From: Guido van Rossum <guido@python.org>
Date: Mon, 10 Jun 2002 21:37:00 +0000 (+0000)
Subject: Backport:
X-Git-Tag: v2.2.2b1~335
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9396d834be5412dd28257c363cd1eec5269f2a40;p=thirdparty%2FPython%2Fcpython.git

Backport:

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'.
---

diff --git a/Lib/copy.py b/Lib/copy.py
index bfe06e342dc6..1cb258c2f28f 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