import time
import tkinter as tk
import SystemDesign
 
start = SystemDesign.Manage()
start.read_information()
 
 
# root:主菜单   root2:管理员菜单    root3:管理员登录界面   root4:学生登陆界面
def administrator_menu():
    root.withdraw()
    root2 = tk.Tk()
    root2.title("单项选择题答题与管理系统")
    root2.geometry("900x700")
    root2.config(background='lightblue')
    bt1 = tk.Button(root2, text='1.录入试题信息', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_ad_1(root2))
    bt1.place(x=300, y=20)
    bt2 = tk.Button(root2, text='2.查看学生信息', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_ad_2(root2))
    bt2.place(x=300, y=100)
    bt3 = tk.Button(root2, text='3. 排名学生成绩', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_ad_3(root2))
    bt3.place(x=300, y=180)
    bt4 = tk.Button(root2, text='4.查看试题信息', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_ad_4(root2))
    bt4.place(x=300, y=260)
    bt5 = tk.Button(root2, text='5.分析总体答题情况', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_ad_5(root2))
    bt5.place(x=300, y=340)
    bt6 = tk.Button(root2, text='6.删除试题信息', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_ad_6(root2))
    bt6.place(x=300, y=420)
    bt7 = tk.Button(root2, text='7.删除学生信息', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_ad_7(root2))
    bt7.place(x=300, y=500)
    bt8 = tk.Button(root2, text='8.返回上级', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_ad_8(root2))
    bt8.place(x=300, y=580)
 
 
def func_ad_1(x):  # 管理员功能一
    x.destroy()
    root_func1 = tk.Tk()
    root_func1.title("单项选择题答题与管理系统")
    root_func1.geometry("900x700")
    root_func1.config(background='lightblue')
    func1title = tk.Label(root_func1, text="输入你的试题信息:", font=("Helvetica", 40), background="lightblue")
    func1title.pack()
    func1title.place(x=220, y=80)
 
    func1_lb1 = tk.Label(root_func1, text="题号", font=("Helvetica", 20), background="lightblue")
    func1_lb1.place(x=220, y=160)
    func1_entry1 = tk.Entry(root_func1, width=45)
    func1_entry1.place(x=320, y=170)
 
    func1_lb2 = tk.Label(root_func1, text="题目", font=("Helvetica", 20), background="lightblue")
    func1_lb2.place(x=220, y=200)
    func1_entry2 = tk.Entry(root_func1, width=45)
    func1_entry2.place(x=320, y=210)
 
    func1_lb3 = tk.Label(root_func1, text="选项A", font=("Helvetica", 20), background="lightblue")
    func1_lb3.place(x=210, y=240)
    func1_entry3 = tk.Entry(root_func1, width=45)
    func1_entry3.place(x=320, y=250)
 
    func1_lb4 = tk.Label(root_func1, text="选项B", font=("Helvetica", 20), background="lightblue")
    func1_lb4.place(x=210, y=280)
    func1_entry4 = tk.Entry(root_func1, width=45)
    func1_entry4.place(x=320, y=290)
 
    func1_lb5 = tk.Label(root_func1, text="选项C", font=("Helvetica", 20), background="lightblue")
    func1_lb5.place(x=210, y=320)
    func1_entry5 = tk.Entry(root_func1, width=45)
    func1_entry5.place(x=320, y=330)
 
    func1_lb6 = tk.Label(root_func1, text="选项D", font=("Helvetica", 20), background="lightblue")
    func1_lb6.place(x=210, y=360)
    func1_entry6 = tk.Entry(root_func1, width=45)
    func1_entry6.place(x=320, y=370)
 
    func1_lb7 = tk.Label(root_func1, text="正确答案", font=("Helvetica", 20), background="lightblue")
    func1_lb7.place(x=200, y=400)
    func1_entry7 = tk.Entry(root_func1, width=45)
    func1_entry7.place(x=320, y=410)
 
    func1_bt1 = tk.Button(root_func1, text="确定", font=("Helvetica", 20), background="lightblue",
                          command=lambda: func_ad_1_1(func1_entry1.get(), func1_entry2.get(), func1_entry3.get(),
                                                      func1_entry4.get(), func1_entry5.get(), func1_entry6.get(),
                                                      func1_entry7.get(), root_func1))
    func1_bt1.place(x=460, y=450)
 
