用python实现简易图书管理系统

目录

• 用python实现简易图书管理系统
• • 前言
  • 程序架构
  • 前期准备
  • • txt文件
    • 代码准备
  • 代码实现
  • • 登陆系统
    • 主程序
    • 借书
    • 还书
    • 显示全部书籍
    • 添加图书
  • 全部代码

前言

很多图书馆都有自己的图书管理系统，它主要担负的功能有借书和还书，以及图书管理员对图书的操作等。

程序架构

用户登录/注册—>借书/还书/查看图书---->（管理员）添加、修改图书信息

前期准备

txt文件

首先，在任意位置创建一个文件夹，创建以下几个txt文件：

bookISDN,ISDN.txt:存储书籍的ISDN编号
can lend,lended.txt:存储书籍名称
number,usrinfo.txt:存储用户名，密码
point.txt:存储每个账号还能借出的图书本书
per.txt:存储权限文件

代码准备

因为这个程序会涉及到大量的文件读取，所以我们可以用def函数来简化过程：

def open_wf(name,write):#写入txt（覆盖）   str(write)   with open(name,"w",encoding="utf-8") as f:     f.write(write)     f.close()   return True def open_wj(name,write):#写入txt（不覆盖）   str(write)   with open(name,"a",encoding="utf-8") as f:     f.write(write)     f.close()   return True def open_r(name):#读取（仅第一行）     with open (name,"r",encoding="utf-8") as f:         data = f.readline()         f.close()     return data def open_r1(name):#全部读取     with open (name,"r",encoding="utf-8") as f:         data = f.readlines()         f.close()     return data  def now():     times=time.localtime()     	now=str(times.tm_hour)+":"+str(times.tm_min)+":"+str(time.tm_sec)     return now def msgbox(flag,word):     if flag=="1":         print(word)     elif flag=="2":         print(word)  

代码实现

登陆系统

代码：

def login():     usrall=open_r1("usrinfo.txt")     number=open_r1("number.txt")     #去掉\n     for a in range(0,len(usrall)):         usrall[a]=usrall[a].rstrip("\n")     name=[]     for b in range(0,len(number)):         number[b]=number[b].rstrip("\n")     name=[]     seenum=0          print('''欢迎来到登录系统 提示：注册系统暂时关闭 *please choose:* **************** *****1.登录***** *****2.EMPTY**** ****************''')     cho_0=input("*********choose:")     go="0"     if cho_0=="1":         name_i=input("用户名：")         number_i=input("密码：")         if len(usrall)==len(number):           for c in range(0,len(usrall)):             if usrall[c]==name_i and number[c]==number_i:               word=name_i+",登陆成功"               msgbox("2",word)               permission="none"               open_wf("per.txt",permission)               seenum=c                              main()             elif "admin"==name_i and "admin123"==number_i:               msgbox("2","管理员登陆成功")               w=input("警告：管理员禁止操作借、还书系统！！！")               time.sleep(1)               permission="true"               open_wf("per.txt",permission)               print(permission)               seenum=c               main()             elif c==len(usrall)-1:               msgbox("1","用户名或密码错误")               login()         else:           msgbox("1"," ): 程序遇到未知错误,请检查配置")     elif cho_0=="2":       print("注册系统已关闭")       login()       while (1==2):         start="1"         newname=input("请输入用户名：")         newnum=input("请输入密码：")         for d in range(0,len(usrall)):           if newname==usrall[d]:             msgobx("2","用户名已存在")             break           else:             start="0"         if start=="0":           newname=newname+"\r"           newnum=newnum+"\r"           open_wj("usrinfo.txt",newname)           open_wj("number.txt",newnum)           word="5"+"\r"           open_wj("point.txt",word)           word="\r"           open_wj("seeword.txt",word)           msgbox("2","新用户创建成功，请重启系统登录")         else:           s=0  

主程序

代码：

def main():   print('''欢迎来到图书管理系统 *******please choose:********* ****************************** **********0.显示全部********** ***1.借书********2.还书******* ***3.添加图书****4.删除图书*** ***5.修改图书****6.修改信息*** ***7.退出登录****8.退出******* ******************************''')   s=input("choose:")   if s=="1":     lend_book()   elif s=="0":     view_all()   elif s=="2":     return_book()   elif s=="3":     add_book()   elif s=="7":     back_to_login()   elif s=="8":     exit()  

