Removed the API to create unbound methods and simplified the API for bound methods. The signature is PyMethod_New(func, instance).
Also removed im_class and renamed im_self to __self__ and im_func to __func__. im_class can be substituted with method.__self__.__class__.
I've also updated some parts of the documenation.
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index f40a553..aecb317 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -1081,7 +1081,7 @@
         f = CallWrapper(func, subst, self).__call__
         name = repr(id(f))
         try:
-            func = func.im_func
+            func = func.__func__
         except AttributeError:
             pass
         try: