In development based on Quickly, why do codes start with “from gi.repository import Gtk”?

Question

I am developing apps in Quickly. Default codes start with from gi.repository import Gtk. Why is it so and not simply import gtk for example?

The point is, a lot of tutorials, documentation and forums answers on the web are based on the second importation, as far as I have seen.

Answer 1

from gi.repository import Gtk uses the new PyGObject instead of the older PyGTK that is used with import gtk.