button.py

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

class Application(Gtk.Window):
	
	def __init__(self):
	
		Gtk.Window.__init__(self, title="Application")
		self.set_default_size(50, 200)
		
		grid = Gtk.Grid()
		self.add(grid)
		
		pixbuf = GdkPixbuf.Pixbuf.new_from_file_at_scale("s.png", 50, 35, 1)
		
		image = Gtk.Image()
		image.set_from_pixbuf(pixbuf)
	
		button = Gtk.Button(image=image)
		grid.attach(button, 1, 1, 1, 1)
		
app = Application()
app.connect("delete-event", Gtk.main_quit)
app.show_all()
Gtk.main()