消费商品,金额,前面还需要加时间
  7. 还款接口,可以理解为向余额添加
  8. ATM操作记录
  9. 参考购物车作业里的manage.py
  10. 装饰器,我理解应该是不同的操作,给需要密码验证的,加上输入密码验证模块,就像真正的ATM那样,非重要的操作可以不需要密码

进一步思考:
balance和用户密码可以写成字典形式,用pickle导入到文件,到时候在load出来,方便处理,按用户名,密码,余额的形式对应起来,写在一个文件里。

import pickle

info_dict={'root':{'userpasswd':'python','balance':10000},
        'test':{'userpasswd':'test','balance':10000}}

f=open('user.info','wb')
pickle.dump(info_dict,f)
f.close()

购物车程序写在shopplist.py里,功能有选择商品,加入购物车,确认付款,到支付接口,完成后返回信息。
支付接口写在credit.py ,支付函数payment(),支付需要调用修改余额函数write_balance() 记录账单记录函数consumer_logger()
提现接口也可以写在credit.py里,提现函数withdraw(),提现需要调用修改余额函数write_balance(),记录操作记录atm_logger()

账户间转账写在credit.py里,转账函数transfer(),转账需要提供转账账户名,转账金额,需要调用修改余额函数write_balance(),记录操作记录atm_logger()
还款接口也可以写在credit.py里,还款函数repay(),需要调用修改余额函数write_balance(),记录操作记录atm_logger()

结构:

我们先来确定程序的结构
-atm
--\bin
---atm.py
---shopping.py
---manager.py
--\core
---各类程序模块
--\logs
---atm.log
---cust.log

其中bin目录为执行入口目录,atm.py是ATM仿真程序的启动入口,shopping.py是购物车程序的启动入口,manager.py是管理账户程序的启动入口
core目录下主要放置各类程序模块
logs目录下主要放置操作流水记录日志,atm.log是ATM操作记录,cust.log是信用卡消费记录
setting目录下主要放置配置文件

流程图

我们先来确定atm的流程图


学习python之路--Day4:ATM程序_第1张图片
atm

然后是购物车的流程图


学习python之路--Day4:ATM程序_第2张图片
shopping

最后是manager的流程图


学习python之路--Day4:ATM程序_第3张图片
manager

实现


用户数据存放

考虑之前用字典存放用户账户名和密码,这次多了一个balance,那就字典里增加一个key叫'balance',字典形式这样的:
{'test': {'balance': 11000.0, 'passwd': 'test'}, 'root': {'balance': 9000.0, 'passwd': 'python'}}

用户名对应一个字典,内字典key是passwd和balance,对应用户的密码和余额,在实现程序之前,先创建这个user.info文件
我用pickle.dump方法把测试用户写入文件:

import pickle

info_dict={'root':{'passwd':'python','balance':10000},
    'test':{'passwd':'test','balance':10000}}

f=open('user.info','wb')
pickle.dump(info_dict,f)
f.close()

同样的,用pickle的方法,写一个product.txt的文件,用来存放商品信息,商品有名称和价格,参考之前的购物车项目,我们做成列表类型。
product.txt的脚本可以跟之前写user.info文件的脚本合并,做成一个初始化脚本:

import pickle

info_dict={'root':{'passwd':'python','balance':10000},
    'test':{'passwd':'test','balance':10000}}

f=open('user.info','wb')
pickle.dump(info_dict,f)
f.close()

pro_list=[['iphone', 6200], ['mac pro', 12000], ['bike', 800], ['book', 55], ['coffee', 31], ['windows pc', 4900]]
f=open('product.txt','wb')
pickle.dump(pro_list,f)
f.close()

初始化数据好了之后,已经拥有了一些测试账号和商品,开始做我们的登陆接口login

登陆接口

参考之前的作业,登录接口的主逻辑我们这样写:

f=open('user.info','rb')
    user_dict=pickle.load(f)
    f.close()
    
    while True:
        username=input('Enter your account:')
        password=input('Enter your password:')
        if username not in user_dict:
            print('Sorry,your account is not exist!\n')
            continue
       
        else:
            if user_dict[username]['passwd'] != password:
                print ('Sorry,your password invalid!\nPlease try again!\n')
                continue
            else:
                print ('Welcome {}!'.format(username))
                break

