initial example, not working, "draw" invalid signal

example.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env pythonw
+
+import os
+import sys
+import gtk
+import pango
+import pangocairo
+
+FONT = "Sans Bold 27"
+
+class MyWidget(gtk.DrawingArea):
+    def __init__(self):
+        gtk.DrawingArea.__init__(self)
+        self.set_size_request(200, 200)
+
+    def do_draw_cb(self, widget, cr):
+        layout = pangocairo.create_layout(cr)
+        layout.set_text("Text", -1)
+        desc = pango.font_description_from_string(FONT)
+        layout.set_font_description(desc)
+        pangocairo.show_layout(cr, layout)
+
+def destroy(window):
+    gtk.main_quit()
+
+def main():
+    window = gtk.Window()
+    window.set_title("Custom pygtk widget hello world")
+    widget = MyWidget()
+    window.add(widget)
+    widget.connect('draw', widget.do_draw_cb)
+    window.connect_after('destroy', destroy)
+    window.show_all()
+    gtk.main()
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main())