1 files changed, 12 insertions, 7 deletions
diff --git a/logilab/common/visitor.py b/logilab/common/visitor.py
index 0698bae..8d80d54 100644
--- a/logilab/common/visitor.py
+++ b/logilab/common/visitor.py
@@ -23,15 +23,16 @@
 """
 from typing import Any, Callable, Optional, Union
 from logilab.common.types import Node, HTMLWriter, TextWriter
+
 __docformat__ = "restructuredtext en"
 
 
 def no_filter(_: Node) -> int:
     return 1
 
+
 # Iterators ###################################################################
 class FilteredIterator(object):
-
     def __init__(self, node: Node, list_func: Callable, filter_func: Optional[Any] = None) -> None:
         self._next = [(node, 0)]
         if filter_func is None:
@@ -41,14 +42,14 @@ class FilteredIterator(object):
     def __next__(self) -> Optional[Node]:
         try:
             return self._list.pop(0)
-        except :
+        except:
             return None
 
     next = __next__
 
+
 # Base Visitor ################################################################
 class Visitor(object):
-
     def __init__(self, iterator_class, filter_func=None):
         self._iter_class = iterator_class
         self.filter = filter_func
@@ -87,11 +88,13 @@ class Visitor(object):
         """
         return result
 
+
 # standard visited mixin ######################################################
 class VisitedMixIn(object):
     """
     Visited interface allow node visitors to use the node
     """
+
     def get_visit_name(self) -> str:
         """
         return the visit name for the mixed class. When calling 'accept', the
@@ -101,14 +104,16 @@ class VisitedMixIn(object):
         try:
             # mypy: "VisitedMixIn" has no attribute "TYPE"
             # dynamic attribute
-            return self.TYPE.replace('-', '_')  # type: ignore
+            return self.TYPE.replace("-", "_")  # type: ignore
         except:
             return self.__class__.__name__.lower()
 
-    def accept(self, visitor: Union[HTMLWriter, TextWriter], *args: Any, **kwargs: Any) -> Optional[Any]:
-        func = getattr(visitor, 'visit_%s' % self.get_visit_name())
+    def accept(
+        self, visitor: Union[HTMLWriter, TextWriter], *args: Any, **kwargs: Any
+    ) -> Optional[Any]:
+        func = getattr(visitor, "visit_%s" % self.get_visit_name())
         return func(self, *args, **kwargs)
 
     def leave(self, visitor, *args, **kwargs):
-        func = getattr(visitor, 'leave_%s' % self.get_visit_name())
+        func = getattr(visitor, "leave_%s" % self.get_visit_name())
         return func(self, *args, **kwargs)