diff --git a/书籍管理系统.py b/书籍管理系统.py
new file mode 100644
index 0000000..b4db1e0
--- /dev/null
+++ b/书籍管理系统.py
@@ -0,0 +1,877 @@
+import tkinter
+import xlrd
+import xlwt
+import os
+from tkinter import *
+from xlutils import copy
+from tkinter import messagebox
+import datedays
+#创建窗口
+def createwin():
+    window=Tk()
+    window.title('书籍管理系统')
+    window.geometry('350x800')
+    button1 = tkinter.Button(window, text='退出', command=lambda: window.destroy(), width=7, height=2)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(window, width=22, height=1, command=lambda: createentry(), text='添加书籍');
+    button2.place(x=100, y=200)
+    button3 = tkinter.Button(window, width=22, height=1, command=lambda: addUser(), text='添加用户');
+    button3.place(x=100, y=250)
+    button4 = tkinter.Button(window, width=22, height=1, command=lambda: modifybook(), text='修改书籍');
+    button4.place(x=100, y=300)
+    button5 = tkinter.Button(window, width=22, height=1, command=lambda: modifyuser(), text='修改用户');
+    button5.place(x=100, y=350)
+    button6 = tkinter.Button(window, width=22, height=1, command=lambda: lookbook(), text='查看书籍信息');
+    button6.place(x=100, y=100)
+    button7 = tkinter.Button(window, width=22, height=1, command=lambda: rookbook(), text='查看用户信息');
+    button7.place(x=100, y=150)
+    button8 = tkinter.Button(window, width=22, height=1, command=lambda: allbook(), text='超时未还书借书者信息');
+    button8.place(x=100, y=400)
+    button9 = tkinter.Button(window, width=22, height=1, command=lambda: searchbook(), text='查询书籍信息');
+    button9.place(x=100, y=450)
+    button10 = tkinter.Button(window, width=22, height=1, command=lambda: checkhistory(), text='查询用户信息');
+    button10.place(x=100, y=500)
+    button11 = tkinter.Button(window, width=22, height=1, command=lambda: borrowbook(), text='借书');
+    button11.place(x=100, y=550)
+    button12 = tkinter.Button(window, width=22, height=1, command=lambda: returnbook(), text='还书');
+    button12.place(x=100, y=600)
+    button13 = tkinter.Button(window, width=22, height=1, command=lambda: deletebook(), text='删除书籍');
+    button13.place(x=100, y=650)
+    button14 = tkinter.Button(window, width=22, height=1, command=lambda: deleteuser(), text='删除用户');
+    button14.place(x=100, y=700)
+    return window
+
+
+
+#查看书籍信息
+def lookbook():
+    lookbook=Tk()
+    lookbook.title('书籍信息')
+    lookbook.geometry('1600x500')
+    roll=tkinter.Scrollbar(lookbook)
+    roll.pack(side=tkinter.RIGHT,fill=tkinter.Y)
+    text_input=tkinter.Text(lookbook,width=800,height=500)
+    text_input.insert('insert',getvar1())
+    text_input.pack(expand=tkinter.YES,fill=tkinter.BOTH)
+    text_input.config(yscrollcommand=roll.set)
+    roll.config(command=text_input.yview)
+
+#获取书籍信息表格中的内容
+def getvar1():
+    xls=xlrd.open_workbook('书籍信息.xls')
+    sheet=xls.sheet_by_index(0)
+    table = xls.sheets()[0]
+    n=table.nrows
+    listindes=""
+    for i in range(0,n):
+        for j in range(0,7):
+            listindes=listindes+str(sheet.cell_value(i,j))+"\t\t\t\t"
+        listindes=listindes+"\n"
+    return listindes
+
+#查看借书者信息
+def rookbook():
+    rookbook=Tk()
+    rookbook.title('用户信息')
+    rookbook.geometry('700x500')
+    roll=tkinter.Scrollbar(rookbook)
+    roll.pack(side=tkinter.RIGHT,fill=tkinter.Y)
+    text_input=tkinter.Text(rookbook,width=800,height=500)
+    text_input.insert('insert',showUsers())
+    text_input.pack(expand=tkinter.YES,fill=tkinter.BOTH)
+    text_input.config(yscrollcommand=roll.set)
+    roll.config(command=text_input.yview)
+
+
+
+# 显示所有借书者信息
+def showUsers():
+    # 获取所有用户信息Excel文件的文件名
+    path = '用户信息\\'
+    files = os.listdir(path)
+    users = []
+    for file in files:
+        if file.endswith('.xls'):
+            users.append(file)
+    st = "姓名\t\t\t性别\t\t\t年龄\t\t\t借书账号\t\t\t"
+    for user in users:
+        s = path + user
+        book = xlrd.open_workbook(s)
+        sheet = book.sheet_by_index(0)
+        st=st+"\n"
+        for j in range(sheet.ncols-5):
+            st = st+str(sheet.cell_value(1, j)) + "\t\t\t"
+    return st
+
+# 统计超过期限未还书的借书者并输出借书者信息
+def overdueUsers():
+    date = datedays.getnow()
