Update to py3

src/appleseed.python/__init__.py

@@ -1,4 +1,3 @@
-
 #
 # This source file is part of appleseed.
 # Visit https://appleseedhq.net/ for additional information and resources.
@@ -33,7 +32,7 @@
 # in that case just load the normal appleseed.python module.
 try:
     from _appleseedpythonbuiltin import *
-except:
+except ImportError:
     from sys import hexversion as appleseed_python_hexversion
 
     if appleseed_python_hexversion < 0x030000F0:

src/appleseed.python/logtarget.py

@@ -33,7 +33,7 @@
 # in that case just load the normal appleseed.python module.
 try:
     from _appleseedpythonbuiltin import *
-except:
+except ImportError:
     from sys import hexversion as appleseed_python_hexversion
 
     if appleseed_python_hexversion < 0x030000F0:
@@ -44,9 +44,8 @@ except:
         from ._appleseedpython3 import *
 
 class ConsoleLogTarget(ILogTarget):
-
     def __init__(self, stream):
-        ILogTarget.__init__(self)
+        super().__init__()
         self.__stream = stream
 
     def write(self, category, file, line, header, message):
@@ -56,9 +55,8 @@ class ConsoleLogTarget(ILogTarget):
 
 
 class FileLogTarget(ILogTarget):
-
     def __init__(self):
-        ILogTarget.__init__(self)
+        super().__init__()
         self.__file = None
 
     def open(self, filename):
@@ -73,10 +71,10 @@ class FileLogTarget(ILogTarget):
             self.__file = None
 
     def is_open(self):
-        return self.__file != None
+        return self.__file is not None
 
     def write(self, category, file, line, header, message):
         if self.is_open():
             lines = message.split('\n')
             for line in lines:
-                self.__file.write(header + line + '\n')
+                self.__file.write(header + line + '\n')

src/appleseed.python/textureconverter.py

@@ -1,3 +1,36 @@
+# This source file is part of appleseed.
+# Visit https://appleseedhq.net/ for additional information and resources.
+#
+# This software is released under the MIT license.
+#
+# Copyright (c) 2012-2013 Esteban Tovagliari, Jupiter Jazz Limited
+# Copyright (c) 2014-2018 Esteban Tovagliari, The appleseedhq Organization
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+
+# The appleseed.python module built into appleseed.studio
+# is called _appleseedpythonbuiltin. Try to load it first.
+# If that fails it means that we are not in appleseed.studio;
+# in that case just load the normal appleseed.python module.
+
+
 import os
 import sys
 import logging