输入帐号密码,判断是否存在用户,之后判断密码是否是字典里用户名对应的二级字典'passwd'对应的value,稍后这个需要做成装饰器,我们先做成一个可调用的函数形式:

def login():
    f=open('user.info','rb')
    user_dict=pickle.load(f)
    f.close()
    
    
    while True:
        username=input('Enter your account:')
        password=input('Enter your password:')
        if username not in user_dict:
            print('Sorry,your account is not exist!\n')
            continue
       
        else:
            if user_dict[username]['passwd'] != password:
                print ('Sorry,your password invalid!\nPlease try again!\n')
                continue
            else:
                print ('Welcome {}!'.format(username))
                break
    return username

函数返回的值我们暂时定为输入的用户名。

还有一个冻结账户的需求,这里还需要有个blacklist.txt用来存放被冻结的账户,参考之前的作业,黑名单做成列表,存放用户名,pickle序列化到文件里。
在初始化脚本里加上创建blacklist.txt文件的代码:

import pickle

info_dict={'root':{'passwd':'python','balance':10000},
    'test':{'passwd':'test','balance':10000}}

blacklist=['blacklist']

f=open('user.info','wb')
pickle.dump(info_dict,f)
f.close()

pro_list=[['iphone', 6200], ['mac pro', 12000], ['bike', 800], ['book', 55], ['coffee', 31], ['windows pc', 4900]]

f=open('product.txt','wb')
pickle.dump(pro_list,f)
f.close()

f=open('blacklist.txt','wb')
pickle.dump(blacklist,f)
f.close()

创建好之后,完善登录接口的逻辑,我们把user.info文件写成变量info_path,取得值是本文件所在目录下的'user.info',黑名单文件同理也这么写:

#owner:houyizhong
#version:1.0

import pickle
import os

filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
info_path=dirname+os.sep+'user.info'
blackfile_path=dirname+os.sep+'blacklist.txt'

def login():
    f=open(info_path,'rb')
    user_dict=pickle.load(f)
    f.close()
    
    blackfile=open(blackfile_path,'rb')
    blacklist=pickle.load(blackfile)
    blackfile.close()

    while True:
        username=input('Enter your account:')
        password=input('Enter your password:')
        if username not in user_dict:
            print('Sorry,your account is not exist!\n')
            continue
        elif username in blacklist:
                    print ("Sorry you are in blacklist!")
                    continue
        else:
            if user_dict[username]['passwd'] != password:
                print ('Sorry,your password invalid!\nPlease try again!\n')
                continue
            else:
                print ('Welcome {}!'.format(username))
                break
    
    return username

新增逻辑对blacklist.txt的读取列表,登录接口里对用户输入的用户名的判断,是否在列表里。

信用卡

登录接口完成之后,我们再来一一实现信用卡功能的各个模块。

我把信用卡功能分为消费(即支付),查余额,查账单,转账,提现,还款等功能块。我们一个个来实现。

还记得我们的账户余额是写在用户信息的文件里,作为二级字典的value存在的吗?消费,转账,提现,还款都要对余额有个修改操作,我们可以统一做成一个写入余额的功能模块。
实现写入文件的模块balance_module

import pickle
import os

filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
info_path=dirname+os.sep+'user.info'

def write_balance(data):
    f=open(info_path,'wb')
    pickle.dump(data,f)
    f.close()

上面的代码,我是打开相对路径下的user.info文件,其实是跟balance_module是属于同一目录的,写成info_path可以方便日后迁移user.info路径。
函数write_balance接受的是一个字典,模块会把这个字典写入文件,覆盖之前的内容,这就要求我们传入的字典是带有所有用户信息的,一个已经调整好的字典,不会再有变动了。
这样写的好处是,所有信息修改完成之后,才会写入文件,这样下次读取的文件内容就是最新的了。这个道理我们在上一篇中已经探讨过。

读取user.info文件的函数
info_path的路径即为user.info的相对于credit.py的位置

filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
info_path=dirname+os.sep+'user.info'

def read_info():

    f=open(info_path,'rb')
    data=pickle.load(f)
    f.close()
    return data

返回的data是提取出来的字典。

一些基本动作

我们在写程序时,常常会遇到一些动作是频繁做的,比如扣除余额(消费,提现,转账都会用到),添加余额(还款,收到转账),还有判断余额是否充足,是否满足动作(消费,提现)所需的金额。这些可以复用的代码,我们就把它做成函数,需要时调用好了。

def add(username,bill,data):
    balance=data[username]['balance']
    balance += bill
    data[username]['balance']=balance
    return data

def subtract(username,bill,data):
    balance=data[username]['balance']
    balance -= bill
    data[username]['balance']=balance
    print ('Your balance is {}\n'.format(balance))
    return data

def judgment(username,bill):
    data=read_info()
    balance=data[username]['balance']
    if balance >= bill:
        return 'success'
    else:
        print ('Your balance is not enought!\n')
        return 'failure'