+    # 获取所有用户信息Excel文件的文件名
+    path = '用户信息\\'
+    files = os.listdir(path)
+    users = []
+    for file in files:
+        if file.endswith('.xls'):
+            users.append(file)
+    st = "姓名\t\t\t性别\t\t\t年龄\t\t\t借书账号\t\t\t借书日期\t\t\t书籍编号\t\t\t借书书名\t\t\t应还书日期\t\t\t是否已还书"
+    st = st + "\n"
+    for user in users:
+        s = path + user
+        book = xlrd.open_workbook(s)
+        sheet = book.sheet_by_index(0)
+        t=0
+        for i in range(1, sheet.nrows):
+            return_date = str(sheet.cell_value(i, 7))
+            status = sheet.cell_value(i, 8)
+            if status == '否' and return_date < date:
+                if t==0:
+                    t=1
+                    for k in range(0,4):
+                        st=st+str(sheet.cell_value(1,k))+"\t\t\t"
+                    for k in range(4,9):
+                        st=st+str(sheet.cell_value(i,k))+"\t\t\t"
+                else:
+                    for j in range(sheet.ncols):
+                        st = st + str(sheet.cell_value(i, j)) + "\t\t\t"
+                st = st + "\n"
+    return st
+
+#输出超过期限未还书的借书者信息
+def allbook():
+    allbook=Tk()
+    allbook.title('超时未还书借书者信息')
+    allbook.geometry('1600x500')
+    roll=tkinter.Scrollbar(allbook)
+    roll.pack(side=tkinter.RIGHT,fill=tkinter.Y)
+    text_input=tkinter.Text(allbook,width=1000,height=500)
+    text_input.insert('insert',overdueUsers())
+    text_input.pack(expand=tkinter.YES,fill=tkinter.BOTH)
+    text_input.config(yscrollcommand=roll.set)
+    roll.config(command=text_input.yview)
+
+
+
+#创建新用户表格，表格以借书账号命名，添加用户信息
+def addUser():
+    #创建用于输入添加的用户的信息的窗口
+    addusers = Tk()
+    addusers.title('添加用户')
+    addusers.geometry('275x250')
+    button1 = tkinter.Button(addusers, text='退出', command=lambda: addusers.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(addusers, width=8, height=1,command=lambda: getentry2(addusers, entry1, entry2, entry3, entry4), text='确认');
+    button2.place(x=100, y=175)
+    text1 = tkinter.Label(addusers, bd=4, fg='black', text='姓名：')
+    text1.place(x=20, y=45)
+    text2 = tkinter.Label(addusers, bd=4, fg='black', text='性别：')
+    text2.place(x=20, y=70)
+    text3 = tkinter.Label(addusers, bd=4, fg='black', text='年龄：')
+    text3.place(x=20, y=95)
+    text4 = tkinter.Label(addusers, bd=4, fg='black', text='借书账号：')
+    text4.place(x=20, y=120)
+    entry1 = tkinter.Entry(addusers, width=20, show='')
+    entry1.place(x=100, y=50)
+    entry2 = tkinter.Entry(addusers, width=20, show='')
+    entry2.place(x=100, y=75)
+    entry3 = tkinter.Entry(addusers, width=20, show='')
+    entry3.place(x=100, y=100)
+    entry4 = tkinter.Entry(addusers, width=20, show='')
+    entry4.place(x=100, y=125)
+def getentry2(addusers, entry1, entry2, entry3, entry4):
+    #判断输入是否完整，避免保存错误信息
+    if entry1.get()=="" or entry2.get()=="" or entry3.get()=="" or entry4.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入完整信息！')
+        return
+    data = []
+    data.append(str(entry1.get()))
+    data.append(str(entry2.get()))
+    data.append(str(entry3.get()))
+    data.append(str(entry4.get()))
+    for i in range(0,5):
+        data.append("无")
+    s = '用户信息' + '\\' + data[3] + '.xls'
+    #判断是否已有用户，避免重复添加用户造成报错
+    if not os.path.exists(s):
+        book = xlwt.Workbook(encoding='utf-8', style_compression=0)
+        sheet = book.add_sheet('用户管理系统', cell_overwrite_ok=True)
+        col = ('姓名', '性别', '年龄', '借书账号', '借书日期', '书籍编号', '借书书名', '应还书日期', '是否已还书')
+        for i in range(0, 9):
+            sheet.write(0, i, col[i])
+        book.save(s)
+        xls = xlrd.open_workbook(s)
+        wbook = copy.copy(xls)
+        wsheet = wbook.get_sheet(0)
+        table = xls.sheets()[0]
+        n = table.nrows
+        for i in range(len(data)):
+            wsheet.write(n, i, data[i])
+        wbook.save(s)
+        tkinter.messagebox.showinfo('提示', '添加成功！')
+    else:
+        tkinter.messagebox.showerror('错误', '添加失败，用户已存在！')
+    addusers.destroy()
+
+#添加书籍
+def getentry(addwin,entry1,entry2,entry3,entry4,entry5,entry6,entry7):
+    #判断输入框是否输入完整，防止存到错误信息
