GTK+ Widget in Ubuntu?

Question

Python

Hello friends.
I was interested in writing a small program for Ubuntu in python ( according to the quick development guide for ubuntu ). I began to understand, try, and even something began to work out.
But I can’t figure out which widget in glade is responsible for drawing the window element, what’s in the picture:

This is a theme, beautiful design and all that, but I’m interested in this particular panel with the New, Save, etc. buttons. As I understand it, some standard icons are hung on them (which the faenza package then replaces). I couldn't really find anything on the topic in the gedit sources.
The panel has appeared in many new applications in the new ubuntu, including the mentioned gedit, app center, nautilus.
I don't have much experience with GTK+, so I'll forgive the help of experts.

Answer 1

In my opinion, this panel has nothing to do with the icons from your theme.
There is a class gtk.IconTheme and a function gtk.icon_theme_get_default, the latter gets the set icon theme for the current screen, after which you can get icons through the class and use it anywhere.