    func1_bt2 = tk.Button(root_func1, text="取消", font=("Helvetica", 20), background="lightblue",
                          command=lambda: func_back(root_func1))
    func1_bt2.place(x=560, y=450)

    func1_bt3 = tk.Button(root_func1, text="<- 返回",  font=("Helvetica", 20), background="lightblue",
                          command=lambda: func_back(root_func1))
    func1_bt3.place(x=20, y=10)
 
 
def func_ad_1_1(x1, x2, x3, x4, x5, x6, x7, root_func1):  # 功能一的衍生函数
    root_func1.destroy()
    new_problem = SystemDesign.Problem(num=x1,
                                       question=x2,
                                       choice_a=x3,
                                       choice_b=x4,
                                       choice_c=x5,
 
                                       choice_d=x6,
                                       answer=x7)
    temp = {"题号": new_problem.num, "题目": new_problem.question, "选项A": new_problem.choice_a,
            "选项B": new_problem.choice_b, "选项C": new_problem.choice_c, "选项D": new_problem.choice_d,
            "正确答案": new_problem.answer}
    start.ProblemInfo.append(temp)
    start.save_information()
    message = tk.Tk()
    message.geometry("400x150")
    message.title("单项选择题答题与管理系统")
    message_lb = tk.Label(message, text="添加成功！", font=("等线", 30))
    message_lb.config(fg="red")
    message_lb.pack()
    message_lb.place(x=100, y=20)
    message_bt = tk.Button(message, text="返回", height=1, width=8, command=lambda: func_back(message))
    message_bt.place(x=150, y=95)
 
 
def func_back(x):
    x.destroy()
    administrator_menu()
 
 
def func_ad_2(x):
    x.destroy()
    root_func2 = tk.Tk()
    root_func2.title("单项选择题答题与管理系统")
    root_func2.geometry("800x600")
    bt1 = tk.Button(root_func2, text="返回", width=600, font=("Helvetica", 20), command=lambda: func_back(root_func2))
    bt1.place(x=20,y=10)
    bt1.pack()
    frame_func2 = tk.Frame(root_func2)
    frame_func2.pack()
    scrollbar1 = tk.Scrollbar(frame_func2)
    scrollbar1.pack(side="right", fill="y")
    scrollbar2 = tk.Scrollbar(frame_func2, orient="horizontal")
    scrollbar2.pack(side="bottom", fill="x")
    list_func2 = tk.Listbox(frame_func2, selectmode='browse', width=500, height=20, font=("等线", 30),
                            xscrollcommand=scrollbar2.set, yscrollcommand=scrollbar1.set)
    for stu in start.StudentInfo:
        list_func2.insert("end", stu)
    list_func2.pack()
    scrollbar1.config(command=list_func2.yview)
    scrollbar2.config(command=list_func2.xview)
 
 
def func_ad_3(r):
    r.destroy()
    root_func3 = tk.Tk()
    root_func3.title("单项选择题答题与管理系统")
    root_func3.geometry("800x600")
    bt1 = tk.Button(root_func3, text="返回", width=600, font=("Helvetica", 20), command=lambda: func_back(root_func3))
    bt1.pack()
    frame_func3 = tk.Frame(root_func3)
    frame_func3.pack()
    scrollbar1 = tk.Scrollbar(frame_func3)
    scrollbar1.pack(side="right", fill="y")
    scrollbar2 = tk.Scrollbar(frame_func3, orient="horizontal")
    scrollbar2.pack(side="bottom", fill="x")
    list_func3 = tk.Listbox(frame_func3, selectmode='browse', width=500, height=20, font=("等线", 30),
                            xscrollcommand=scrollbar2.set, yscrollcommand=scrollbar1.set)
    tool = start.StudentInfo
    for del_zero in tool:
        if del_zero["成绩"] == "暂无成绩":
            del_zero["成绩"] = -1
    temp = sorted(tool, key=lambda x: int(x["成绩"]), reverse=True)
    list_stu = []
    for stu in temp:
        if stu["成绩"] == -1:
            stu["成绩"] = "暂无成绩"
        stu_pass = {"用户名": stu["用户名"],
                    "成绩": stu["成绩"],
                    "答题用时": stu["答题时间"]}
        list_stu.append(stu_pass)
    for stu in list_stu:
        list_func3.insert("end", stu)
 
