Python and Gtk

[Djoumé]

I begin with Python and Gtk and I have some unresolved question : 

I use Gtkinter and I have notice that a lot of gtk (or gdk) object miss in 
the gtk.py module. How can I do when I need these objects (for example 
Gdkfont)?

Where can I find the prototype (type of arguments) of a callback function 
must have (for example where can I find the type of arguments of a button 
pressed callback funtion)?

Djoumé

PS : I apologize for my english... (i am french)