homepage

When a class definition was re-executed (reload, exec ..) , pickling of existing instances fails for to picky reason (class object id mismatch). Solved by the one liner patch below.
Rational: Python is dynamic. Like with any normal attribute lookup: When its the same module/..name this class is really meant - no matter about its id. 
(During unpickling its another id anyway, the code may have evolved years ...)
diff -ur --strip _orig/pickle.py ./pickle.py
--- _orig/pickle.py	2008年09月08日 10:58:32 +0000
+++ ./pickle.py	2011年11月24日 15:47:11 +0000
@@ -747,7 +747,7 @@
 "Can't pickle %r: it's not found as %s.%s" %
 (obj, module, name))
 else:
- if klass is not obj:
+ if klass.__name__ != obj.__name__:
 raise PicklingError(
 "Can't pickle %r: it's not the same object as %s.%s" %
 (obj, module, name))