    list_func3.pack()
    scrollbar1.config(command=list_func3.yview)
    scrollbar2.config(command=list_func3.xview)
 
 
def func_ad_4(x):
    x.destroy()
    root_func4 = tk.Tk()
    root_func4.title("单项选择题答题与管理系统")
    root_func4.geometry("800x600")
    bt1 = tk.Button(root_func4, text="返回", width=600, font=("Helvetica", 20), command=lambda: func_back(root_func4))
    bt1.pack()
    frame_func4 = tk.Frame(root_func4)
    frame_func4.pack()
    scrollbar1 = tk.Scrollbar(frame_func4)
    scrollbar1.pack(side="right", fill="y")
    scrollbar2 = tk.Scrollbar(frame_func4, orient="horizontal")
    scrollbar2.pack(side="bottom", fill="x")
    list_func2 = tk.Listbox(frame_func4, selectmode='browse', width=500, height=20, font=("等线", 30),
                            xscrollcommand=scrollbar2.set, yscrollcommand=scrollbar1.set)
    for stu in start.ProblemInfo:
        list_func2.insert("end", stu)
    list_func2.pack()
    scrollbar1.config(command=list_func2.yview)
    scrollbar2.config(command=list_func2.xview)
 
 
def func_ad_5(x):
    x.destroy()
    root_func5 = tk.Tk()
    root_func5.title("单项选择题答题与管理系统")
    root_func5.geometry("800x600")
    root_func5.config(background="lightblue")
    bt1 = tk.Button(root_func5, text="返回", width=600, font=("Helvetica", 20), command=lambda: func_back(root_func5))
    bt1.pack()
    lb1 = tk.Label(root_func5, background="lightblue", text="本次测试有%d道题目" % len(start.ProblemInfo),
                   font=("Helvetica", 40))
    lb1.pack()
    lb2 = tk.Label(root_func5, background="lightblue", text="满分%d分" % (len(start.ProblemInfo) * 5),
                   font=("Helvetica", 40))
    lb2.pack()
    student_num = 0
    total = 0
    for stu in start.StudentInfo:
        if stu["成绩"] == "暂无成绩":
            continue
        total += int(stu["成绩"])
        student_num += 1
    lb3 = tk.Label(root_func5, background="lightblue", text="参与测试%d人" % student_num, font=("Helvetica", 40))
    lb3.pack()
    lb3 = tk.Label(root_func5, background="lightblue", text="平均分：%0.2f" % (total / student_num), font=("Helvetica", 40))
    lb3.pack()
 
 
def func_ad_6(x):
    x.destroy()
    root_func6 = tk.Tk()
    root_func6.geometry("600x300")
    root_func6.title("单项选择题答题与管理系统")
    lb_func6 = tk.Label(root_func6, text="请输入要删除的试题题号!", font=("Helvetica", 20))
    lb_func6.pack()
    entry_func6 = tk.Entry(root_func6)
    entry_func6.place(x=220, y=60)
    bt1 = tk.Button(root_func6, height=1, width=8, text="确认",
                    command=lambda: func_ad_6_1(entry_func6.get()))
    bt1.place(x=220, y=100)
    bt2 = tk.Button(root_func6, height=1, width=8, text="取消", command=lambda: func_back(root_func6))
    bt2.place(x=300, y=100)
 
 
def func_ad_6_1(x):
    index = 0
    for pro in start.ProblemInfo:
        if pro["题号"] == x:
            del start.ProblemInfo[index]
            start.save_information()
            message = tk.Tk()
            message.geometry("400x150")
            message.title("单项选择题答题与管理系统")
            message_lb = tk.Label(message, text="删除成功！", font=("等线", 30))
            message_lb.config(fg="red")
            message_lb.pack()
            message_bt = tk.Button(message, text="返回", height=1, width=8, command=message.destroy)
            message_bt.place(x=150, y=75)
            return
        index += 1
    message = tk.Tk()
    message.geometry("400x150")
    message.title("单项选择题答题与管理系统")
    message_lb = tk.Label(message, text="未找到试题信息", font=("等线", 30))
    message_lb.config(fg="red")
    message_lb.pack()
    message_bt = tk.Button(message, text="返回", height=1, width=8, command=message.destroy)
    message_bt.place(x=150, y=75)
 