余额的删减都需要对整个字典进行修改(这样返回数据时,接受数据的模块处理更方便,直接把data写入文件),判断余额是否满足动作所需金额bill的函数,我们返回是'success'和'failure',这样调用函数的模块更容易判断是否满足,直接根据收到的字符来判断。

日志记录
我们要有日志记录功能,记录我们每一次的消费,要有消费时间,消费项目,金额,消费记录这个动作做成模块,其他模块可以复用:

def consumer_logger(username,stock,price):

    user_dir=log_path+os.sep+username

    if not os.path.exists(user_dir):
        os.mkdir(user_dir)

    cust_log=user_dir+os.sep+'cust.log'

    times=time.strftime('%Y%m%d%H%M%S')
    data='{0}\t{1}\t{2}'.format(times,stock,price)

    log=open(cust_log,'a')
    log.write('{}\n'.format(data))
    log.close()

我们的日志是放在logs目录下的,同时还要根据用户不同创建不同的日志信息,这样方便区分。
我们用user_dir代表logs下的用户文件夹,当不存在时,创建文件夹
cust_log代表用户文件夹下的cust.log文件,具体的信息盛放在里面。
接受的形参分别代表用户名,商品名(购物车列表),金额
调用time模块,用time.strftime()方法取到年月日小时分秒级别的时间,用制表符写入文件

同理,atm操作记录也这么写

def atm_logger(username,operating,money):
    user_dir=log_path+os.sep+username

    if not os.path.exists(user_dir):
        os.mkdir(user_dir)

    atm_log=user_dir+os.sep+'atm.log'

    times=time.strftime('%Y%m%d%H%M%S')
    data='{0}\t{1}\t{2}'.format(times,operating,money)

    log=open(atm_log,'a')
    log.write('{}\n'.format(data))
    log.close()

接受的形参分别为用户名,动作,金额。

支付模块

我们写一个支付函数payment来实现逻辑:

import balance_module

def payment(shoplist,bill):

    data=read_info()
    username=login()

    result=judgment(username,bill)

    if result == 'success':
        data=subtract(username,bill,data)
        balance_module.write_balance(data)
        consumer_logger(username,shoplist,bill)

    return result

可以看到我们需要调用用户认证接口,因为到付款界面了,必须知道银行账户。
调用了读取用户信息字典的read_info()函数,将字典提取出来
调用了judgment()来判断用户对应的余额是否满足
如果收到的是'success',调用扣除余额的函数,将字典写入文件的函数,消费日志记录函数

以上函数我们都已经写出来了。
然后函数返回的结果是成功或者失败。很容易理解对吧。

转账模块就是一个用户余额减少,另一个用户余额增加,可以这么写(为了直观,我没有把add() subtract() judgment() atm_logger()这些调用的函数写出来,下面几个也是如此):

import balance_module

def transfer():
    username=login()
    
    data=read_info()
    transfer_account=input('Enter transfer account:')
    transfer_money=input('Enter transfer money:')
    if transfer_account in data:
        if transfer_money.isdigit:
            transfer_money=float(transfer_money)
            result=judgment(username,transfer_money)
            if result == 'success':
                data=subtract(username,transfer_money,data)
                data=add(transfer_account,transfer_money,data)
                print ('Your transfer done!\n')
                balance_module.write_balance(data)
                atm_logger(username,'transfer',transfer_money)
            elif result == 'failure':
                print ('Your balance is not enought!\n')
            else:
                print ('Sorry,there have some unknown error!\n')
        else:
            print ('Sorry,your enter money is not a digit!\n')
    else:
        print('Sorry,your enter account is not exist!\n')

