.

wcfs/internal/xbtree.py

@@ -414,11 +414,13 @@ def _assertIncv(v):
 # The checks are what is provided by BTree.check and node._check().
 class _ZChecker(zbcheck.Checker):
     def visit_btree(self, obj, *argv):
-        super(_ZChecker, self).visit_btree(obj, *argv)
+        #super(_ZChecker, self).visit_btree(obj, *argv)     zbcheck.Checker is old-style class
+        zbcheck.Checker.visit_btree(self, obj, *argv)
         obj._check() # also check internal C-level pointers consistency
 
     def visit_bucket(self, obj, *argv):
-        super(_ZChecker, self).visit_bucket(obj, *argv)
+        #super(_ZChecker, self).visit_bucket(obj, *argv)
+        zbcheck.Checker.visit_bucket(self, obj, *argv)
         obj._check() # ----//-----
 
 def _bcheck(ztree):