 
def func_ad_7(x):
    x.destroy()
    root_func7 = tk.Tk()
    root_func7.geometry("600x300")
    root_func7.title("单项选择题答题与管理系统")
    lb_func7 = tk.Label(root_func7, text="请输入要删除的学生账号!", font=("Helvetica", 20))
    lb_func7.pack()
    entry_func7 = tk.Entry(root_func7)
    entry_func7.place(x=220, y=60)
    bt1 = tk.Button(root_func7, height=1, width=8, text="确认",
                    command=lambda: func_ad_7_1(entry_func7.get()))
    bt1.place(x=220, y=100)
    bt2 = tk.Button(root_func7, height=1, width=8, text="取消", command=lambda: func_back(root_func7))
    bt2.place(x=300, y=100)
 
 
def func_ad_7_1(x):
    index = 0
    for pro in start.StudentInfo:
        if pro["账号"] == x:
            del start.StudentInfo[index]
            start.save_information()
            message = tk.Tk()
            message.geometry("400x150")
            message.title("单项选择题答题与管理系统")
            message_lb = tk.Label(message, text="删除成功！", font=("等线", 30))
            message_lb.config(fg="red")
            message_lb.pack()
            message_bt = tk.Button(message, text="返回", height=1, width=8, command=message.destroy)
            message_bt.place(x=150, y=75)
            return
        index += 1
    message = tk.Tk()
    message.geometry("400x150")
    message.title("单项选择题答题与管理系统")
    message_lb = tk.Label(message, text="未找到学生信息", font=("等线", 30))
    message_lb.config(fg="red")
    message_lb.pack()
    message_bt = tk.Button(message, text="返回", height=1, width=8, command=message.destroy)
    message_bt.place(x=150, y=75)
 
 
def func_ad_8(x):
    x.destroy()
    root.deiconify()
 
 
def student_menu(x):
    index = 0
    global grade
    grade = 0
    start_time = time.time()
    root.withdraw()
    root_stu = tk.Tk()
    root_stu.title("单项选择题答题与管理系统")
    root_stu.geometry("900x700")
    root_stu.config(background='lightblue')
    lb1 = tk.Label(root_stu, text="欢迎你%s同学" % x, font=("Helvetica", 40), background='lightblue')
    lb1.pack()
    bt1 = tk.Button(root_stu, text='1.开始答题', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_stu_1(root_stu, x, index, start_time))
    bt1.place(x=320, y=240)
    bt2 = tk.Button(root_stu, text='2.返回上级', font=("Helvetica", 30), background='lightblue',
                    command=lambda: func_stu_2(root_stu))
    bt2.place(x=320, y=360)
 
 
def func_stu_1(win, name, index_pro, start_time):
    win.destroy()
    root_func1 = tk.Tk()
    root_func1.title("单项选择题答题与管理系统")
    root_func1.geometry("900x700")
    root_func1.config(background='lightblue')
    func1title = tk.Label(root_func1, text="做下一题前请先提交当前题目！", font=("Helvetica", 40), background="lightblue")
    func1title.pack()
 
    temp = start.ProblemInfo[index_pro]
 
    pro_num = tk.Label(root_func1, text="%s." % temp["题号"], font=("Helvetica", 30), background="lightblue", )
    pro_num.place(x=200, y=80)
 
    pro_question = tk.Label(root_func1, text="%s" % temp["题目"], font=("Helvetica", 30), background="lightblue")
    pro_question.place(x=260, y=80)
 
    pro_a = tk.Label(root_func1, text="A.%s" % temp["选项A"], font=("Helvetica", 30), background="lightblue")
    pro_a.place(x=220, y=160)
 
    pro_b = tk.Label(root_func1, text="B.%s" % temp["选项B"], font=("Helvetica", 30), background="lightblue")
    pro_b.place(x=220, y=240)
 
    pro_c = tk.Label(root_func1, text="C.%s" % temp["选项C"], font=("Helvetica", 30), background="lightblue")
    pro_c.place(x=220, y=320)
 
    pro_d = tk.Label(root_func1, text="D.%s" % temp["选项D"], font=("Helvetica", 30), background="lightblue")
    pro_d.place(x=220, y=400)
 
