diff --git a/sksurgerytutorial01/vtk_aruco_app.py b/sksurgerytutorial01/vtk_aruco_app.py
index 6c90c06..84e68b7 100644
--- a/sksurgerytutorial01/vtk_aruco_app.py
+++ b/sksurgerytutorial01/vtk_aruco_app.py
@@ -63,7 +63,8 @@ def update_view(self):
         #see what happens.
         self.vtk_overlay_window.set_camera_state({"ClippingRange": [10, 800]})
         self.vtk_overlay_window.set_video_image(image)
-        self.vtk_overlay_window.Initialize() # Allows the interactor to initialize itself.
+        # Allows the interactor to initialize itself.
+        self.vtk_overlay_window.Initialize()
         self.vtk_overlay_window.Start()  # Start the event loop.
         self.vtk_overlay_window.Render()
 
@@ -100,11 +101,11 @@ def _move_camera(self, tag2camera):
 if __name__ == '__main__':
     app = QApplication([])
 
-    video_source = 0
-    viewer = OverlayApp(video_source)
+    VIDEO_SOURCE = 0
+    viewer = OverlayApp(VIDEO_SOURCE)
 
-    model_dir = '../models'
-    viewer.add_vtk_models_from_dir(model_dir)
+    MODEL_DIR = '../models'
+    viewer.add_vtk_models_from_dir(MODEL_DIR)
 
     viewer.show()
     viewer.start()
diff --git a/sksurgerytutorial01/vtkoverlay_app.py b/sksurgerytutorial01/vtkoverlay_app.py
index 785d48c..774f573 100644
--- a/sksurgerytutorial01/vtkoverlay_app.py
+++ b/sksurgerytutorial01/vtkoverlay_app.py
@@ -19,7 +19,8 @@ def update_view(self):
         and render"""
         _, image = self.video_source.read()
         self.vtk_overlay_window.set_video_image(image)
-        self.vtk_overlay_window.Initialize() # Allows the interactor to initialize itself.
+        # Allows the interactor to initialize itself.
+        self.vtk_overlay_window.Initialize()
         self.vtk_overlay_window.Start()  # Start the event loop.
         self.vtk_overlay_window.Render()
 
@@ -34,14 +35,14 @@ def update_view(self):
     #is set when we create the instance. This is an index
     #starting at 0. If you have more than one webcam, you can
     #try using different numbered sources
-    video_source = 0
-    viewer = OverlayApp(video_source)
+    VIDEO_SOURCE = 0
+    viewer = OverlayApp(VIDEO_SOURCE)
 
     #Set a model directory containing the models you wish
     #to render and optionally a colours.txt defining the
     #colours to render in.
-    model_dir = '../models'
-    viewer.add_vtk_models_from_dir(model_dir)
+    MODEL_DIR = '../models'
+    viewer.add_vtk_models_from_dir(MODEL_DIR)
 
     #start the viewer
     viewer.show()
diff --git a/sksurgerytutorial01/vtkoverlay_with_movement_app.py b/sksurgerytutorial01/vtkoverlay_with_movement_app.py
index 562769d..7b1c8ac 100644
--- a/sksurgerytutorial01/vtkoverlay_with_movement_app.py
+++ b/sksurgerytutorial01/vtkoverlay_with_movement_app.py
@@ -23,7 +23,8 @@ def update_view(self):
         self._move_model()
 
         self.vtk_overlay_window.set_video_image(image)
-        self.vtk_overlay_window.Initialize() # Allows the interactor to initialize itself.
+        # Allows the interactor to initialize itself.
+        self.vtk_overlay_window.Initialize()
         self.vtk_overlay_window.Start()  # Start the event loop.
         self.vtk_overlay_window.Render()
 
@@ -44,11 +45,11 @@ def _move_model(self):
 if __name__ == '__main__':
     app = QApplication([])
 
-    video_source = 0
-    viewer = OverlayApp(video_source)
+    VIDEO_SOURCE = 0
+    viewer = OverlayApp(VIDEO_SOURCE)
 
-    model_dir = '../models'
-    viewer.add_vtk_models_from_dir(model_dir)
+    MODEL_DIR = '../models'
+    viewer.add_vtk_models_from_dir(MODEL_DIR)
 
     viewer.show()
     viewer.start()
diff --git a/tests/pylintrc b/tests/pylintrc
index 9596f1c..a93fb5d 100644
--- a/tests/pylintrc
+++ b/tests/pylintrc
@@ -32,7 +32,8 @@ unsafe-load-any-extension=no
 # A comma-separated list of package or module names from where C extensions may
 # be loaded. Extensions are loading into the active Python interpreter and may
 # run arbitrary code
-extension-pkg-whitelist=numpy
+extension-pkg-whitelist=numpy, PySide6
+extension-pkg-allow-list=PySide6
 
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