4.Functionalities_Code.py

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


def __showAbout():
    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 is 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>>")