    pro_answer = tk.Label(root_func1, text="你的选项为", font=("Helvetica", 30), background="lightblue")
    pro_answer.place(x=220, y=480)
    answer_get = tk.Entry(root_func1, font=("Helvetica", 30), width=2)
    answer_get.place(x=450, y=480)
 
    bt_ensure = tk.Button(root_func1, text="提 交", command=lambda: check_answer(answer_get.get(), temp["正确答案"]),
                          font=("Helvetica", 30), background="lightblue")
    bt_ensure.place(x=220, y=560)
 
    if index_pro == len(start.ProblemInfo) - 1:  # 目前只能下一题，且无法返回更改
        for stu in start.StudentInfo:
            if stu["用户名"] == name:
                stu["成绩"] = str(grade)
                stu["答题时间"] = str(int(time.time() - start_time))
                start.save_information()
        bt_end = tk.Button(root_func1, text="结束考试", command=lambda: func_stu_1_1(root_func1),
                           font=("Helvetica", 30), background="lightblue")
        bt_end.place(x=480, y=560)
 
    else:
        bt_down = tk.Button(root_func1, text="下一题",
                            command=lambda: func_stu_1(root_func1, name, index_pro + 1, start_time),
                            font=("Helvetica", 30),
                            background="lightblue")
        bt_down.place(x=480, y=560)
 
 
def check_answer(x, y):
    global grade
    if x == y:
        grade += 5
 
 
def func_stu_1_1(x):
    x.destroy()
    message = tk.Tk()
    message.geometry("400x150")
    message.title("单项选择题答题与管理系统")
    message_lb = tk.Label(message, text="答题结束！", font=("等线", 30))
    message_lb.config(fg="red")
    message_lb.pack()
    message_bt = tk.Button(message, text="返回", height=1, width=8, command=lambda: func_stu_2(message))
    message_bt.place(x=150, y=75)
 
 
def func_stu_1_2(x):
    x.destroy()
    root.deiconify()
 
 
def func_stu_2(x):
    x.destroy()
    root.deiconify()
 
 
def check_psw(x, y):
    if x == "123456":
        y.destroy()
        administrator_menu()
    else:
        message = tk.Tk()
        message.geometry("300x150")
        message.title("单项选择题答题与管理系统")
        message_lb = tk.Label(message, text="密码错误！", font=("等线", 30))
        message_lb.config(fg="red")
        message_lb.pack()
        message_bt = tk.Button(message, text="返回", height=1, width=8, command=message.destroy)
        message_bt.place(x=120, y=75)
 
 
def administrator_login():
    root3 = tk.Tk()
    root3.geometry("600x300")
    root3.title("单项选择题答题与管理系统")
    ad_login = tk.Label(root3, text="请输入管理员密码!", font=("Helvetica", 20))
    ad_login.pack()
    ad_login_entry = tk.Entry(root3, show="*")
    ad_login_entry.place(x=220, y=60)
    ad_login_bt1 = tk.Button(root3, height=1, width=8, text="确认",
                             command=lambda: check_psw(ad_login_entry.get(), root3))
    ad_login_bt1.place(x=220, y=100)
    ad_login_bt2 = tk.Button(root3, height=1, width=8, text="取消", command=root3.destroy)
    ad_login_bt2.place(x=300, y=100)
 
 
def student_login():
    root4 = tk.Tk()
    root4.geometry("600x300")
    root4.title("单项选择题答题与管理系统")
    st_login = tk.Label(root4, text="请输入账号和密码!", font=("Helvetica", 20))
    st_login.pack()
    st_lb1 = tk.Label(root4, text="账号", font=6)
    st_lb1.place(x=200, y=60)
    st_login_entry1 = tk.Entry(root4)
    st_login_entry1.place(x=250, y=60)
    st_lb2 = tk.Label(root4, text="密码", font=6)
    st_lb2.place(x=200, y=100)
    st_login_entry2 = tk.Entry(root4)
    st_login_entry2.place(x=250, y=100)
    st_login_bt1 = tk.Button(root4, height=1, width=8, text="确认",
                             command=lambda: student_check(st_login_entry1.get(), st_login_entry2.get(), root4))
    st_login_bt1.place(x=240, y=130)
    st_login_bt2 = tk.Button(root4, height=1, width=8, text="取消", command=root4.destroy)
    st_login_bt2.place(x=320, y=130)
    '''
    bt2 = tk.Button(root, text='1.开始答题', font=("Helvetica", 30), background='lightblue')
    bt2.place(x=300, y=180)
    bt3 = tk.Button(root, text='2.返回上级', font=("Helvetica", 30), background='lightblue')
    bt3.place(x=300, y=260)
    '''
 