提现模块也很好写,用户余额减少,同时判断余额一半是否大于提现的金额:

import balance_module

def withdraw():
    username=login()
    data=read_info()
    withdraw_money=input('Enter your withdraw money:')
    if withdraw_money.isdigit():
        cost_money=float(withdraw_money)*(1+0.05)
        result=judgment(username,cost_money)
        withdraw_money=float(withdraw_money)
        if result == 'success':
            if withdraw_money > (data[username]['balance']/2):
                print ('Sorry,your withdraw money is more than avalid balance!\n')
            else:
                data=subtract(username,cost_money,data)
                balance_module.write_balance(data)
                atm_logger(username,'withdraw',cost_money)
                print ('Your withdraw done!\n')
    else:
        print('Sorry,you enter is not digit!\n')

也是调用了一堆现成的函数,把它们拼贴起来。

还款,就是新增余额:

import balance_module

def repay():
    username=login()
    data=read_info()
    repay_money=input('Enter your repay money:')
    if repay_money.isdigit():
        repay_money=float(repay_money)
        data=add(username,repay_money,data)
        balance_module.write_balance(data)
        atm_logger(username,'repay',repay_money)
        print('Your repay done!\n')
    else:
        print('Sorry,your enter is not digit!\n')

以上几个函数基本实现了一个信用卡的基本功能

完整的代码

#owner:houyizhong
#version:1.0

import pickle,time,os
import  balance_module
from demo_login import login

filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
info_path=dirname+os.sep+'user.info'
log_path=os.path.dirname(dirname)+os.sep+'logs'

def read_info():
    f=open(info_path,'rb')
    data=pickle.load(f)
    f.close()
    return data

def add(username,bill,data):
    balance=data[username]['balance']
    balance += bill
    data[username]['balance']=balance
    return data

def subtract(username,bill,data):
    balance=data[username]['balance']
    balance -= bill
    data[username]['balance']=balance
    print ('Your balance is {}\n'.format(balance))
    return data

def judgment(username,bill):
    data=read_info()
    balance=data[username]['balance']
    if balance >= bill:
        return 'success'
    else:
        print ('Your balance is not enought!\n')
        return 'failure'

def atm_logger(username,operating,money):
    user_dir=log_path+os.sep+username
    if not os.path.exists(user_dir):
        os.mkdir(user_dir)
    atm_log=user_dir+os.sep+'atm.log'
    times=time.strftime('%Y%m%d%H%M%S')
    data='{0}\t{1}\t{2}'.format(times,operating,money)
    log=open(atm_log,'a')
    log.write('{}\n'.format(data))
    log.close()

def consumer_logger(username,stock,price):
    user_dir=log_path+os.sep+username
    if not os.path.exists(user_dir):
        os.mkdir(user_dir)
    cust_log=user_dir+os.sep+'cust.log'
    times=time.strftime('%Y%m%d%H%M%S')
    data='{0}\t{1}\t{2}'.format(times,stock,price)
    log=open(cust_log,'a')
    log.write('{}\n'.format(data))
    log.close()

def inquire():
    
    data=read_info()
    username=login()
    
    print('Your balance is :')
    print(data[username]['balance'])

def payment(shoplist,bill):
    data=read_info()
    username=login()
    result=judgment(username,bill)
    if result == 'success':
        data=subtract(username,bill,data)
        balance_module.write_balance(data)
        consumer_logger(username,shoplist,bill)
    return result

def transfer():
    username=login()
    
    data=read_info()
    transfer_account=input('Enter transfer account:')
    transfer_money=input('Enter transfer money:')
    if transfer_account in data:
        if transfer_money.isdigit:
            transfer_money=float(transfer_money)
            result=judgment(username,transfer_money)
            if result == 'success':
                data=subtract(username,transfer_money,data)
                data=add(transfer_account,transfer_money,data)
                print ('Your transfer done!\n')
                balance_module.write_balance(data)
                atm_logger(username,'transfer',transfer_money)
            elif result == 'failure':
                print ('Your balance is not enought!\n')
            else:
                print ('Sorry,there have some unknown error!\n')
        else:
            print ('Sorry,your enter money is not a digit!\n')
    else:
        print('Sorry,your enter account is not exist!\n')

def withdraw():
    username=login()
    data=read_info()
    withdraw_money=input('Enter your withdraw money:')
    if withdraw_money.isdigit():
        cost_money=float(withdraw_money)*(1+0.05)
        result=judgment(username,cost_money)
        withdraw_money=float(withdraw_money)
        if result == 'success':
            if withdraw_money > (data[username]['balance']/2):
                print ('Sorry,your withdraw money is more than avalid balance!\n')
            else:
                data=subtract(username,cost_money,data)
                balance_module.write_balance(data)
                atm_logger(username,'withdraw',cost_money)
                print ('Your withdraw done!\n')
    else:
        print('Sorry,you enter is not digit!\n')

def repay():
    username=login()
    data=read_info()
    repay_money=input('Enter your repay money:')
    if repay_money.isdigit():
        repay_money=float(repay_money)
        data=add(username,repay_money,data)
        balance_module.write_balance(data)
        atm_logger(username,'repay',repay_money)
        print('Your repay done!\n')
    else:
        print('Sorry,your enter is not digit!\n')

