Merge pull request InigoMoreno#1 from DeepX-inc/fix/python2->3

fix errors in python2/3 incompatibilities

Author: TYDAN923

smach_viewer/smach_viewer/smach_viewer_gui.py

@@ -274,10 +274,10 @@ def get_dotcode(self, selected_paths, closed_paths, depth, max_depth, containers
                     dotstr += '"%s" %s;\n' % (child_path, attr_string(child_attrs))
 
             # Iterate over edges
-            internal_edges = zip(
+            internal_edges = list(zip(
                     self._internal_outcomes,
                     self._outcomes_from,
-                    self._outcomes_to)
+                    self._outcomes_to))
 
             # Add edge from container label to initial state
             internal_edges += [('','__proxy__',initial_child) for initial_child in self._initial_states]

smach_viewer/smach_viewer/xdot/xdot.py

@@ -569,7 +569,7 @@ def __init__(self, parser, buf):
         self.pen = Pen()
         self.shapes = []
 
-    def __nonzero__(self):
+    def __bool__(self):
         return self.pos < len(self.buf)
 
     def unescape(self, buf):