 
def student_check(x, y, z):  # 检查学生的登录信息
    for stu in start.StudentInfo:
        if x == stu["账号"] and y == stu["密码"]:
            z.destroy()
            student_menu(stu["用户名"])
            break
    else:
        message = tk.Tk()
        message.geometry("400x150")
        message.title("单项选择题答题与管理系统")
        message_lb = tk.Label(message, text="账号或密码错误！", font=("等线", 30))
        message_lb.config(fg="red")
        message_lb.pack()
        message_bt = tk.Button(message, text="返回", height=1, width=8, command=message.destroy)
        message_bt.place(x=150, y=75)
 
 
def student_register():  # 注册学生信息页面
    root5 = tk.Tk()
    root5.geometry("600x300")
    root5.title("单项选择题答题与管理系统")
    st_login = tk.Label(root5, text="填写你的注册信息", font=("Helvetica", 20))
    st_login.pack()
 
    st_lb1 = tk.Label(root5, text="用户名", font=6)
    st_lb1.place(x=185, y=60)
    st_login_entry1 = tk.Entry(root5)
    st_login_entry1.place(x=250, y=60)
 
    st_lb2 = tk.Label(root5, text="账号", font=6)
    st_lb2.place(x=200, y=100)
    st_login_entry2 = tk.Entry(root5)
    st_login_entry2.place(x=250, y=100)
 
    st_lb2 = tk.Label(root5, text="密码", font=6)
    st_lb2.place(x=200, y=140)
    st_login_entry3 = tk.Entry(root5)
    st_login_entry3.place(x=250, y=140)
 
    st_login_bt1 = tk.Button(root5, height=1, width=8, text="确认",
                             command=lambda: add_student(st_login_entry1.get(), st_login_entry2.get(),
                                                         st_login_entry3.get(), root5))
    st_login_bt1.place(x=240, y=180)
    st_login_bt2 = tk.Button(root5, height=1, width=8, text="取消", command=root5.destroy)
    st_login_bt2.place(x=320, y=180)
 
 
def add_student(x, y, z, root5):  # 注册成功后的消息弹窗页面
    root5.destroy()
    new_student = SystemDesign.Student(name=x,
                                       user_name=y,
                                       user_password=z,
                                       grade="暂无成绩",
                                       usetime="暂无信息")
    temp = {"用户名": new_student.name, "账号": new_student.user_name, "密码": new_student.user_password,
            "成绩": new_student.grade, "答题时间": new_student.usetime}
    # 这里的new_student不能直接传入列表，要放在一个字典里把数据”打包“过去
    start.StudentInfo.append(temp)
    start.save_information()
    message = tk.Tk()
    message.geometry("400x150")
    message.title("单项选择题答题与管理系统")
    message_lb = tk.Label(message, text="添加成功！", font=("等线", 30))
    message_lb.config(fg="red")
    message_lb.pack()
    message_bt = tk.Button(message, text="返回", height=1, width=8, command=message.destroy)
    message_bt.place(x=150, y=75)
 
 
root = tk.Tk()
root.title("单项选择题答题与管理系统")
root.geometry("900x600")
root.config(background='lightblue')
main_label1 = tk.Label(root, text='单项选择题答题与管理系统', font=("Helvetica", 40), background='lightblue')
main_label1.pack()
main_bt1 = tk.Button(root, text='1.管理员登录', font=("Helvetica", 30), background='lightblue', command=administrator_login)
main_bt1.place(x=300, y=100)
main_bt2 = tk.Button(root, text='2.学生端登录', font=("Helvetica", 30), background='lightblue', command=student_login)
main_bt2.place(x=300, y=180)
main_bt3 = tk.Button(root, text='3. 注册学生账户', font=("Helvetica", 30), background='lightblue', command=student_register)
main_bt3.place(x=300, y=260)
main_bt4 = tk.Button(root, text='4.退出系统', font=("Helvetica", 30), background='lightblue', command=exit)
main_bt4.place(x=300, y=340)
global grade
root.mainloop()