Ok, I get it, I was trying to change a predefined size and
I didn't know that function.

Thank You Dieter.

El mié, 03-03-2010 a las 19:49 +0100, Dieter Verfaillie escribió: 

> Quoting "Joel Juvenal Rivera Rivera" <[email protected]>:
> > Hello,
> > I hope somebody could help me with this...
> >
> > when I do:
> >  paper = gtk.PaperSize()
> >  paper.set_size(216,140,gtk.UNIT_MM)
> >
> > raise this warning:
> >  GtkWarning: gtk_paper_size_set_size: assertion `size->is_custom' failed
> >
> > And the size of the paper remains unchanged.
> 
> You could try the following to create a custom paper size:
> >>> paper = gtk.paper_size_new_custom('newcustom',  
> >>> 'new_custom_papersize', 216, 140, gtk.UNIT_MM)
> >>> paper.is_custom()
> True
> 
> Regards,
> Dieter
> 
> 
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