Make the classes exposed by threading.py new-style classes. This is

mostly for convenience and to aid debugging.

Lib/threading.py

@@ -24,13 +24,17 @@
 del thread
 
 
-# Debug support (adapted from ihooks.py)
+# Debug support (adapted from ihooks.py).
+# All the major classes here derive from _Verbose.  We force that to
+# be a new-style class so that all the major classes here are new-style.
+# This helps debugging (type(instance) is more revealing for instances
+# of new-style classes).
 
 _VERBOSE = False
 
 if __debug__:
 
-    class _Verbose:
+    class _Verbose(object):
 
         def __init__(self, verbose=None):
             if verbose is None:
@@ -46,7 +50,7 @@ def _note(self, format, *args):
 
 else:
     # Disable this when using "python -O"
-    class _Verbose:
+    class _Verbose(object):
         def __init__(self, verbose=None):
             pass
         def _note(self, *args):

Misc/NEWS

@@ -24,6 +24,9 @@ Extension modules
 Library
 -------
 
+- The classes in threading.py are now new-style classes.  That they
+  weren't before was an oversight.
+
 - SF bug 763023: fix uncaught ZeroDivisionError in difflib ratio methods
   when there are no lines.