问tkinter记事本程序试图使右击复制粘贴选项真的很新，这不能让它工作

EN

import tkinter 
import os     
from tkinter import *
from tkinter.messagebox import *
from tkinter.filedialog import *

class Notepad: 
    __root = Tk()

# default window width and height 
__thisWidth = 300
__thisHeight = 300
__thisTextArea = Text(__root) 
__thisMenuBar = Menu(__root) 
__thisFileMenu = Menu(__thisMenuBar, tearoff=0) 
__thisEditMenu = Menu(__thisMenuBar, tearoff=0) 
__thisHelpMenu = Menu(__thisMenuBar, tearoff=0) 

# To add scrollbar 
__thisScrollBar = Scrollbar(__thisTextArea)      
__file = None

def __init__(self,**kwargs): 

    # Set icon 
    try: 
            self.__root.wm_iconbitmap("Notepad.ico")  
    except: 
            pass

    # Set window size (the default is 300x300) 

    try: 
        self.__thisWidth = kwargs['width'] 
    except KeyError: 
        pass

    try: 
        self.__thisHeight = kwargs['height'] 
    except KeyError: 
        pass

    # Set the window text 
    self.__root.title("Untitled - Notepad") 

    # Center the window 
    screenWidth = self.__root.winfo_screenwidth() 
    screenHeight = self.__root.winfo_screenheight() 

    # For left-align 
    left = (screenWidth / 2) - (self.__thisWidth / 2)  

    # For right-align 
    top = (screenHeight / 2) - (self.__thisHeight /2)  

    # For top and bottom 
    self.__root.geometry('%dx%d+%d+%d' % (self.__thisWidth, 
                                          self.__thisHeight, 
                                          left, top))  

    # To make the textarea auto resizable 
    self.__root.grid_rowconfigure(0, weight=1) 
    self.__root.grid_columnconfigure(0, weight=1) 

    # Add controls (widget) 
    self.__thisTextArea.grid(sticky = N + E + S + W) 

    # To open new file 
    self.__thisFileMenu.add_command(label="New", 
                                    command=self.__newFile)     

    # To open a already existing file 
    self.__thisFileMenu.add_command(label="Open", 
                                    command=self.__openFile) 

    # To save current file 
    self.__thisFileMenu.add_command(label="Save", 
                                    command=self.__saveFile)     

    # To create a line in the dialog         
    self.__thisFileMenu.add_separator()                                          
    self.__thisFileMenu.add_command(label="Exit", 
                                    command=self.__quitApplication) 
    self.__thisMenuBar.add_cascade(label="File", 
                                   menu=self.__thisFileMenu)      

    # To give a feature of cut  
    self.__thisEditMenu.add_command(label="Cut", 
                                    command=self.__cut)              

    # to give a feature of copy     
    self.__thisEditMenu.add_command(label="Copy", 
                                    command=self.__copy)          

    # To give a feature of paste 
    self.__thisEditMenu.add_command(label="Paste", 
                                    command=self.__paste)          

    # To give a feature of editing 
    self.__thisMenuBar.add_cascade(label="Edit", 
                                   menu=self.__thisEditMenu)      

    # To create a feature of description of the notepad 
    self.__thisHelpMenu.add_command(label="About Notepad", 
                                    command=self.__showAbout)  
    self.__thisMenuBar.add_cascade(label="Help", 
                                   menu=self.__thisHelpMenu) 

    self.__root.config(menu=self.__thisMenuBar) 

    self.__thisScrollBar.pack(side=RIGHT,fill=Y)                     

    # Scrollbar will adjust automatically according to the content         
    self.__thisScrollBar.config(command=self.__thisTextArea.yview)      
    self.__thisTextArea.config(yscrollcommand=self.__thisScrollBar.set) 


def __quitApplication(self): 
    self.__root.destroy() 
    # exit() 

def __showAbout(self): 
    showinfo("Notepad","Mrinal Verma") 

def __openFile(self): 

    self.__file = askopenfilename(defaultextension=".txt", 
                                  filetypes=[("All Files","*.*"), 
                                    ("Text Documents","*.txt")]) 

    if self.__file == "": 

        # no file to open 
        self.__file = None
    else: 

        # Try to open the file 
        # set the window title 
        self.__root.title(os.path.basename(self.__file) + " - Notepad") 
        self.__thisTextArea.delete(1.0,END) 

        file = open(self.__file,"r") 

        self.__thisTextArea.insert(1.0,file.read()) 

        file.close() 







def __newFile(self): 
    self.__root.title("Untitled - Notepad") 
    self.__file = None
    self.__thisTextArea.delete(1.0,END) 

def __saveFile(self): 

    if self.__file == None: 
        # Save as new file 
        self.__file = asksaveasfilename(initialfile='Untitled.txt', 
                                        defaultextension=".txt", 
                                        filetypes=[("All Files","*.*"), 
                                            ("Text Documents","*.txt")]) 

        if self.__file == "": 
            self.__file = None
        else: 

            # Try to save the file 
            file = open(self.__file,"w") 
            file.write(self.__thisTextArea.get(1.0,END)) 
            file.close() 

            # Change the window title 
            self.__root.title(os.path.basename(self.__file) + " - Notepad") 


    else: 
        file = open(self.__file,"w") 
        file.write(self.__thisTextArea.get(1.0,END)) 
        file.close() 

def __cut(self): 
    self.__thisTextArea.event_generate("<<Cut>>") 

def __copy(self): 
    self.__thisTextArea.event_generate("<<Copy>>") 

def __paste(self): 
    self.__thisTextArea.event_generate("<<Paste>>") 

def run(self): 

    # Run main application 
    self.__root.mainloop() 







# Run main application 
notepad = Notepad(width=600,height=400) 
notepad.run() 

w = Label(root, text="Right-click to display menu", width=40, height=20)
w.pack()

# create a menu
popup = Menu(root, tearoff=0)
popup.add_command(label="Next") # , command=next) etc...
popup.add_command(label="Previous")
popup.add_separator()
popup.add_command(label="Home")

def do_popup(event):
# display the popup menu
try:
    popup.tk_popup(event.x_root, event.y_root, 0)
finally:
    # make sure to release the grab (Tk 8.0a1 only)
    popup.grab_release()

w.bind("<Button-3>", do_popup)

b = Button(root, text="Quit", command=root.destroy)
 b.pack()