借书

def lend_book():   canlendbook=open_r1("can lend.txt")   bookISDN=open_r1("bookISDN.txt")   points=open_r1("point.txt")   for b in range(0,len(canlendbook)):     canlendbook[b]=canlendbook[b].rstrip("\n")     bookISDN[b]=bookISDN[b].rstrip("\n")   for c in range(0,len(points)):     points[c]=points[c].rstrip("\n")      print('''请选择: **************** ***1.查找书名*** ***2.查找书号*** ****************''')   s=input("choose:")   if s=="1":     bookname=input("请输入书名：")     for b in range(0,len(canlendbook)):       if canlendbook[b]==bookname:         print("成功查找到书籍:",bookname)         print("*********************************")         print("请确认信息，无误请按Y")         print()         print("书籍名称：",canlendbook[b])         print("书籍ISDN号：",bookISDN[b])         s=input("请确认(Y/N)")         if s=="Y":           end_1=bookISDN[b]+"\r"           end_2=canlendbook[b]+"\r"           open_wj("ISDN.txt",end_1)           open_wj("lended.txt",end_2)           canlendbook.pop(b)           bookISDN.pop(b)           word_1=canlendbook[0]+"\r"           word_2=bookISDN[0]+"\r"           open_wf("can lend.txt",word_1)           open_wf("bookISDN.txt",word_2)           for b in range(0,len(bookISDN)-1):             word1=canlendbook[b+1]+"\r"             word2=bookISDN[b+1]+"\r"             open_wj("can lend.txt",word1)             open_wj("bookISDN.txt",word2)           if int(points[seenum])>0:             points[seenum]=str(int(points[seenum])-1)             word=points[0]+"\r"             open_wf("point.txt",word)             for t in range(0,len(points)):               word=points[t-1]+"\r"               open_wj("point.txt",word)             print("处理成功，您可再借出",points[seenum],"本书")             main()             break           else:             print("您借的书已达到5本，请先还书")             main()             break         else:           main()       elif b==len(canlendbook)-1:         word="找不到书籍'"+bookname+"',请检查拼写或此书已借出"         msgbox("1",word)         main()         break   elif s=="2":     '''namenum=0'''     findISDN=input("请输入ISDN编号:")     for b in range(0,len(bookISDN)):       if bookISDN[b]==findISDN:         namenum=b         print(b)         print("成功查找到书籍：",canlendbook[b])         bookname=canlendbook[b]         print("*********************************")         print("请确认信息，无误请按Y")         print()         print("书籍名称：",canlendbook[b])         print("书籍ISDN号：",bookISDN[b])         s=input("请确认(Y/N)")         if s=="Y":           end_1=bookISDN[b]+"\r"           end_2=canlendbook[b]+"\r"           open_wj("ISDN.txt",end_1)           open_wj("lended.txt",end_2)           canlendbook.pop(b)           bookISDN.pop(b)           word_1=canlendbook[0]+"\r"           word_2=bookISDN[0]+"\r"           open_wf("can lend.txt",word_1)           open_wf("bookISDN.txt",word_2)           for b in range(0,len(bookISDN)-1):             word_1=canlendbook[b+1]+"\r"             word_2=bookISDN[b+1]+"\r"             open_wj("can lend.txt",word_1)             open_wj("bookISDN.txt",word_2)                      '''seewords=open_r1("seeword.txt")           for i in range(0,len(seewords)):             seewords[i]=seewords[i].rstrip("\n")           seewords[seenum+1]=str(seewords[seenum])+","+str(namenum)           word=seewords[0]+"\n"           open_wf("seeword.txt",word)           for i in range(0,len(seewords)-1):             word=seewords[i+1]+"\n"             open_wj("seeword.txt",word)'''           if int(points[seenum])>0:             points[seenum]=str(int(points[seenum])-1)             word=points[0]+"\r"             open_wf("point.txt",word)             for t in range(0,len(points)):               word=points[t-1]+"\r"               open_wj("point.txt",word)             print("处理成功，您可再借出",points[seenum],"本书")             main()           else:             print("您借的书已达到5本，请先还书")             main()         else:           main()       else:         if b==len(bookISDN)-1:           word="找不到书籍'"+bookname+"',请检查拼写或此书已借出"           msgbox("1",word)           main()  

