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用python实现简易图书管理系统

2026-11-04 19:26:43 来源:互联网转载

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 Truedef 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 Truedef open_r(name):#读取(仅第一行)    with open (name,"r",encoding="utf-8") as f:        data = f.readline()        f.close()    return datadef open_r1(name):#全部读取    with open (name,"r",encoding="utf-8") as f:        data = f.readlines()        f.close()    return datadef now():    times=time.localtime()    now=str(times.tm_hour)+":"+str(times.tm_min)+":"+str(time.tm_sec)    return nowdef 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 tkinterimport tkinter.messageboximport randomimport time#used#a,b,c,d,e,f,g,h,i,j,k#a,#参数设置c=[]seenum=0permission=0#def open_wf(name,write):  str(write)  with open(name,"w",encoding="utf-8") as f:    f.write(write)    f.close()  return Truedef open_wj(name,write):  str(write)  with open(name,"a",encoding="utf-8") as f:    f.write(write)    f.close()  return Truedef open_r(name):    with open (name,"r",encoding="utf-8") as f:        data = f.readline()        f.close()    return datadef open_r1(name):    with open (name,"r",encoding="utf-8") as f:        data = f.readlines()        f.close()    return datadef now():    times=time.localtime()    now=str(times.tm_hour)+":"+str(times.tm_min)+":"+str(times.tm_sec)    return nowdef 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=0def 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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