Python的简易记事本的编程，没有菜单栏，哪位大神看看啊！！！

更新时间2021-02-09 15:48:19

from tkinter.filedialog import *
from tkinter.colorchooser import *
class Application(Frame):
   def __init(self,master=None):
   super().__init__(master)
self.master=master
   self.textpad=None
self.pack()
   self.createWidget()
   def createWidget(self):
menubar=Menu(root)
menuFile=Menu(menubar)
   menuEdit=Menu(menubar)
   menuHelp=Menu(menubar)
menubar.add_cascade(label="文件（F)",menu=menuFile)
   menubar.add_cascade(label="编辑（E)",menu=menuEdit)
   menubar.add_cascade(label="帮助（H)",menu=menuHelp
menuFile.add_command(label="新建",accelerator="ctrl+n",command=self.aaa)
   menuFile.add_command(label="打开",accelerator="ctrl+o",command=self.aaa)
   menuFile.add_command(label="保存",accelerator="ctrl+s",command=self.aaa)
   menuFile.add_separator()
menuFile.add_command(label="退出",accelerator="ctrl+q",command=self.aaa)
root["menu"]=menubar
self.textpad=Text(root,width=50,height=30)
   self.textpad.pack()
self.contextMenu=Menu(root)
   self.contextMenu.add_command(label="背景颜色",command=self.aaa)
root.bind("<Button-3>",self.createContextMenu)
   def test(self):
   pass
   def createContextMenu(self,event):
   self.contextMenu.post(event.x_root,event.y_root)
if __name__=='__main__':
   root=Tk()
   root.geometry("450x300+200+300")
   root.title("简易记事本")
   app=Application(master=root)
   root.mainloop()