+    if entry1.get()=="" or entry2.get()=="" or entry3.get()=="" or entry4.get()=="" or entry5.get()=="" or entry6.get()=="" or entry7.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入完整信息！')
+        return
+    xls = xlrd.open_workbook('书籍信息.xls')
+    wbook = copy.copy(xls)
+    wsheet = wbook.get_sheet(0)
+    sheet = xls.sheet_by_index(0)
+    table = xls.sheets()[0]
+    n = table.nrows
+    t=0
+    #避免书籍信息重复添加
+    for i in range(0, n):
+        if entry5.get()==sheet.cell_value(i,4):
+            t=1
+            tkinter.messagebox.showerror('错误', '添加失败，已有书籍信息！')
+            break
+    #添加书籍信息，写入表格
+    if t==0:
+        data=[]
+        data.append(str(entry1.get()))
+        data.append(str(entry2.get()))
+        data.append(str(entry3.get()))
+        data.append(str(entry4.get()))
+        data.append(str(entry5.get()))
+        data.append(str(entry6.get()))
+        data.append(str(entry7.get()))
+        n = table.nrows
+        for i in range(len(data)):
+            wsheet.write(n, i, data[i])
+        wbook.save('书籍信息.xls')
+        tkinter.messagebox.showinfo('提示', '添加成功！')
+    #关闭窗口
+    addwin.destroy()
+def createentry():
+    #创建输入需要添加的书籍的信息的窗口
+    addwin=Tk()
+    addwin.title('添加书籍')
+    addwin.geometry('275x300')
+    button1 = tkinter.Button(addwin, text='退出', command=lambda: addwin.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(addwin, width=8, height=1, command=lambda:getentry(addwin,entry1,entry2,entry3,entry4,entry5,entry6,entry7) , text='确认');
+    button2.place(x=100, y=250)
+    text1 = tkinter.Label(addwin, bd=4, fg='black', text='书名：')
+    text1.place(x=20,y=45)
+    text2 = tkinter.Label(addwin, bd=4, fg='black', text='作者：')
+    text2.place(x=20, y=70)
+    text3 = tkinter.Label(addwin, bd=4, fg='black', text='出版社：')
+    text3.place(x=20, y=95)
+    text4 = tkinter.Label(addwin, bd=4, fg='black', text='出版日期：')
+    text4.place(x=20, y=120)
+    text5 = tkinter.Label(addwin, bd=4, fg='black', text='书籍编号：')
+    text5.place(x=20, y=145)
+    text6 = tkinter.Label(addwin, bd=4, fg='black', text='书籍位置：')
+    text6.place(x=20, y=170)
+    text7 = tkinter.Label(addwin, bd=4, fg='black', text='库存量：')
+    text7.place(x=20, y=195)
+    entry1 = tkinter.Entry(addwin, width=20, show='')
+    entry1.place(x=100, y=50)
+    entry2 = tkinter.Entry(addwin, width=20, show='')
+    entry2.place(x=100, y=75)
+    entry3 = tkinter.Entry(addwin, width=20, show='')
+    entry3.place(x=100, y=100)
+    entry4 = tkinter.Entry(addwin, width=20, show='')
+    entry4.place(x=100, y=125)
+    entry5 = tkinter.Entry(addwin, width=20, show='')
+    entry5.place(x=100, y=150)
+    entry6 = tkinter.Entry(addwin, width=20, show='')
+    entry6.place(x=100, y=175)
+    entry7 = tkinter.Entry(addwin, width=20, show='')
+    entry7.place(x=100, y=200)
+
+
+
+
+#修改书籍信息
+def modifybook():
+    modifywin = Tk()
+    modifywin.title('修改书籍信息')
+    modifywin.geometry('275x200')
+    button1 = tkinter.Button(modifywin, text='退出', command=lambda: modifywin.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    text1 = tkinter.Label(modifywin, bd=4, fg='black', text='书籍编号：')
+    text1.place(x=20, y=45)
+    entry1 = tkinter.Entry(modifywin, width=20, show='')
+    entry1.place(x=100, y=50)
+    button2 = tkinter.Button(modifywin, width=8, height=1, command=lambda: getentry_mod(modifywin,entry1), text='确认');
+    button2.place(x=100, y=150)
+def getentry_mod(modify,entry1):
+    if entry1.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入书籍编号！')
+        return
+    bookid=entry1.get()
+    modify.destroy()
+    # 打开Excel文件
+    xls = xlrd.open_workbook('书籍信息.xls')
+    # 复制一份Excel文件以便修改
+    wbook = copy.copy(xls)
+    # 获取工作表
+    wsheet = wbook.get_sheet(0)
+    table = xls.sheets()[0]
+    n = table.nrows
+    # 查找对应书籍编号
+    for i in range(1, n):
+        if table.cell(i, 4).value == bookid:
+            # 创建修改书籍信息窗口
+            modifywin = Tk()
+            modifywin.title('修改书籍信息')
+            modifywin.geometry('275x250')
+            # 添加标签和输入框
+            tkinter.Label(modifywin, bd=4, fg='black', text='书名：').place(x=20, y=25)
+            entry1 = tkinter.Entry(modifywin, width=20, justify='right')
