OverflowError: With Python 3 Gtk.ListStore only accepts 32 Bit Integers.

[Wolf Pichler]

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

This works in Python 2:

mystore = Gtk.ListStore(long)
mystore.insert_with_valuesv(-1, [1], [long(1330400507426)])

This does not work in Python 3:

mystore = Gtk.ListStore(int)
mystore.insert_with_valuesv(-1, [1], [int(1330400507426)])

OverflowError: Item 0: out of range for int property

----

lsb_release -rd
Description: Ubuntu 18.04.4 LTS
Release: 18.04

apt-cache policy python3-gi
python3-gi:
  Installed: 3.26.1-2ubuntu1
  Candidate: 3.26.1-2ubuntu1
  Version table:
 *** 3.26.1-2ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     3.26.1-2 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

python3 -V
Python 3.6.9

[Sebastien Bacher (seb128)]

Thank you for your bug report, that seems similar to https://gitlab.gnome.org/GNOME/pygobject/issues/198

[Wolf Pichler (w-pichler)]

I'm not sure what exactly they are really talking about at
https://gitlab.gnome.org/GNOME/pygobject/issues/198.

My FR concerns 3.26.1-2ubuntu1 and at gitlab it is stated "I think it
used to work in 3.26." which

clearly is not the case.

I took a look into the source and in pygi-value.c I found this:

case G_TYPE_INT:
    {
        glong val = PYGLIB_PyLong_AsLong(obj);
        if (val == -1 && PyErr_Occurred ())
            return -1;
        if (val > G_MAXINT || val < G_MININT) {
            PyErr_SetString(PyExc_OverflowError, "out of range for int
property");
            return -1;
        }
        g_value_set_int(value, (gint)val);
        break;
    }

and a lot of comments like this:

#if PY_VERSION_HEX < 0x03000000

[snip]

#endif

To me this means that somebody is/was aware of the fact that some more
work has to be done for

making this stuff compatible to Python 3.

On 09.03.20 14:48, Sebastien Bacher wrote:
> Thank you for your bug report, that seems similar to
> https://gitlab.gnome.org/GNOME/pygobject/issues/198
>
> ** Bug watch added: gitlab.gnome.org/GNOME/pygobject/issues #198
> https://gitlab.gnome.org/GNOME/pygobject/issues/198
>
> ** Changed in: pygobject (Ubuntu)
> Importance: Undecided => Low
>

[Sebastien Bacher (seb128)]

COuld you test the upstream workaround and use GObject.Value(GObject.TYPE_UINT64, 1330400507426) ?

[Wolf Pichler (w-pichler)]

It works!

On 09.03.20 21:17, Sebastien Bacher wrote:
> COuld you test the upstream workaround and use
> GObject.Value(GObject.TYPE_UINT64, 1330400507426) ?
>

[Christoph Reiter (lazka)]

"int" maps to the same underlying type in Python 2 and Python 3. This wasn't changed when pygobject was ported to Python 3 and can't really be changed now. If you want be sure your numbers fit use the suggested "GObject.TYPE_*", or just use "object" which means the Python int object is stored as is, assuming you don't need to access it in C code somewhere else.

[Wolf Pichler (w-pichler)]

It should indeed be done like this:

 import gi
 gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk

 from gi.repository import GObject

 mystore = Gtk.ListStore(GObject.TYPE_UINT64)
 mystore.insert_with_valuesv(-1, [1], [GObject.Value(GObject.TYPE_UINT64, 1330400507426)])

###

I was completely unaware of that possibility because the source of my GTK knowlege is

https://lazka.github.io/pgi-docs/#Gtk-3.0/classes/ListStore.html#Gtk.ListStore.set_column_types

When checking out the available types one ends up here:

https://lazka.github.io/pgi-docs/#GObject-2.0/classes/GType.html#GObject.GType

Which does not ring any bell ...

So I did it like in

https://python-gtk-3-tutorial.readthedocs.io/en/latest/treeview.html#the-model

where the Python types are used.

###

With the knowlege I gained through this FR it was possible to find this:

GObject Built-in Type Constants
The Built-in Type constants specify the pre-defined types used by gobject.

https://developer.gnome.org/pygobject/stable/gobject-constants.html#gobject-type-constants

which is quite useful.

###

Thanks!

On 11.03.20 17:56, Christoph Reiter wrote:
> import gi
> gi.require_version('Gtk', '3.0')
> from gi.repository import Gtk
>
> This works in Python 2:
>
> mystore = Gtk.ListStore(long)
> mystore.insert_with_valuesv(-1, [1], [long(1330400507426)])
>
> This does not work in Python 3:
>
> mystore = Gtk.ListStore(int)
> mystore.insert_with_valuesv(-1, [1], [int(1330400507426)])