diff --git a/tracetools_analysis/tracetools_analysis/processor/__init__.py b/tracetools_analysis/tracetools_analysis/processor/__init__.py
index 698359f..a0fedda 100644
--- a/tracetools_analysis/tracetools_analysis/processor/__init__.py
+++ b/tracetools_analysis/tracetools_analysis/processor/__init__.py
@@ -346,8 +346,11 @@ class Processor():
 
         :param handler_type: the type of EventHandler subclass to find
         :return: the EventHandler instance if found, otherwise `None`
-        """ 
-        return next((handler for handler in self._expanded_handlers if type(handler) is handler_type), None)
+        """
+        return next(
+            (handler for handler in self._expanded_handlers if type(handler) is handler_type),
+            None,
+        )
 
     @staticmethod
     def get_event_names(