+            entry1.insert(0, table.cell(i, 0).value)
+            entry1.place(x=100, y=25)
+            tkinter.Label(modifywin, bd=4, fg='black', text='作者：').place(x=20, y=50)
+            entry2 = tkinter.Entry(modifywin, width=20, justify='right')
+            entry2.insert(0, table.cell(i, 1).value)
+            entry2.place(x=100, y=50)
+            tkinter.Label(modifywin, bd=4, fg='black', text='出版社：').place(x=20, y=75)
+            entry3 = tkinter.Entry(modifywin, width=20, justify='right')
+            entry3.insert(0, table.cell(i, 2).value)
+            entry3.place(x=100, y=75)
+            tkinter.Label(modifywin, bd=4, fg='black', text='出版日期：').place(x=20, y=100)
+            entry4 = tkinter.Entry(modifywin, width=20, justify='right')
+            entry4.insert(0, table.cell(i, 3).value)
+            entry4.place(x=100, y=100)
+            tkinter.Label(modifywin, bd=4, fg='black', text='书籍位置：').place(x=20, y=125)
+            entry5 = tkinter.Entry(modifywin, width=20, justify='right')
+            entry5.insert(0, table.cell(i, 5).value)
+            entry5.place(x=100, y=125)
+            tkinter.Label(modifywin, bd=4, fg='black', text='库存量：').place(x=20, y=150)
+            entry6 = tkinter.Entry(modifywin, width=20, justify='right')
+            entry6.insert(0, table.cell(i, 6).value)
+            entry6.place(x=100, y=150)
+            # 添加确认修改按钮和退出按钮
+            tkinter.Button(modifywin, width=8, height=1, text='确认',command=lambda: getentry_mod_finish(bookid, entry1.get(), entry2.get(), entry3.get(),entry4.get(), entry5.get(), entry6.get(),modifywin)).place(x=100, y=200)
+            tkinter.Button(modifywin, text='退出', command=modifywin.destroy, width=4, height=1).place(relx=1, rely=1,anchor='se')
+            return
+            # 如果书籍编号不存在，弹出提示框
+    tkinter.messagebox.showerror('错误', '该书籍编号不存在！')
+#获取修改书籍信息的窗口的内容并对相应的行进行修改
+def getentry_mod_finish(bookid,entry1,entry2,entry3,entry4,entry5,entry6,modifywin):
+    if entry1=="" or entry2=="" or entry3=="" or entry4=="" or entry5=="" or entry6=="":
+        tkinter.messagebox.showerror('错误', '请输入完整信息！')
+        return
+    xls = xlrd.open_workbook('书籍信息.xls')
+    wbook = copy.copy(xls)
+    wsheet = wbook.get_sheet(0)
+    table = xls.sheets()[0]
+    n = table.nrows
+    for i in range(1, n):
+        if table.cell(i, 4).value == bookid:
+            wsheet.write(i, 0, str(entry1))
+            wsheet.write(i, 1, str(entry2))
+            wsheet.write(i, 2, str(entry3))
+            wsheet.write(i, 3, str(entry4))
+            wsheet.write(i, 5, str(entry5))
+            wsheet.write(i, 6, str(entry6))
+    wbook.save('书籍信息.xls')
+    tkinter.messagebox.showinfo('提示', '修改成功！')
+    modifywin.destroy()
+    return
+
+#修改用户信息
+def modifyuser():
+    modify = Tk()
+    modify.title('修改用户信息')
+    modify.geometry('275x200')
+    text1 = tkinter.Label(modify, bd=4, fg='black', text='借书账号：')
+    text1.place(x=20, y=45)
+    entry = tkinter.Entry(modify, width=20, show='')
+    entry.place(x=100, y=50)
+    button1 = tkinter.Button(modify, text='退出', command=lambda: modify.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(modify, width=8, height=1, command=lambda: getentry3(modify, entry), text='确认');
+    button2.place(x=100, y=100)
+#创建窗口，显示用户信息并进行修改
+def getentry3(modify,entry):
+    if entry.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入用户账号！')
+        return
+    account=entry.get()
+    path = '用户信息' + '\\' + account + '.xls'
+    try:
+        xls = xlrd.open_workbook(path)
+    except:
+        text = tkinter.Label(modify, bd=4, fg='red', text='用户不存在！')
+        text.place(x=90, y=20)
+        return
+    sheet = xls.sheet_by_index(0)
+    data = []
+    for j in range(0, 4):
+        data.append(str(sheet.cell_value(1, j)))
+
+    modify2 = Tk()
+    modify2.title('修改用户信息')
+    modify2.geometry('275x200')
+
+    button1 = tkinter.Button(modify2, text='退出', command=lambda: modify2.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(modify2, width=8, height=1,
+                             command=lambda: updateuser(modify2, account, entry1, entry2, entry3), text='确认修改');
+    button2.place(x=100, y=150)
