pygtk_foobar.py

#!/usr/bin/env python

from gi.repository import Gtk
import sys



class GUI:
	def __init__(self):

		window = Gtk.Window()
		window.set_title ("Hello World")
		window.connect_after('destroy', self.on_window_destroy)

		self.liststore = Gtk.ListStore(str,str,float)

		box = Gtk.Box(spacing=6)

		self.treeview = Gtk.TreeView(self.liststore)
		
		box.pack_start(self.treeview, True, True, 0)
		
		window.add(box)

		renderer = Gtk.CellRendererText()
		
		column = Gtk.TreeViewColumn('Name',renderer,text=0)
		column2 = Gtk.TreeViewColumn('Name2',renderer,text=1)
		column3 = Gtk.TreeViewColumn('Name3',renderer,text=2)
		self.treeview.append_column(column)
		self.treeview.append_column(column2)
		self.treeview.append_column(column3)

		
		iterator = self.liststore.append()
		self.liststore.set(iterator,(0,1,2),('first','second',2.2))
		
		window.show_all()

	def on_window_destroy(self, window):
		Gtk.main_quit()

def main():
	app = GUI()
	Gtk.main()
		
if __name__ == "__main__":
	sys.exit(main())

Bug:
column = Gtk.TreeViewColumn('Name',renderer,text=0)
column2 = Gtk.TreeViewColumn('Name2',renderer,text=1)
column3 = Gtk.TreeViewColumn('Name3',renderer,text=2)