还书

def return_book():   isdn=open_r1("ISDN.txt")   namebook=open_r1("lended.txt")   for i in range(0,len(isdn)):     isdn[i]=isdn[i].rstrip("\n")     namebook[i]=namebook[i].rstrip("\n")   print('''请选择还书方式： **************** ***1.查找书名*** ***2.查找书号*** ****************''')   s=input("choose:")   if s=="1":     s=input("书籍名称：")     for x in range(0,len(namebook)):       if s==namebook[x]:         print("成功找到书籍",namebook[x])         print("*********************************")         print("请确认信息，无误请按Y")         print()         print("书籍名称：",namebook[x])         print("书籍ISDN号：",isdn[x])         s=input("请确认(Y/N)")         if s=="Y":           word_1=namebook[x]+"\r"           word_2=isdn[x]+"\r"           open_wj("can lend.txt",word_1)           open_wj("bookISDN.txt",word_2)           isdn.pop(x)           namebook.pop(x)           word1=isdn[0]+"\r"           word2=namebook[0]+"\r"           open_wf("lended.txt",word2)           open_wf("ISDN.txt",word1)           for i in range(0,len(isdn)-1):             word_1=isdn[i+1]+"\r"             word_2=namebook[i+1]+"\r"                        open_wj("ISDN.txt",word_1)             open_wj("lended.txt",word_2)           points=open_r1("point.txt")           for i in range(0,len(points)):             points[i]=points[i].rstrip("\n")           points[seenum]=str(int(points[seenum])+1)           word=points[0]+"\r"           open_wf("point.txt",word)           for t in range(0,len(points)):             word=points[t-1]+"\r"             open_wj("point.txt",word)           main()         elif s=="N":           main()       else:         if x==len(namebook)-1:           print("没有找到图书'",s,"',请检查拼写是否正确")           main()   elif s=="2":          s=input("请输入ISDN号：")     for x in range(0,len(isdn)):       if s==isdn[x]:         print("成功找到书籍",namebook[x])         print("*********************************")         print("请确认信息，无误请按Y")         print()         print("书籍名称：",namebook[x])         print("书籍ISDN号：",isdn[x])         s=input("请确认(Y/N)")         if s=="Y":           word_1=namebook[x]+"\r"           word_2=isdn[x]+"\r"           open_wj("can lend.txt",word_1)           open_wj("bookISDN.txt",word_2)           isdn.pop(x)           namebook.pop(x)           word1=isdn[0]+"\r"           word2=namebook[0]+"\r"           open_wf("lended.txt",word2)           open_wf("ISDN.txt",word1)           for i in range(0,len(isdn)-1):             word_1=isdn[i+1]+"\r"             word_2=namebook[i+1]+"\r"             open_wj("ISDN.txt",word_1)             open_wj("lended.txt",word_2)           points=open_r1("point.txt")           for i in range(0,len(points)):             points[i]=points[i].rstrip("\n")           points[seenum]=str(int(points[seenum])+1)           word=points[0]+"\r"           open_wf("point.txt",word)           for t in range(0,len(points)):             word=points[t-1]+"\r"             open_wj("point.txt",word)           main()         elif s=="N":           main()       else:         if x==len(namebook)-1:           print("没有找到图书'",s,"',请检查拼写是否正确")           main()  

显示全部书籍

def view_all():   inbook=open_r1("can lend.txt")   inISDN=open_r1("bookISDN.txt")   borbook=open_r1("lended.txt")   borISDN=open_r1("ISDN.txt")   for b in range(0,len(inbook)):     inbook[b]=inbook[b].rstrip("\n")     inISDN[b]=inISDN[b].rstrip("\n")   for c in range(0,len(borbook)):     borbook[c]=borbook[c].rstrip("\n")     borISDN[c]=borISDN[c].rstrip("\n")   print("本馆内现有的图书(数量：",len(inbook),"本)")   print("*****************************************")   print("书名         ISDN（分区，书号）")   for i in range(0,len(inbook)):     print(inbook[i],"         ",inISDN[i])   print("本馆已借出的图书(数量：",len(borbook),"本)")   print("*****************************************")   print("书名         ISDN（分区，书号）")   for i in range(0,len(borbook)):     print(borbook[i],"         ",borISDN[i])   print("*****************************************")   main()  