+    text1 = tkinter.Label(modify2, bd=4, fg='black', text='姓名：')
+    text1.place(x=20, y=45)
+    text2 = tkinter.Label(modify2, bd=4, fg='black', text='性别：')
+    text2.place(x=20, y=70)
+    text3 = tkinter.Label(modify2, bd=4, fg='black', text='年龄：')
+    text3.place(x=20, y=95)
+
+    entry1 = tkinter.Entry(modify2, width=20, show='')
+    entry1.insert(0, data[0])
+    entry1.place(x=100, y=50)
+    entry2 = tkinter.Entry(modify2, width=20, show='')
+    entry2.insert(0, data[1])
+    entry2.place(x=100, y=75)
+    entry3 = tkinter.Entry(modify2, width=20, show='')
+    entry3.insert(0, data[2])
+    entry3.place(x=100, y=100)
+    modify.destroy()
+
+#更新用户信息表格中的指定用户的信息
+def updateuser(modify2, account, entry1,entry2,entry3):
+    if entry1.get()=="" or entry2.get()=="" or entry3.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入完整信息！')
+        return
+    data = []
+    data.append(entry1.get())
+    data.append(entry2.get())
+    data.append(entry3.get())
+    s = '用户信息' + '\\' + account + '.xls'
+    xls = xlrd.open_workbook(s)
+    wbook = copy.copy(xls)
+    wsheet = wbook.get_sheet(0)
+    table = xls.sheets()[0]
+    for i in range(len(data)):
+        wsheet.write(1,i,data[i])
+    wbook.save(s)
+    tkinter.messagebox.showinfo('提示', '修改成功！')
+    modify2.destroy()
+
+
+
+#查询书籍信息
+def searchbook():
+    search = Tk()
+    search.title('查询书籍信息')
+    search.geometry('275x200')
+    button1 = tkinter.Button(search, text='退出', command=lambda: search.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    text1 = tkinter.Label(search, bd=4, fg='black', text='书籍编号：')
+    text1.place(x=20, y=45)
+    entry1 = tkinter.Entry(search, width=20, show='')
+    entry1.place(x=100, y=50)
+    button2 = tkinter.Button(search, width=8, height=1, command=lambda: getentry_search(entry1.get()), text='确认');
+    button2.place(x=100, y=150)
+def getentry_search(bookid):
+    if bookid=="":
+        tkinter.messagebox.showerror('错误', '请输入要查询的书籍编号！')
+        return
+    # 打开Excel文件
+    xls = xlrd.open_workbook('书籍信息.xls')
+    table = xls.sheets()[0]
+    n = table.nrows
+    # 查找对应书籍编号
+    for i in range(1, n):
+        if table.cell(i, 4).value == bookid:
+            # 创建查询书籍信息窗口
+            seaech = Tk()
+            seaech.title('查询书籍信息')
+            seaech.geometry('275x300')
+            # 添加标签和输入框
+            tkinter.Label(seaech, bd=4, fg='black', text='书名：').place(x=20, y=25)
+            entry1 = tkinter.Entry(seaech, width=20, justify='right')
+            entry1.insert(0, table.cell(i, 0).value)
+            entry1.place(x=100, y=25)
+            tkinter.Label(seaech, bd=4, fg='black', text='作者：').place(x=20, y=50)
+            entry2 = tkinter.Entry(seaech, width=20, justify='right')
+            entry2.insert(0, table.cell(i, 1).value)
+            entry2.place(x=100, y=50)
+            tkinter.Label(seaech, bd=4, fg='black', text='出版社：').place(x=20, y=75)
+            entry3 = tkinter.Entry(seaech, width=20, justify='right')
+            entry3.insert(0, table.cell(i, 2).value)
+            entry3.place(x=100, y=75)
+            tkinter.Label(seaech, bd=4, fg='black', text='出版日期：').place(x=20, y=100)
+            entry4 = tkinter.Entry(seaech, width=20, justify='right')
+            entry4.insert(0, table.cell(i, 3).value)
+            entry4.place(x=100, y=100)
+            tkinter.Label(seaech, bd=4, fg='black', text='书籍位置：').place(x=20, y=125)
+            entry5 = tkinter.Entry(seaech, width=20, justify='right')
+            entry5.insert(0, table.cell(i, 5).value)
+            entry5.place(x=100, y=125)
+            tkinter.Label(seaech, bd=4, fg='black', text='库存量：').place(x=20, y=150)
+            entry6 = tkinter.Entry(seaech, width=20, justify='right')
+            entry6.insert(0, table.cell(i, 6).value)
+            entry6.place(x=100, y=150)
+            # 添加退出按钮
+            tkinter.Button(seaech, text='退出', command=seaech.destroy, width=4, height=1).place(relx=1, rely=1,
+                                                                                                       anchor='se')
+            return
+            # 如果书籍编号不存在，弹出提示框
