python tkinter之顶层菜单、弹出菜单

from tkinter import *

def sys_callbak():
      pass

def fun_callbak():
      pass

def no_thing(event):
      popmenu.post(event.x_root,event.y_root)

master = Tk()
master.title('新闻自动抓取')

menubar = Menu(master)
sysmenu = Menu(menubar,tearoff=False)
sysmenu.add_command(label='添加',command=sys_callbak)
sysmenu.add_command(label='修改',command=sys_callbak)
sysmenu.add_separator()
sysmenu.add_command(label='退出',command=sys_callbak)
menubar.add_cascade(label='系统',menu=sysmenu)

funmenu = Menu(menubar)
funmenu.add_command(label='添加',command=fun_callbak)
funmenu.add_command(label='修改',command=fun_callbak)
menubar.add_cascade(label='功能',menu=funmenu)

popmenu = Menu(master)
popmenu.add_command(label='未设置',command=no_thing)
popmenu.add_command(label='想的美',command=no_thing)
frame = Frame(master,width=312,height=512)
frame.bind('',no_thing)

frame.grid()
master.grid()

master.config(menu=menubar)

mainloop()