单独测试每个模块也是没问题的。这样 我们就可以继续写下去了。

购物车程序

这里可以参考之前的作业,再加上一个调用信用卡模块

import pickle,os
import demo_credit
filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
product_path=dirname+os.sep+'product.txt'
def shopping():
    
    shopping_list=[]
    price=0
    
    '''read product'''
    f=open(product_path,'rb')
    product_list=pickle.load(f)
    f.close()
    def credit_payment(shoplist,price):
            result=demo_credit.payment(shoplist,price)
            
            if result == 'success':
                print ('You shopping done!')
            elif result == 'failure':
                print ('Sorry,your credit card balance is not enought!\n')
            else:
                print('Sorry,there have some unknown error!\n')

    while True:
        for index,item in enumerate(product_list):
            print(index+1,item)
        user_choice=input("Choice a product code('q' is exit.'pay' is settlement):")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if  user_choice <= len(product_list) and user_choice > 0:
                user_choice -= 1
                price += int(product_list[user_choice][1])
                shopping_list.append(product_list[user_choice][0])
                print ('Add {} to your shopplist!\n'.format(product_list[user_choice][0]))
            else:
                print("Sorry,product code isn's exist!\n")
        elif user_choice == "q":
            break
        elif user_choice == 'pay':
            print('Your check is {}'.format(price))
            if price != 0:
                credit_payment(shopping_list,price)
            break
        else:
            print("Your enter invalid!\n")

我们先进入while循环,打印商品列表,让用户输入选择,加入购物车列表,q是退出,pay是支付,当金额是0时不需要调用信用卡模块。
支付大于0时调用信用卡模块,进入支付接口,从支付接口那里收到'success'或者'failure'的判断,做成相应动作。

然后是管理模块
也是参考之前的作业,调用现成的函数,就完成了

import pickle,os
import balance_module
filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
info_path=dirname+os.sep+'user.info'
blackfile_path=dirname+os.sep+'blacklist.txt'
def read_info():
    f=open(info_path,'rb')
    data=pickle.load(f)
    f.close()
    return data
def add_account():
    data=read_info()
    count_name=input('Enter add account("b" is back):')
    if count_name == 'b':
        pass
    else:
        count_balance=input('Enter account balance("b" is back):')
        if count_balance.isdigit():
            count_balance=int(count_balance)
            count_passwd=input('Enter account password("b" is back):')
            if count_passwd == 'b':
                pass
            else:
                data[count_name]={'passwd':count_passwd,'balance':count_balance}
                balance_module.write_balance(data)
                print('Done')
        elif count_balance == 'b':
            pass
        else:
            print('Sorry,your enter balance is not digit!\n')
def change_account():
    data=read_info()
    change_name=input('Enter change account name:')
    if change_name in data:
        change_balance=input('Enter change account balance:')
        if change_balance.isdigit():
            change_balance=int(change_balance)
            data[change_name]['balance']=change_balance
            balance_module.write_balance(data)
            print ('Done')
        elif change_balance == 'b':
            pass
        else:
            print('Sorry,your enter is not digit!\n')
    elif change_name == 'b':
        pass
    else:
        print ('Sorry,your choose account is not exist!\n')
    
def blacklist():
    f=open(blackfile_path,'rb')
    list=pickle.load(f)
    f.close()
    data=read_info()
    blacklist_name=input('Enter blacklist account name:')
    if blacklist_name in data:
        list.append(blacklist_name)
        f=open(blackfile_path,'wb')
        pickle.dump(list)
        f.close()
    elif blacklist_name == 'b':
        pass
    else:
        print ('Sorry,you choose account is not exist!\n')

完成这些之后,我们来到bin目录下实现启动接口

购物车接口

这边只是需要调用购物车模块,只是需要注意现在购物车程序跟核心模块不在一个目录里,注意调用模块时的路径

import os,sys
BASE_DIR=os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
CORE_DIR=BASE_DIR+os.sep+'core'
sys.path.append(BASE_DIR)
sys.path.append(CORE_DIR)
import core
core.demo_shoplist.shopping()

