import gi
gi.require_version("Gtk","3.0")
from gi.repository import Gtk
win = Gtk.Window(title="testcase")
store = Gtk.ListStore(str, str)

tree = Gtk.TreeView(store)
render_text = Gtk.CellRendererText()
render_text.set_property("editable",True)
store.append(["1","hello world"])
for i in range(2, 500):
   store.append([str(i), "Hello world" + str(i)])

render_text1 = Gtk.CellRendererText()
column=Gtk.TreeViewColumn("case", render_text, text=1)
column1 = Gtk.TreeViewColumn("number", render_text1, text=0)


tree.append_column(column1)
tree.append_column(column)


sw = Gtk.ScrolledWindow()
sw.add_with_viewport(tree)

win.add(sw)
win.show_all()

win.connect("destroy", Gtk.main_quit)
Gtk.main()