#!/usr/bin/env python# example fixed.pyimport pygtkpygtk.require('2.0')import gtkclass FixedExample:    # This callback method moves the button to a new position    # in the Fixed container.    def move_button(self, widget):        self.x = (self.x+30)%300        self.y = (self.y+50)%300        self.fixed.move(widget, self.x, self.y)     def __init__(self):        self.x = 50        self.y = 50        # Create a new window        window = gtk.Window(gtk.WINDOW_TOPLEVEL)        window.set_title("Fixed Container")        # Here we connect the "destroy" event to a signal handler         window.connect("destroy", lambda w: gtk.main_quit())         # Sets the border width of the window.        window.set_border_width(10)        # Create a Fixed Container        self.fixed = gtk.Fixed()        window.add(self.fixed)        self.fixed.show()          for i in range(1, 4):            # Creates a new button with the label "Press me"            button = gtk.Button("Press me")              # When the button receives the "clicked" signal, it will call the            # method move_button().            button.connect("clicked", self.move_button)              # This packs the button into the fixed containers window.            self.fixed.put(button, i*50, i*50)              # The final step is to display this newly created widget.            button.show()        # Display the window        window.show()def main():    # Enter the event loop    gtk.main()    return 0if __name__ == "__main__":    FixedExample()    main()