matplotlib
diff --git a/‎lib/matplotlib/testing/exceptions.py
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+11-5Lines changed: 11 additions & 5 deletions b/‎lib/matplotlib/testing/exceptions.py
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+11-5Lines changed: 11 additions & 5 deletions
@@ -1,10 +1,16 @@
 class KnownFailureTest(Exception):
-    '''Raise this exception to mark a test as a known failing test.'''
-    pass
+    """
+    Raise this exception to mark a test as a known failing test.
+    """
+
 
 class KnownFailureDidNotFailTest(Exception):
-    '''Raise this exception to mark a test should have failed but did not.'''
-    pass
+    """
+    Raise this exception to mark a test should have failed but did not.
+    """
+
 
 class ImageComparisonFailure(AssertionError):
-    '''Raise this exception to mark a test as a comparison between two images.'''
+    """
+    Raise this exception to mark a test as a comparison between two images.
+    """