From 11ade1ddc053dcec884e2431b55fb1c1727c65d7 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Mon, 10 Jun 2002 21:10:27 +0000
Subject: SF patch 560794 (Greg Chapman): deepcopy can't handle custom
 metaclasses.

This is essentially the same problem as that reported in bug 494904
for pickle: deepcopy should treat instances of custom metaclasses the
same way it treats instances of type 'type'.

Bugfix candidate.
---
 Lib/copy.py | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/Lib/copy.py b/Lib/copy.py
index 77b7ad3..7d06042 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -164,17 +164,24 @@ def deepcopy(x, memo = None):
         copierfunction = _deepcopy_dispatch[type(x)]
     except KeyError:
         try:
-            copier = x.__deepcopy__
-        except AttributeError:
+            issc = issubclass(type(x), type)
+        except TypeError:
+            issc = 0
+        if issc:
+            y = _deepcopy_dispatch[type](x, memo)
+        else:
             try:
-                reductor = x.__reduce__
+                copier = x.__deepcopy__
             except AttributeError:
-                raise error, \
-                      "un-deep-copyable object of type %s" % type(x)
+                try:
+                    reductor = x.__reduce__
+                except AttributeError:
+                    raise error, \
+                       "un-deep-copyable object of type %s" % type(x)
+                else:
+                    y = _reconstruct(x, reductor(), 1, memo)
             else:
-                y = _reconstruct(x, reductor(), 1, memo)
-        else:
-            y = copier(memo)
+                y = copier(memo)
     else:
         y = copierfunction(x, memo)
     memo[d] = y
-- 
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