Initial Python 3 compatible code

src/extra/SoundsTutorial/__init__.py

@@ -1,2 +1,3 @@
 from __future__ import absolute_import
+from __future__ import unicode_literals
 from .soundsTutorial import soundsTutorial

src/extra/SoundsTutorial/gtk_ui.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
 from gi.repository import Gtk
 import widgetUtils
 

src/extra/SoundsTutorial/reverse_sort.py

@@ -1,3 +1,4 @@
+from __future__ import unicode_literals
 #Reverse sort, by Bill Dengler <codeofdusk@gmail.com> for use in TWBlue http://twblue.es
 def invert_tuples(t):
     "Invert a list of tuples, so that the 0th element becomes the -1th, and the -1th becomes the 0th."

src/extra/SoundsTutorial/soundsTutorial.py

@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import absolute_import
+from __future__ import unicode_literals
+from builtins import object
 import platform
 import widgetUtils
 import os

src/extra/SoundsTutorial/soundsTutorial_constants.py

@@ -1,5 +1,6 @@
 #-*- coding: utf-8 -*-
 from __future__ import absolute_import
+from __future__ import unicode_literals
 #-*- coding: utf-8 -*-
 from . import reverse_sort
 import application

src/extra/SoundsTutorial/wx_ui.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
 import wx
 import widgetUtils