Pickler.save(): Fix for SF bug #494904: Cannot pickle a class with a
metaclass, reported by Dan Parisien.
Objects that are instances of custom metaclasses, i.e. whose class is
a subclass of 'type', should be pickled the same as new-style classes
(objects whose class is 'type'). This can't be done through a
dispatch table entry, and the __reduce__ trick doesn't work for these,
since it finds the unbound __reduce__ for instances of the class
(inherited from 'object'). So check explicitly using issubclass().
diff --git a/Lib/pickle.py b/Lib/pickle.py
index 8a07925..4cc6629 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -163,6 +163,10 @@
try:
f = self.dispatch[t]
except KeyError:
+ if issubclass(t, TypeType):
+ self.save_global(object)
+ return
+
pid = self.inst_persistent_id(object)
if pid is not None:
self.save_pers(pid)