def change_keyboard_mapping(self, first_keycode, keysyms, onerror = None):
        """Modify the keyboard mapping, starting with first_keycode.
        keysyms is a list of tuples of keysyms. keysyms[n][i] will be
        assigned to keycode first_keycode+n at index i."""
        request.ChangeKeyboardMapping(display = self.display,
                                      onerror = onerror,
                                      first_keycode = first_keycode,
                                      keysyms = keysyms)
Modify the keyboard mapping, starting with first_keycode.
        keysyms is a list of tuples of keysyms. keysyms[n][i] will be
        assigned to keycode first_keycode+n at index i.