+    tkinter.messagebox.showerror('错误', '该书籍编号不存在！')
+
+#查阅借阅历史
+def checkhistory():
+    check = Tk()
+    check.title('查询用户信息')
+    check.geometry('275x200')
+    text1 = tkinter.Label(check, bd=4, fg='black', text='借书账号：')
+    text1.place(x=20, y=45)
+    entry1 = tkinter.Entry(check, width=20, show='')
+    entry1.place(x=100, y=50)
+    button1 = tkinter.Button(check, text='退出', command=lambda: check.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(check, width=8, height=1, command=lambda: getentry_check(entry1.get()), text='确认');
+    button2.place(x=100, y=100)
+def getentry_check(account):
+    if account=="":
+        tkinter.messagebox.showerror('错误', '请输入要查询的用户账号！')
+        return
+    path = '用户信息' + '\\' + account + '.xls'
+    try:
+        xls = xlrd.open_workbook(path)
+    except:
+        tkinter.messagebox.showerror('错误', '该用户不存在！')
+        return
+    sheet = xls.sheet_by_index(0)
+    n = sheet.nrows
+    data=[]
+    ss=""
+    for j in range(0, 9):
+        ss = ss + str(sheet.cell_value(0, j)) + "\t\t\t"
+    ss=ss+"\n"
+    for i in range(1, n):
+        data1=[]
+        for j in range(sheet.ncols):
+            data1.append(str(sheet.cell_value(i,j)))
+        data.append(data1)
+    for i in range(0,4):
+        ss=ss+sheet.cell_value(1,i)+"\t\t\t"
+    data.sort(key=lambda x:x[8])
+    t=0
+    for value in data:
+        if t==1:
+            for i in range(0,4):
+                ss=ss+""+"\t\t\t"
+            for i in range(4,len(value)):
+                ss=ss+str(value[i])+"\t\t\t"
+        if t==0:
+            for i in range(4,len(value)):
+                ss=ss+str(value[i])+"\t\t\t"
+                t=1
+        ss=ss+"\n"
+    check = Tk()
+    check.title('查询用户信息')
+    check.geometry('1600x500')
+    roll = tkinter.Scrollbar(check)
+    roll.pack(side=tkinter.RIGHT, fill=tkinter.Y)
+    text_input = tkinter.Text(check, width=800, height=500)
+    text_input.insert('insert', ss)
+    text_input.pack(expand=tkinter.YES, fill=tkinter.BOTH)
+    text_input.config(yscrollcommand=roll.set)
+    roll.config(command=text_input.yview)
+    button1 = tkinter.Button(check, text='退出', command=lambda: check.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+
+#删除书籍信息
+def deletebook():
+    delete = Tk()
+    delete .title('删除书籍信息')
+    delete .geometry('275x200')
+    button1 = tkinter.Button(delete , text='退出', command=lambda: delete.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    text1 = tkinter.Label(delete, bd=4, fg='black', text='书籍编号：')
+    text1.place(x=20, y=45)
+    entry1 = tkinter.Entry(delete, width=20, show='')
+    entry1.place(x=100, y=50)
+    button2 = tkinter.Button(delete, width=8, height=1, command=lambda: getentry_delete(entry1), text='确认');
+    button2.place(x=100, y=150)
+def getentry_delete(entry1):
+    bookid=entry1.get()
+    if bookid=="":
+        tkinter.messagebox.showerror('错误', '请输入要删除的书籍编号！')
+        return
+    # 打开Excel文件
+    xls = xlrd.open_workbook('书籍信息.xls')
+    sheet = xls.sheet_by_index(0)
+    table = xls.sheets()[0]
+    n = table.nrows
+    data=[]
+    for i in range(1,n):
+        if sheet.cell_value(i,4) == bookid:
+            for j in range(i+1,n):
+                for u in range(0,7):
+                    data.append(str(sheet.cell_value(j,u)))
+            os.remove('书籍信息.xls')
+            if not os.path.exists('书籍信息.xls'):
+                book = xlwt.Workbook(encoding='utf-8', style_compression=0)
+                sheet = book.add_sheet('书籍管理系统', cell_overwrite_ok=True)
+                col = ('书名', '作者', '出版社', '出版日期', '书籍编号', '书籍位置', '库存量')
+                for i in range(0, 7):
+                    sheet.write(0, i, col[i])
+                savepath = '书籍信息.xls'
+                book.save(savepath)
+            xls = xlrd.open_workbook('书籍信息.xls')
+            wbook = copy.copy(xls)
+            wsheet = wbook.get_sheet(0)
+            k=0
+            for i in range(1,n-1):
+                for j in range(0,7):
+                    wsheet.write(i,j,data[k])
+                    k=k+1
+            wbook.save('书籍信息.xls')
+            tkinter.messagebox.showinfo('提示', '删除成功！')
