We bind the right-click event to the show_popup handler for the text instance, which displays the menu with its top-left corner over the clicked position. Each time this event is triggered, the same menu instance is displayed again:

def show_popup(self, event):
    self.menu.post(event.x_root, event.y_root)

The following methods are available for all widget classes to interact with the clipboard:

• clipboard_clear(): Clears the data from the clipboard
• clipboard_append(string): Appends a string to the clipboard
• clipboard_get(): Returns the data from the clipboard

The callback method for the copy action gets the current selection and adds it to the clipboard:

    def copy_text(self):
        selection = self.text.tag_ranges(tk.SEL)
        if selection:
            self.clipboard_clear()
            self.clipboard_append(self.text.get(*selection))

The paste action inserts the clipboard contents into the insertion cursor position, defined by the INSERT index. We have to wrap this in a try...except block, since calling clipboard_get raises a TclError if the clipboard is empty:

    def paste_text(self):
        try:
            self.text.insert(tk.INSERT, self.clipboard_get())
        except tk.TclError:
            pass

The delete action does not interact with the clipboard, but removes the contents of the current selection:

    def delete_text(self):
        selection = self.text.tag_ranges(tk.SEL)
        if selection:
            self.text.delete(*selection)

Since the cut action is a combination of copy and delete, we reused these methods to compose its callback function.