Right to Left in Python GTK+ 3

Is there a way to change direction of Gtk.Window in sample code below and make it Right to Left? i tried to change it with gravity but didn't worked.

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk

class MainWindow(Gtk.Window):

    def __init__(self):

        Gtk.Window.__init__(self, title="DEMO")
        self.set_position(Gtk.WindowPosition.CENTER)
        self.set_gravity(Gdk.Gravity.NORTH_EAST)

        grid = Gtk.Grid()
        self.add(grid)

        button1 = Gtk.Button(label="Button 1")
        button2 = Gtk.Button(label="Button 2")
        button3 = Gtk.Button(label="Button 3")
        button4 = Gtk.Button(label="Button 4")
        button5 = Gtk.Button(label="Button 5")
        button6 = Gtk.Button(label="Button 6")

        grid.add(button1)
        grid.attach(button2, 1, 0, 2, 1)
        grid.attach_next_to(button3, button1, Gtk.PositionType.BOTTOM, 1, 2)
        grid.attach_next_to(button4, button3, Gtk.PositionType.RIGHT, 2, 1)
        grid.attach(button5, 1, 2, 1, 1)
        grid.attach_next_to(button6, button5, Gtk.PositionType.RIGHT, 1, 1)

win = MainWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

Solution

Try this:

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk

class MainWindow(Gtk.Window):

    def __init__(self):

        Gtk.Window.__init__(self, title="DEMO")
        self.set_position(Gtk.WindowPosition.CENTER)
        self.set_gravity(Gdk.Gravity.NORTH_EAST)
        self.set_direction(Gtk.TextDirection.RTL)
        grid = Gtk.Grid()
        grid.set_halign(Gtk.Align.END)
        grid.set_direction(Gtk.TextDirection.RTL)
        self.add(grid)
        button1 = Gtk.Label(label="Button 1")
        button1.set_halign(Gtk.Align.START)
        button1.set_direction(Gtk.TextDirection.RTL)
        button2 = Gtk.Button(label="Button 2")
        button3 = Gtk.Button(label="Button 3")
        button4 = Gtk.Button(label="Button 4")
        button5 = Gtk.Button(label="Button 5")
        button6 = Gtk.Button(label="Button 6")

        grid.add(button1)
        grid.attach(button2, 1, 0, 2, 1)
        grid.attach_next_to(button3, button1, Gtk.PositionType.BOTTOM, 1, 2)
        grid.attach_next_to(button4, button3, Gtk.PositionType.RIGHT, 2, 1)
        grid.attach(button5, 1, 2, 1, 1)
        grid.attach_next_to(button6, button5, Gtk.PositionType.RIGHT, 1, 1)

win = MainWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

By the way, you can easily figure stuff like this out by using Glade to create a mockup.

Edit: according to this answer, you would change the direction. It didn't work for me, but maybe my language settings have something to do with it.