just some warnings when starting :
/home/npomarede/src/hatari.git/python-ui/./hatariui.py:463: 
DeprecationWarning: Gtk.ActionGroup.list_actions is deprecated
   self.action_names = [x.get_name() for x in self.actions.list_actions()]
/home/npomarede/src/hatari.git/python-ui/./hatariui.py:463: 
DeprecationWarning: Gtk.Action.get_name is deprecated
   self.action_names = [x.get_name() for x in self.actions.list_actions()]
--right about,|,run,pause,forward,|,reset,|,quit
--embed
/home/npomarede/src/hatari.git/python-ui/./hatariui.py:652: 
DeprecationWarning: Gtk.Action.set_accel_group is deprecated
   action.set_accel_group(accelgroup)
/home/npomarede/src/hatari.git/python-ui/./hatariui.py:617: 
DeprecationWarning: Gtk.ActionGroup.get_action is deprecated
   action = self.actions.get_action(name)
/home/npomarede/src/hatari.git/python-ui/./hatariui.py:618: 
DeprecationWarning: Gtk.Action.create_menu_item is deprecated
   item = action.create_menu_item()
/home/npomarede/src/hatari.git/python-ui/./hatariui.py:601: 
DeprecationWarning: Gtk.Action.create_tool_item is deprecated
   widget = self.actions.get_action(action).create_tool_item()
Apart from that it seems to work when going in all the menus and running 
hatari.