#!/usr/bin/env python
from gi.repository import Gtk
import cairo
class MyWindow (Gtk.Window):
    
    def __init__(self):
        Gtk.Window.__init__(self, title='MyWindow')
        
        darea = Gtk.DrawingArea()
        darea.connect('draw', self.on_draw)
        self.add(darea)
    
    def on_draw(self, widget, ctx):
        ctx.set_source_rgb(0, 0, 0)
        ctx.select_font_face("Sans", cairo.FONT_SLANT_NORMAL,
            cairo.FONT_WEIGHT_NORMAL)
        ctx.set_font_size(20)
        ctx.move_to(10, 20)
        ctx.show_text("Text...")
win = MyWindow()
win.connect('delete-event', Gtk.main_quit)
win.show_all()
Gtk.main()