问phtnon中利用tkinter完成一个猜字游戏，遇到了以下问题？

import random
from tkinter import *
from tkinter import messagebox, Button

win = Tk()
win.title('猜数字游戏')
win.geometry('300x200')
l = Label(win, text='来玩猜字谜游戏吧', bg='red',
          fg='black', height=2, width=20, font=('Arial', 12))
l.place(x=55, y=35)
b = Button(win, text="开始", font=('Arial', 12), width=10, height=1, command=win.quit)
b.place(x=100, y=100)
win.mainloop()
win.destroy()

win = Tk()
number = random.randint(0, 100)
n = 0
win.title('猜数字游戏')
win.geometry('300x200')
l = Label(win, text='请输入你猜的数字', height=2, width=20, font=('Arial', 12))
l.place(x=55, y=25)
l = Label(win, text='游戏规则:在1-100之间猜出正确数字', height=2, width=30, font=('Arial', 10))
l.place(x=30, y=150)
e1 = Entry(win, width=20, )
e1.place(x=75, y=70)


def guess(self):
    global n
    t = self.entry.get()
    if int(t) == 0:
        messagebox.showinfo('提示', '请输入一个小于等于100的数')
    try:
        num = int(t)
    except ValueError:
        messagebox.showinfo('错误', '请输入一个小于等于100的数')
        return self

    if num > number:
        n += 1
        messagebox.showinfo('提示', '猜的数字大了,再小点！')
        entry.delete(0, END)
        return
    if num < number:
        n += 1
        messagebox.showinfo('提示', '猜的数字小了，再大点！')
        entry.delete(0, END)
        return
    if num == number:
        messagebox.showinfo('提示', '恭喜你猜中了！！！，共猜测了{}次'.format(n))
        return


b= Button(win, text='确认', width=8, height=1, font=('Arial', 12), command=guess)
b.place(x=105, y=110)

win.mainloop()