添加图书

def add_book():   permission=open_r("per.txt")   if permission=="true":     print("欢迎来到图书添加系统")     a_name=input("请输入书籍名称：")     a_ISDN=input("请输入ISDN编号：")     word_1=a_name+"\r"     word_2=a_ISDN+"\r"     open_wj("can lend.txt",word_1)     open_wj("bookISDN.txt",word_2)     print('''请选择： *************** **1.继续添加*** **2.退出添加*** ***************''')     s=input("choose:")     if s=="1":       add_book()     elif s=="2":       main()   else:     print("您不是管理员，没有修改权限")     main()  

全部代码

import tkinter import tkinter.messagebox import random import time #used #a,b,c,d,e,f,g,h,i,j,k #a, #参数设置 c=[] seenum=0 permission=0 # def open_wf(name,write):   str(write)   with open(name,"w",encoding="utf-8") as f:     f.write(write)     f.close()   return True def open_wj(name,write):   str(write)   with open(name,"a",encoding="utf-8") as f:     f.write(write)     f.close()   return True def open_r(name):     with open (name,"r",encoding="utf-8") as f:         data = f.readline()         f.close()     return data def open_r1(name):     with open (name,"r",encoding="utf-8") as f:         data = f.readlines()         f.close()     return data  def now():     times=time.localtime()     now=str(times.tm_hour)+":"+str(times.tm_min)+":"+str(times.tm_sec)     return now def msgbox(flag,word):     if flag=="1":         print(word)     elif flag=="2":         print(word) def login():     usrall=open_r1("usrinfo.txt")     number=open_r1("number.txt")     #去掉\n     for a in range(0,len(usrall)):         usrall[a]=usrall[a].rstrip("\n")     name=[]     for b in range(0,len(number)):         number[b]=number[b].rstrip("\n")     name=[]     seenum=0          print('''欢迎来到登录系统 提示：注册系统暂时关闭 *please choose:* **************** *****1.登录***** *****2.EMPTY**** ****************''')     cho_0=input("*********choose:")     go="0"     if cho_0=="1":         name_i=input("用户名：")         number_i=input("密码：")         if len(usrall)==len(number):           for c in range(0,len(usrall)):             if usrall[c]==name_i and number[c]==number_i:               word=name_i+",登陆成功"               msgbox("2",word)               permission="none"               open_wf("per.txt",permission)               seenum=c                              main()             elif "admin"==name_i and "admin123"==number_i:               msgbox("2","管理员登陆成功")               w=input("警告：管理员禁止操作借、还书系统！！！")               time.sleep(1)               permission="true"               open_wf("per.txt",permission)               print(permission)               seenum=c               main()             elif c==len(usrall)-1:               msgbox("1","用户名或密码错误")               login()         else:           msgbox("1"," ): 程序遇到未知错误,请检查配置")     elif cho_0=="2":       print("注册系统已关闭")       login()       while (1==2):         start="1"         newname=input("请输入用户名：")         newnum=input("请输入密码：")         for d in range(0,len(usrall)):           if newname==usrall[d]:             msgobx("2","用户名已存在")             break           else:             start="0"         if start=="0":           newname=newname+"\r"           newnum=newnum+"\r"           open_wj("usrinfo.txt",newname)           open_wj("number.txt",newnum)           word="5"+"\r"           open_wj("point.txt",word)           word="\r"           open_wj("seeword.txt",word)           msgbox("2","新用户创建成功，请重启系统登录")         else:           s=0 def main():   print('''欢迎来到图书管理系统 *******please choose:********* ****************************** **********0.显示全部********** ***1.借书********2.还书******* ***3.添加图书****4.删除图书*** ***5.修改图书****6.修改信息*** ***7.退出登录****8.退出******* ******************************''')   s=input("choose:")   if s=="1":     lend_book()   elif s=="0":     view_all()   elif s=="2":     return_book()   elif s=="3":     add_book()   elif s=="7":     back_to_login()   elif s=="8":     exit() #借书 def lend_book():   canlendbook=open_r1("can lend.txt")   bookISDN=open_r1("bookISDN.txt")   points=open_r1("point.txt")   for b in range(0,len(canlendbook)):     canlendbook[b]=canlendbook[b].rstrip("\n")     bookISDN[b]=bookISDN[b].rstrip("\n")   for c in range(0,len(points)):     points[c]=points[c].rstrip("\n")      print('''请选择: **************** ***1.