Quelty

def insert_text(event):
    file_name = fd.askopenfilename()
    if file_name:
        with open(file_name) as f:
            s = f.read()
            text.insert(1.0, s)


def extract_text(event):
    file_name = fd.asksaveasfilename(filetypes=(('mmm files', '*.mmm',),))
    if file_name:
        with open(file_name, 'w') as f:
            s = text.get(1.0, tk.END)
            f.write(s)


if __name__ == '__main__':
    root = tk.Tk()

    root.title('test')
    root.state('zoomed')

    root.bind('<Control-o>', insert_text)
    root.bind('<Control-s>', extract_text)

    text = tk.Text(width=50, height=25)
    text.grid(columnspan=2)

    root.mainloop()