[py3k] except as

Related to #268148.

__init__.py

@@ -268,7 +268,7 @@ def register_base_transforms(engine, verb=True):
     for trclass in cmdtransforms.transform_classes:
         try:
             engine.add_transform(trclass())
-        except MissingBinary, ex:
+        except MissingBinary as ex:
             if verb:
                 print ex
     return True

transforms/python.py

@@ -63,7 +63,7 @@ class Parser:
         self.out.write('<pre class="python">\n')
         try:
             tokenize.tokenize(text.readline, self)
-        except tokenize.TokenError, ex:
+        except tokenize.TokenError as ex:
             msg = ex[0]
             line = ex[1][0]
             self.out.write("<h5 class='error>'ERROR: %s%s</h5>" % (