把core目录放进系统变量,调用下面的模块文件

管理程序

import os,sys
BASE_DIR=os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
CORE_DIR=BASE_DIR+os.sep+'core'
sys.path.append(BASE_DIR)
sys.path.append(CORE_DIR)
from core import demo_manage
action_list=['Add account','Edit account','Block account']
while True:
    for index,item in enumerate(action_list):
        print(index+1,item)
    print('"q" is exit.')
    enter_action=input('Enter your choice:')
    if enter_action.isdigit():
        if enter_action == '1':
            demo_manage.add_account()
            continue
        elif enter_action == '2':
            demo_manage.change_account()
            continue
        elif enter_action == '3':
            demo_manage.blacklist()
            continue
    else:
        if enter_action == 'q':
            exit()
        else:
            print('Sorry,your enter invaild!\n')

也是要把core目录放进系统变量里。

atm启动接口

import os
import sys
BASE_DIR=os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
CORE_DIR=BASE_DIR+os.sep+'core'
sys.path.append(BASE_DIR)
sys.path.append(CORE_DIR)
from core import demo_credit

action_list=['Query check','Transfer','Query balance','Withdraw','Repay']
while True:
    for index,item in enumerate(action_list):
        print(index+1,item)
    print('"q" is exit.')
    enter_action=input('Enter your choice:')
    if enter_action.isdigit():
        if enter_action == '1':
            '''Query check'''
            continue
        elif enter_action == '2':
            '''Transfer'''
            demo_credit.transfer()
            continue
        elif enter_action == '3':
            '''Query balance'''
            demo_credit.inquire()
            continue
        elif enter_action == '4':
            '''Withdraw'''
            demo_credit.withdraw()
            continue
        elif enter_action == '5':
            '''Repay'''
            demo_credit.repay()
            continue
        else:
            print ('Sorry,you enter invaild!\n')
            continue
    else:
        if enter_action == 'q':
            exit()
        else:
            print('Sorry,your enter invaild!\n')

主要是打印可操作项,对输入做判断,调用响应的模块,也是需要注意模块调用时的添加系统变量。

用户认证用装饰器

装饰器的样式这样:

def login(func):
    def decorator(*args,**kwargs):
        
        func(*args,**kwargs)
        
    return decorator

@login
def func():
    pass

func()

我们对login()函数进行改造

import pickle
import os
filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
info_path=dirname+os.sep+'user.info'
blackfile_path=dirname+os.sep+'blacklist.txt'
def login(func):
    def decorator(*args,**kwargs):
        f=open(info_path,'rb')
        user_dict=pickle.load(f)
        f.close()
        
        blackfile=open(blackfile_path,'rb')
        blacklist=pickle.load(blackfile)
        blackfile.close()
        while True:
            username=input('Enter your account:')
            password=input('Enter your password:')
            if username not in user_dict:
                print('Sorry,your account is not exist!\n')
                continue
            elif username in blacklist:
                print ("Sorry you are in blacklist!")
                continue
            else:
                if user_dict[username]['passwd'] != password:
                    print ('Sorry,your password invalid!\nPlease try again!\n')
                    continue
                else:
                    print ('Welcome {}!'.format(username))
                    break
        func(username,*agrs,**kwargs)
        
    return decorator

@login
def func(username):
    print(username)
func()

这样测试,可以正常实现功能,现在要融入其他模块中。
在同级目录下写一个测试文件

from demo_login import login
@login
def func(username):
    print(username)
func()

测试,可以实现,于是移植到其他模块里。

import pickle,time,os
import  balance_module
from demo_login import login

filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
info_path=dirname+os.sep+'user.info'
log_path=os.path.dirname(dirname)+os.sep+'logs'

@login
def query(username):
    user_dir=log_path+os.sep+username
    if not os.path.exists(user_dir):
        print('Sorry,you do not have check.')
    else:
        cust_log=user_dir+os.sep+'cust.log'
        if os.path.exists(cust_log):
            log=open(cust_log,'r')
            print('You check is:')
            print(log.read())
            log.close()
        else:
            print('Sorry,you do not have check.')
    
