#!/usr/bin/env python# example treemodelsort.pyimport pygtkpygtk.require('2.0')import gtkimport randomclass TreeModelSortExample:    # close the window and quit    def delete_event(self, widget, event, data=None):        gtk.main_quit()        return False    def add_row(self, b):        rand = self.rand        # add a row of random ints        i0 = self.w[0].sm.get_model().append([rand.randint(0, 1000),                                              rand.randint(0, 1000000),                                              rand.randint(-10000, 10000)])        # select the new row in each view        for n in range(3):            sel = self.w[n].tv.get_selection()            i1 = self.w[n].sm.convert_child_iter_to_iter(None, i0)            sel.select_iter(i1)    def __init__(self):        # create a liststore with three int columns        self.liststore = gtk.ListStore(int, int, int)        # create a random number generator        self.rand = random.Random()        # Create new windows        self.w = [None] * 3                for n in range(3):            self.w[n] = gtk.Window(gtk.WINDOW_TOPLEVEL)            win = self.w[n]            win.set_title("TreeModelSort Example %i" % n)            win.set_size_request(220, 200)            win.connect("delete_event", self.delete_event)            win.vbox = gtk.VBox()            win.add(win.vbox)            win.sw = gtk.ScrolledWindow()            win.sm = gtk.TreeModelSort(self.liststore)            # Set sort column            win.sm.set_sort_column_id(n, gtk.SORT_ASCENDING)            win.tv = gtk.TreeView(win.sm)            win.vbox.pack_start(win.sw)            win.b = gtk.Button('Add a Row')            win.b.connect('clicked', self.add_row)            win.vbox.pack_start(win.b, False)            win.sw.add(win.tv)            win.tv.column = [None]*3            win.tv.column[0] = gtk.TreeViewColumn('0-1000')            win.tv.column[1] = gtk.TreeViewColumn('0-1000000')            win.tv.column[2] = gtk.TreeViewColumn('-10000-10000')            win.tv.cell = [None]*3            for i in range(3):                win.tv.cell[i] = gtk.CellRendererText()                win.tv.append_column(win.tv.column[i])                win.tv.column[i].set_sort_column_id(i)                win.tv.column[i].pack_start(win.tv.cell[i], True)                win.tv.column[i].set_attributes(win.tv.cell[i], text=i)            win.show_all()def main():    gtk.main()if __name__ == "__main__":    tmsexample = TreeModelSortExample()    main()