查找书名*** ***2.查找书号*** ****************''')   s=input("choose:")   if s=="1":     bookname=input("请输入书名：")     for b in range(0,len(canlendbook)):       if canlendbook[b]==bookname:         print("成功查找到书籍:",bookname)         print("*********************************")         print("请确认信息，无误请按Y")         print()         print("书籍名称：",canlendbook[b])         print("书籍ISDN号：",bookISDN[b])         s=input("请确认(Y/N)")         if s=="Y":           end_1=bookISDN[b]+"\r"           end_2=canlendbook[b]+"\r"           open_wj("ISDN.txt",end_1)           open_wj("lended.txt",end_2)           canlendbook.pop(b)           bookISDN.pop(b)           word_1=canlendbook[0]+"\r"           word_2=bookISDN[0]+"\r"           open_wf("can lend.txt",word_1)           open_wf("bookISDN.txt",word_2)           for b in range(0,len(bookISDN)-1):             word1=canlendbook[b+1]+"\r"             word2=bookISDN[b+1]+"\r"             open_wj("can lend.txt",word1)             open_wj("bookISDN.txt",word2)           if int(points[seenum])>0:             points[seenum]=str(int(points[seenum])-1)             word=points[0]+"\r"             open_wf("point.txt",word)             for t in range(0,len(points)):               word=points[t-1]+"\r"               open_wj("point.txt",word)             print("处理成功，您可再借出",points[seenum],"本书")             main()             break           else:             print("您借的书已达到5本，请先还书")             main()             break         else:           main()       elif b==len(canlendbook)-1:         word="找不到书籍'"+bookname+"',请检查拼写或此书已借出"         msgbox("1",word)         main()         break   elif s=="2":     '''namenum=0'''     findISDN=input("请输入ISDN编号:")     for b in range(0,len(bookISDN)):       if bookISDN[b]==findISDN:         namenum=b         print(b)         print("成功查找到书籍：",canlendbook[b])         bookname=canlendbook[b]         print("*********************************")         print("请确认信息，无误请按Y")         print()         print("书籍名称：",canlendbook[b])         print("书籍ISDN号：",bookISDN[b])         s=input("请确认(Y/N)")         if s=="Y":           end_1=bookISDN[b]+"\r"           end_2=canlendbook[b]+"\r"           open_wj("ISDN.txt",end_1)           open_wj("lended.txt",end_2)           canlendbook.pop(b)           bookISDN.pop(b)           word_1=canlendbook[0]+"\r"           word_2=bookISDN[0]+"\r"           open_wf("can lend.txt",word_1)           open_wf("bookISDN.txt",word_2)           for b in range(0,len(bookISDN)-1):             word_1=canlendbook[b+1]+"\r"             word_2=bookISDN[b+1]+"\r"             open_wj("can lend.txt",word_1)             open_wj("bookISDN.txt",word_2)                      '''seewords=open_r1("seeword.txt")           for i in range(0,len(seewords)):             seewords[i]=seewords[i].rstrip("\n")           seewords[seenum+1]=str(seewords[seenum])+","+str(namenum)           word=seewords[0]+"\n"           open_wf("seeword.txt",word)           for i in range(0,len(seewords)-1):             word=seewords[i+1]+"\n"             open_wj("seeword.txt",word)'''           if int(points[seenum])>0:             points[seenum]=str(int(points[seenum])-1)             word=points[0]+"\r"             open_wf("point.txt",word)             for t in range(0,len(points)):               word=points[t-1]+"\r"               open_wj("point.txt",word)             print("处理成功，您可再借出",points[seenum],"本书")             main()           else:             print("您借的书已达到5本，请先还书")             main()         else:           main()       else:         if b==len(bookISDN)-1:           word="找不到书籍'"+bookname+"',请检查拼写或此书已借出"           msgbox("1",word)           main() def view_all():   inbook=open_r1("can lend.txt")   inISDN=open_r1("bookISDN.txt")   borbook=open_r1("lended.txt")   borISDN=open_r1("ISDN.txt")   for b in range(0,len(inbook)):     inbook[b]=inbook[b].rstrip("\n")     inISDN[b]=inISDN[b].rstrip("\n")   for c in range(0,len(borbook)):     borbook[c]=borbook[c].rstrip("\n")     borISDN[c]=borISDN[c].rstrip("\n")   print("本馆内现有的图书(数量：",len(inbook),"本)")   