@login
def inquire(username):
    
    data=read_info()
    
    print('Your balance is :')
    print(data[username]['balance'])

@login
def payment(username,shoplist,bill):
    data=read_info()
    result=judgment(username,bill)
    if result == 'success':
        data=subtract(username,bill,data)
        balance_module.write_balance(data)
        consumer_logger(username,shoplist,bill)
    return result

@login
def transfer(username):
    data=read_info()
    transfer_account=input('Enter transfer account:')
    transfer_money=input('Enter transfer money:')
    if transfer_account in data:
        if transfer_money.isdigit:
            transfer_money=float(transfer_money)
            result=judgment(username,transfer_money)
            if result == 'success':
                data=subtract(username,transfer_money,data)
                data=add(transfer_account,transfer_money,data)
                print ('Your transfer done!\n')
                balance_module.write_balance(data)
                atm_logger(username,'transfer',transfer_money)
            elif result == 'failure':
                print ('Your balance is not enought!\n')
            else:
                print ('Sorry,there have some unknown error!\n')
        else:
            print ('Sorry,your enter money is not a digit!\n')
    else:
        print('Sorry,your enter account is not exist!\n')

@login
def withdraw(username):
    data=read_info()
    withdraw_money=input('Enter your withdraw money:')
    if withdraw_money.isdigit():
        cost_money=float(withdraw_money)*(1+0.05)
        result=judgment(username,cost_money)
        withdraw_money=float(withdraw_money)
        if result == 'success':
            if withdraw_money > (data[username]['balance']/2):
                print ('Sorry,your withdraw money is more than avalid balance!\n')
            else:
                data=subtract(username,cost_money,data)
                balance_module.write_balance(data)
                atm_logger(username,'withdraw',cost_money)
                print ('Your withdraw done!\n')
    else:
        print('Soory,you enter is not digit!\n')

@login
def repay(username):
    data=read_info()
    repay_money=input('Enter your repay money:')
    if repay_money.isdigit():
        repay_money=float(repay_money)
        data=add(username,repay_money,data)
        balance_module.write_balance(data)
        atm_logger(username,'repay',repay_money)
        print('Your repay done!\n')
    else:
        print('Sorry,your enter is not digit!\n')

测试可以实现功能

注意不止credit.py需要用到认证,其他文件可能也需要,像是shoplist.py。代码如下:

import pickle,os
from demo_login import login
import demo_credit

filename=os.path.abspath(__file__)
dirname=os.path.dirname(filename)
product_path=dirname+os.sep+'product.txt'

def shopping():
    
    shopping_list=[]
    price=0
    
    '''read product'''
    f=open(product_path,'rb')
    product_list=pickle.load(f)
    f.close()

    @login
    def credit_payment(username,shoplist,price):
            result=demo_credit.payment(username,shoplist,price)
            
            if result == 'success':
                print ('You shopping done!')
            elif result == 'failure':
                print ('Sorry,your credit card balance is not enought!\n')
            else:
                print('Sorry,there have some unknown error!\n')

    while True:
        for index,item in enumerate(product_list):
            print(index+1,item)
        user_choice=input("Choice a product code('q' is exit.'pay' is settlement):")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if  user_choice <= len(product_list) and user_choice > 0:
                user_choice -= 1
                price += int(product_list[user_choice][1])
                shopping_list.append(product_list[user_choice][0])
                print ('Add {} to your shopplist!\n'.format(product_list[user_choice][0]))
            else:
                print("Sorry,product code isn's exist!\n")
        elif user_choice == "q":
            break
        elif user_choice == 'pay':
            print('Your check is {}'.format(price))
            if price != 0:
                credit_payment(shopping_list,price)
            break
        else:
            print("Your enter invalid!\n")

这里用了之后,credit.py里的paymant()函数就可以去掉装饰器了。

坑:

  • 所有用的文件都需要写成变量形式啊,因为启动入口目录下面没有啊,而且不能写死,必须用os.path.dirname方式加os.sep加文件名拼贴才行啊!!
  • credit里的consumer_logger()函数需要按不同账户创建不同的log啊啊啊!
  • 自己写的模块A import了另一个自己写的模块B,启动程序那里还需要加上模块B所在路径的系统搜索路径啊~不然from package import 模块A的时候,模块A再import 模块B,这个时候不知道从哪里找模块B,因为启动程序的系统路径里找不到模块B;如果是import package,运行__init__.py的时候,from . import 模块B,这个时候启动程序的系统搜索路径里也找不到B。

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