@@ -1475,7 +1475,7 @@ class DotWidget(gtk.DrawingArea):

             return False

         try:

             self.set_xdotcode(xdotcode)

-        except ParseError, ex:

+        except ParseError as ex:

             dialog = gtk.MessageDialog(type=gtk.MESSAGE_ERROR,

                                        message_format=str(ex),

                                        buttons=gtk.BUTTONS_OK)

@@ -1880,7 +1880,7 @@ class DotWindow(gtk.Window):

             fp = file(filename, 'rt')

             self.set_dotcode(fp.read(), filename)

             fp.close()

-        except IOError, ex:

+        except IOError as ex:

             dlg = gtk.MessageDialog(type=gtk.MESSAGE_ERROR,

                                     message_format=str(ex),

                                     buttons=gtk.BUTTONS_OK)