From: Guido van Rossum <guido@python.org>
Date: Wed, 19 Dec 2001 16:55:02 +0000 (+0000)
Subject: Pickler.save(): Fix for SF bug #494904: Cannot pickle a class with a
X-Git-Tag: v2.2.1c1~297
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f048a8f6d79173cc1da1bf12c60ae06fea36762c;p=thirdparty%2FPython%2Fcpython.git

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 8a079255f130..4cc6629d532e 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -163,6 +163,10 @@ class Pickler:
         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)