用python实现简易图书管理系统_python图书管理系统代码
程序员老冉 2024-07-04 11:35:01 阅读 82
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：
<code>def open_wf(name,write):#写入txt（覆盖）
str(write)
with open(name,"w",encoding="utf-8") as f:code>
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:code>
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:code>
data = f.readline()
f.close()
return data
def open_r1(name):#全部读取
with open (name,"r",encoding="utf-8") as f:code>
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"code>
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"code>
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"code>
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"code>
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"code>
if start=="0":
newname=newname+"\r"
newnum=newnum+"\r"
open_wj("usrinfo.txt",newname)
open_wj("number.txt",newnum)
word="5"+"\r"code>
open_wj("point.txt",word)
word="\r"code>
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"code>
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"code>
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:code>
f.write(write)
f.close()
return True
def open_wj(name,write):
str(write)
with open(name,"a",encoding="utf-8") as f:code>
f.write(write)
f.close()
return True
def open_r(name):
with open (name,"r",encoding="utf-8") as f:code>
data = f.readline()
f.close()
return data
def open_r1(name):
with open (name,"r",encoding="utf-8") as f:code>
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"code>
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"code>
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"code>
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"code>
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"code>
if start=="0":
newname=newname+"\r"
newnum=newnum+"\r"
open_wj("usrinfo.txt",newname)
open_wj("number.txt",newnum)
word="5"+"\r"code>
open_wj("point.txt",word)
word="\r"code>
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"code>
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"code>
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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