diff --git a/src/Cxx/IO/TransientHDFReader.cxx b/src/Cxx/IO/TransientHDFReader.cxx
index bd5328eb7015fb114ed0700c699d8865780f4fc9..53e86e729e6360dd492c72eabf04a4d5f7b4499e 100644
--- a/src/Cxx/IO/TransientHDFReader.cxx
+++ b/src/Cxx/IO/TransientHDFReader.cxx
@@ -1,4 +1,3 @@
-#include <cstdlib>
 #include <vtkCallbackCommand.h>
 #include <vtkCommand.h>
 #include <vtkDiscretizableColorTransferFunction.h>
@@ -16,13 +15,16 @@
 #include <vtkRenderWindowInteractor.h>
 #include <vtkRenderer.h>
 
+#include <cstdlib>
+
 namespace {
 vtkNew<vtkDiscretizableColorTransferFunction> GetCTF();
+
 void Animate(vtkObject* caller, unsigned long eid, void* clientdata,
              void* calldata);
 } // namespace
 
-int main(int ac, char** av)
+int main(int ac, char* av[])
 {
   if (ac != 2)
   {
@@ -37,7 +39,7 @@ int main(int ac, char** av)
   vtkNew<vtkHDFReader> reader;
   reader->SetFileName(av[1]);
   reader->Update();
-  std::cout << "number of steps: " << reader->GetNumberOfSteps() << endl;
+  std::cout << "Number of steps: " << reader->GetNumberOfSteps() << endl;
   auto polydata = vtkPolyData::SafeDownCast(reader->GetOutput());
 
   // Render the dataset.
@@ -61,14 +63,15 @@ int main(int ac, char** av)
   renWin->SetSize(1024, 512);
   renWin->Render();
 
+  // Add the interactor.
+  vtkNew<vtkRenderWindowInteractor> iren;
+  iren->SetRenderWindow(renWin);
+
   // Add the animation callback.
   vtkNew<vtkCallbackCommand> command;
   command->SetCallback(&Animate);
   command->SetClientData(reader);
 
-  // Add the interactor.
-  vtkNew<vtkRenderWindowInteractor> iren;
-  iren->SetRenderWindow(renWin);
   iren->AddObserver(vtkCommand::TimerEvent, command);
   iren->CreateRepeatingTimer(50);
 
diff --git a/src/Python/IO/TransientHDFReader.py b/src/Python/IO/TransientHDFReader.py
index e1015b53fbeb99f39d3aebecfd11ef49e612fe38..1fc7e958447bc672f1f4e270012067f99fcabc6f 100755
--- a/src/Python/IO/TransientHDFReader.py
+++ b/src/Python/IO/TransientHDFReader.py
@@ -35,7 +35,7 @@ def main():
     reader = vtkHDFReader()
     reader.SetFileName(fn)
     reader.Update()
-    print('number of steps: ', reader.GetNumberOfSteps())
+    print('Number of steps: ', reader.GetNumberOfSteps())
     polydata = reader.GetOutput()
 
     # Render the dataset
@@ -63,6 +63,7 @@ def main():
     iren = vtkRenderWindowInteractor()
     iren.SetRenderWindow(ren_win)
     iren.CreateRepeatingTimer(50)
+
     # Add the animation callback
     observer = AnimationObserver(iren, reader)
     iren.AddObserver('TimerEvent', observer)
@@ -137,8 +138,8 @@ class AnimationObserver(object):
         self.reader = reader
 
     def __call__(self, caller, ev):
-        x = 0 if (self.reader.GetStep() == self.reader.GetNumberOfSteps() - 1) else self.reader.GetStep() + 1
-        self.reader.SetStep(x)
+        step = 0 if (self.reader.GetStep() == self.reader.GetNumberOfSteps() - 1) else self.reader.GetStep() + 1
+        self.reader.SetStep(step)
         print('Current step: ', self.reader.GetStep())
         self.reader.Update()
         self.interactor.Render()