diff --git a/skimage/viewer/tests/test_widgets.py b/skimage/viewer/tests/test_widgets.py
index d83f54ac6d6..a9f84fbd6cc 100644
--- a/skimage/viewer/tests/test_widgets.py
+++ b/skimage/viewer/tests/test_widgets.py
@@ -16,6 +16,7 @@ def get_image_viewer():
     viewer += Plugin()
     return viewer
 
+
 @skipif(not viewer_available)
 def test_check_box():
     viewer = get_image_viewer()
@@ -43,6 +44,7 @@ def test_combo_box():
     assert_equal(str(cb.val), 'c'),
     assert_equal(cb.index, 2)
 
+
 @skipif(not viewer_available)
 def test_text_widget():
     viewer = get_image_viewer()
diff --git a/skimage/viewer/widgets/core.py b/skimage/viewer/widgets/core.py
index 9a99d7e8376..0eebbe8cf0e 100644
--- a/skimage/viewer/widgets/core.py
+++ b/skimage/viewer/widgets/core.py
@@ -304,6 +304,7 @@ def val(self):
 
     @val.setter
     def val(self, i):
-        self._check_box.setChecked(i)   # setChecked has only two states:
-                                        # 0 = unchecked,  2 = checked
+        # setChecked has only two states:   0 = unchecked,  2 = checked
+        self._check_box.setChecked(i)   
+                                        
                                         
\ No newline at end of file
diff --git a/viewer_examples/plugins/tv_denoise.py b/viewer_examples/plugins/tv_denoise.py
index e4d06fb2a04..5ad527eca53 100644
--- a/viewer_examples/plugins/tv_denoise.py
+++ b/viewer_examples/plugins/tv_denoise.py
@@ -4,8 +4,8 @@
 from numpy import random, clip
 
 from skimage.viewer import ImageViewer
-from skimage.viewer.widgets import (Slider, CheckBox, OKCancelButtons, 
-									SaveButtons)
+from skimage.viewer.widgets import (Slider, CheckBox, OKCancelButtons,
+                                    SaveButtons)
 from skimage.viewer.plugins.base import Plugin