1 files changed, 1 insertions, 1 deletions
diff --git a/tree.py b/tree.py
index 551c2d2..fa168ef 100644
--- a/tree.py
+++ b/tree.py
@@ -322,7 +322,7 @@ def post_order_list(node, filter_func=no_filter):
     return l
 
 def pre_order_list(node, filter_func=no_filter):
-    """ 
+    """
     create a list with tree nodes for which the <filter> function returned true
     in a pre order fashion
     """