print("*****************************************")   print("书名         ISDN（分区，书号）")   for i in range(0,len(inbook)):     print(inbook[i],"         ",inISDN[i])   print("本馆已借出的图书(数量：",len(borbook),"本)")   print("*****************************************")   print("书名         ISDN（分区，书号）")   for i in range(0,len(borbook)):     print(borbook[i],"         ",borISDN[i])   print("*****************************************")   main() def return_book():   isdn=open_r1("ISDN.txt")   namebook=open_r1("lended.txt")   for i in range(0,len(isdn)):     isdn[i]=isdn[i].rstrip("\n")     namebook[i]=namebook[i].rstrip("\n")   print('''请选择还书方式： **************** ***1.查找书名*** ***2.查找书号*** ****************''')   s=input("choose:")   if s=="1":     s=input("书籍名称：")     for x in range(0,len(namebook)):       if s==namebook[x]:         print("成功找到书籍",namebook[x])         print("*********************************")         print("请确认信息，无误请按Y")         print()         print("书籍名称：",namebook[x])         print("书籍ISDN号：",isdn[x])         s=input("请确认(Y/N)")         if s=="Y":           word_1=namebook[x]+"\r"           word_2=isdn[x]+"\r"           open_wj("can lend.txt",word_1)           open_wj("bookISDN.txt",word_2)           isdn.pop(x)           namebook.pop(x)           word1=isdn[0]+"\r"           word2=namebook[0]+"\r"           open_wf("lended.txt",word2)           open_wf("ISDN.txt",word1)           for i in range(0,len(isdn)-1):             word_1=isdn[i+1]+"\r"             word_2=namebook[i+1]+"\r"                        open_wj("ISDN.txt",word_1)             open_wj("lended.txt",word_2)           points=open_r1("point.txt")           for i in range(0,len(points)):             points[i]=points[i].rstrip("\n")           points[seenum]=str(int(points[seenum])+1)           word=points[0]+"\r"           open_wf("point.txt",word)           for t in range(0,len(points)):             word=points[t-1]+"\r"             open_wj("point.txt",word)           main()         elif s=="N":           main()       else:         if x==len(namebook)-1:           print("没有找到图书'",s,"',请检查拼写是否正确")           main()   elif s=="2":          s=input("请输入ISDN号：")     for x in range(0,len(isdn)):       if s==isdn[x]:         print("成功找到书籍",namebook[x])         print("*********************************")         print("请确认信息，无误请按Y")         print()         print("书籍名称：",namebook[x])         print("书籍ISDN号：",isdn[x])         s=input("请确认(Y/N)")         if s=="Y":           word_1=namebook[x]+"\r"           word_2=isdn[x]+"\r"           open_wj("can lend.txt",word_1)           open_wj("bookISDN.txt",word_2)           isdn.pop(x)           namebook.pop(x)           word1=isdn[0]+"\r"           word2=namebook[0]+"\r"           open_wf("lended.txt",word2)           open_wf("ISDN.txt",word1)           for i in range(0,len(isdn)-1):             word_1=isdn[i+1]+"\r"             word_2=namebook[i+1]+"\r"             open_wj("ISDN.txt",word_1)             open_wj("lended.txt",word_2)           points=open_r1("point.txt")           for i in range(0,len(points)):             points[i]=points[i].rstrip("\n")           points[seenum]=str(int(points[seenum])+1)           word=points[0]+"\r"           open_wf("point.txt",word)           for t in range(0,len(points)):             word=points[t-1]+"\r"             open_wj("point.txt",word)           main()         elif s=="N":           main()       else:         if x==len(namebook)-1:           print("没有找到图书'",s,"',请检查拼写是否正确")           main() def add_book():   permission=open_r("per.txt")   if permission=="true":     print("欢迎来到图书添加系统")     a_name=input("请输入书籍名称：")     a_ISDN=input("请输入ISDN编号：")     word_1=a_name+"\r"     word_2=a_ISDN+"\r"     open_wj("can lend.txt",word_1)     open_wj("bookISDN.txt",word_2)     print('''请选择： *************** **1.继续添加*** **2.退出添加*** ***************''')     s=input("choose:")     if s=="1":       add_book()     elif s=="2":       main()   else:     print("您不是管理员，没有修改权限")     main() def back_to_login():   ch=input("确认退出登录？(Y/N)")   if ch=="Y":     print("已成功退出登录")     login()   elif ch++"N":     main() login()  

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