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Using the following code for a Gtk.CellRenderSpin results in the following error after changing the spin button several times.
The error is:
/usr/lib/python2.7/dist-packages/gi/types.py:43: Warning: g_object_notify: assertion `G_IS_OBJECT (object)' failed
 return info.invoke(*args, **kwargs)
Segmentation fault
#! /usr/bin/env python
# -*- coding: utf-8 -*-
from gi.repository import Gtk
class CellRendererSpinWindow(Gtk.Window):
 def __init__(self):
 Gtk.Window.__init__(self, title="CellRendererSpin Example")
 self.set_default_size(200, 200)
 self.liststore = Gtk.ListStore(str, int)
 self.liststore.append(["Oranges", 5])
 self.liststore.append(["Apples", 4])
 self.liststore.append(["Bananas", 2])
 treeview = Gtk.TreeView(model=self.liststore)
 renderer_text = Gtk.CellRendererText()
 column_text = Gtk.TreeViewColumn("Fruit", renderer_text, text=0)
 treeview.append_column(column_text)
 renderer_spin = Gtk.CellRendererSpin()
 renderer_spin.connect("edited", self.on_amount_edited)
 renderer_spin.set_property("editable", True)
 adjustment = Gtk.Adjustment(0, 0, 100, 1, 10, 0)
 renderer_spin.set_property("adjustment", adjustment)
 column_spin = Gtk.TreeViewColumn("Amount", renderer_spin, text=1)
 treeview.append_column(column_spin)
 self.add(treeview)
 def on_amount_edited(self, widget, path, value):
 self.liststore[path][1] = int(value)
win = CellRendererSpinWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()
This code comes from http://python-gtk-3-tutorial.readthedocs.org/en/latest/cellrenderers.html
It is confirmed by another user via Ubuntu launchpad at https://bugs.launchpad.net/ubuntu/+source/pygobject/+bug/908889
My system is a Debian system tracking debian testing.
Exact python --version is Python 2.7.2+

Why do you think this is a bug in Python?
I don't think this is a bug in Python.
This might be bug in PyGTK or GTK which are third-party libraries.

@Narnie
This is the Python bug tracker, not the PyGTK one.
You should report your problems on the PyGTK/GTK bug tracker.
Thanks.

Understood. Didn't realize pythonized GTK was 3rd party.

PyGtk and the python bindings for GTK3 seem to be separate entities. I could find nothing about GTK3 on pygtk.org. Any ideas where the bug reporting goes for the python bindings for GTK3?