+            entry1.delete("0","end")
+            return
+        for k in range(0,7):
+            data.append(str(sheet.cell_value(i,k)))
+    tkinter.messagebox.showerror('错误', '未找到该图书编号的书籍信息！')
+    entry1.delete("0", "end")
+
+
+
+#删除用户
+def deleteuser():
+    delete = Tk()
+    delete .title('删除用户信息')
+    delete .geometry('275x200')
+    text1 = tkinter.Label(delete, bd=4, fg='black', text='删除账号：')
+    text1.place(x=20, y=45)
+    entry = tkinter.Entry(delete, width=20, show='')
+    entry.place(x=100, y=50)
+    button1 = tkinter.Button(delete, text='退出', command=lambda: delete.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(delete, width=8, height=1, command=lambda: getentry5(delete, entry), text='确认');
+    button2.place(x=100, y=100)
+def getentry5(modify,entry):
+    if entry.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入用户账号！')
+        return
+    account=entry.get()
+    path = '用户信息' + '\\' + account + '.xls'
+    if os.path.exists(path):
+        os.remove(path)
+        tkinter.messagebox.showinfo('提示', '删除成功！')
+    else:
+        tkinter.messagebox.showerror('错误', '未找到该图书编号的书籍信息！')
+
+
+#借书
+def borrowbook():
+    #创建用于输入借书相关信息的窗口
+    modify = Tk()
+    modify.title('借书')
+    modify.geometry('275x200')
+    text1 = tkinter.Label(modify, bd=4, fg='black', text='借书账号：')
+    text1.place(x=20, y=45)
+    entry1 = tkinter.Entry(modify, width=20, show='')
+    entry1.place(x=100, y=50)
+    text2 = tkinter.Label(modify, bd=4, fg='black', text='书籍编号：')
+    text2.place(x=20, y=95)
+    entry2 = tkinter.Entry(modify, width=20, show='')
+    entry2.place(x=100, y=100)
+    button1 = tkinter.Button(modify, text='退出', command=lambda: modify.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(modify, width=8, height=1, command=lambda: getbook(entry1,entry2), text='确认');
+    button2.place(x=100, y=150)
+def getbook(entry1,entry2):
+    #判断是否输入借书账号
+    if entry1.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入借书账号！')
+        entry2.delete("0", "end")
+        return
+    #判断是否输入书籍编号
+    if entry2.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入书籍编号！')
+        entry2.delete("0", "end")
+        return
+    account = entry1.get()
+    path = '用户信息' + '\\' + account + '.xls'
+    #判断用户是否存在
+    try:
+        xls1 = xlrd.open_workbook(path)
+        wbook1 = copy.copy(xls1)
+        wsheet1 = wbook1.get_sheet(0)
+        sheet1 = xls1.sheet_by_index(0)
+        table1 = xls1.sheets()[0]
+        #判断用户未还书籍数量，上限为5本，达到上限则不允许借书
+        y=0
+        for p in range (1,table1.nrows):
+            if sheet1.cell_value(p,8)=="否":
+                y=y+1
+        if y>=5:
+            tkinter.messagebox.showerror('错误', '该用户现已借满5本书，请先还书！')
+            entry1.delete("0", "end")
+            entry2.delete("0", "end")
+            return
+    except:
+        tkinter.messagebox.showerror('错误', '用户不存在！')
+        #清空错误的输入信息
+        entry1.delete("0", "end")
+        entry2.delete("0", "end")
+        return
+    bookid=entry2.get()
+    xls = xlrd.open_workbook('书籍信息.xls')
+    wbook=copy.copy(xls)
+    sheet = xls.sheet_by_index(0)
+    wsheet=wbook.get_sheet(0)
+    table = xls.sheets()[0]
+    n = table.nrows
+    # 查找对应书籍编号
+    t=0
+    for i in range(1, n):
+        #判断图书馆是否收录此书
+        if table.cell(i, 4).value == bookid:
+            t=1
+            #判断书籍是否有库存
+            if(int(sheet.cell_value(i,6))>0):
+                for j in range(1, table1.nrows):
+                    #判断是否已借过此书，防止重复借同本书
+                    if sheet1.cell_value(j, 5) == bookid and sheet1.cell_value(j, 8) == "否":
+                        tkinter.messagebox.showerror('错误', '已借过此书且未归还，请先归还再借！')
+                        entry2.delete("0", "end")
+                        return
+                #获取该书籍编号的书名
+                bookname=table.cell(i,0).value
+                #成功借书，库存减1
+                x=int(sheet.cell_value(i,6))-1
+                wsheet.write(i,6,str(x))
+                wbook.save('书籍信息.xls')
+            else:
+                tkinter.messagebox.showerror('错误', '此书已借出，暂无剩余库存！')
+                entry2.delete("0", "end")
+                return
+            break
+    if t==0:
+        tkinter.messagebox.showerror('错误','本馆暂无收录此书！')
+        entry2.delete("0", "end")
+        return
+    data=[]
+    now=datedays.gettomorrow(days=0)
+    data.append(str(now))
+    data.append(str(bookid))
+    data.append(str(bookname))
+    end=datedays.gettomorrow(days=30)
+    data.append(str(end))
+    data.append("否")
+    n=4
+    #从未借过书的情况
+    if sheet1.cell_value(1,4) == "无":
+        for i in range(len(data)):
+            wsheet1.write(1, n, data[i])
+            n=n+1
+    #借过书的情况
+    else:
+        for i in range(len(data)):
+            wsheet1.write(table1.nrows,n,data[i])
+            n=n+1
+    wbook1.save(path)
+    tkinter.messagebox.showinfo('提示', '借书成功！')
+    entry2.delete("0", "end")
+
+
+#还书
+def returnbook():
+    #创建用于输入还书相关信息的窗口
+    modify = Tk()
+    modify.title('还书')
+    modify.geometry('275x200')
+    text1 = tkinter.Label(modify, bd=4, fg='black', text='还书账号：')
+    text1.place(x=20, y=45)
+    entry1 = tkinter.Entry(modify, width=20, show='')
+    entry1.place(x=100, y=50)
+    text2 = tkinter.Label(modify, bd=4, fg='black', text='书籍编号：')
+    text2.place(x=20, y=95)
+    entry2 = tkinter.Entry(modify, width=20, show='')
+    entry2.place(x=100, y=100)
+    button1 = tkinter.Button(modify, text='退出', command=lambda: modify.destroy(), width=4, height=1)
+    button1.place(relx=1, rely=1, anchor='se')
+    button2 = tkinter.Button(modify, width=8, height=1, command=lambda: returnbook2(entry1, entry2), text='确认');
+    button2.place(x=100, y=150)
+def returnbook2(entry1,entry2):
+    #判断还书账号是否输入
+    if entry1.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入还书账号！')
+        entry2.delete("0", "end")
+        return
+    #判断归还书籍的书籍编号是否输入
+    if entry2.get()=="":
+        tkinter.messagebox.showerror('错误', '请输入归还书籍的书籍编号！')
+        entry2.delete("0", "end")
+        return
+    account = entry1.get()
+    path = '用户信息' + '\\' + account + '.xls'
+    #判断用户是否存在
+    try:
+        xls1 = xlrd.open_workbook(path)
+        wbook1 = copy.copy(xls1)
+        wsheet1 = wbook1.get_sheet(0)
+        sheet1 = xls1.sheet_by_index(0)
+        table1 = xls1.sheets()[0]
+    except:
+        tkinter.messagebox.showerror('错误', '用户不存在！')
+        #清空错误信息
+        entry1.delete("0", "end")
+        entry2.delete("0", "end")
+        return
+    bookid=entry2.get()
+    xls = xlrd.open_workbook('书籍信息.xls')
+    wbook=copy.copy(xls)
+    sheet = xls.sheet_by_index(0)
+    wsheet=wbook.get_sheet(0)
+    table = xls.sheets()[0]
+    n = table.nrows
+    t=0
+    d=0
+    #查找是否借过并且尚未归还此书
+    for i in range(1,table1.nrows):
+        if sheet1.cell_value(i,5)==bookid:
+            #成功查找到未还此书的借书信息
+            if sheet1.cell_value(i, 8) == "否":
+                # 查找对应书籍编号，判断图书馆是否收录有此书
+                for j in range(1, n):
+                    if table.cell(j, 4).value == bookid:
+                        d = 1
+                        #成功还书，库存加1，用户借书信息改为已还书
+                        x = int(sheet.cell_value(j, 6)) + 1
+                        wsheet.write(j, 6, str(x))
+                        wbook.save('书籍信息.xls')
+                        wsheet1.write(i, 8, "是")
+                        wbook1.save(path)
+                        break
+                #未在书籍信息表格中找到此书
+                if d == 0:
+                    tkinter.messagebox.showerror('错误', '本馆暂无收录此书！')
+                    entry2.delete("0", "end")
+                    return
+                t=1
+                break
+    #查无符合条件的借书信息
+    if t==0:
+        tkinter.messagebox.showerror('错误', '该用户无此借书信息！')
+        return
+    tkinter.messagebox.showinfo('提示', '还书成功！')
+    entry2.delete("0", "end")
+
+#若不存在名为书籍信息的表格，则创建一个
+if not os.path.exists('书籍信息.xls'):
+    book = xlwt.Workbook(encoding='utf-8', style_compression=0)
+    sheet = book.add_sheet('书籍管理系统', cell_overwrite_ok=True)
+    col = ('书名', '作者', '出版社', '出版日期','书籍编号','书籍位置','库存量')
+    for i in range(0, 7):
+        sheet.write(0, i, col[i])
+    savepath='书籍信息.xls'
+    book.save(savepath)
+#若不存在名为用户信息的文件夹，则创建一个
+path='用户信息'
+if not os.path.exists(path):
+    os.mkdir('用户信息')
+window=createwin()
+window.mainloop() # 运行主窗口，保持窗口打开状态，直到用户关闭窗口。
+