Changes to copy() and deepcopy() in copy.py to support __reduce__ as a

fallback for objects that are neither supported by our dispatch table
nor have a __copy__ or __deepcopy__ method.

Changes to _reduce() in copy_reg.py to support reducing objects that
don't have a __dict__ -- copy.copy(complex()) now invokes _reduce().

Add tests for copy.copy() and copy.deepcopy() to test_regrtest.py.

1 files changed, 9 insertions, 1 deletions

diff --git a/Lib/copy_reg.py b/Lib/copy_reg.py
index eb02864..d469744 100644
--- a/Lib/copy_reg.py
+++ b/Lib/copy_reg.py
@@ -54,4 +54,12 @@ def _reduce(self):
         state = None
     else:
         state = base(self)
-    return _reconstructor, (self.__class__, base, state), self.__dict__
+    args = (self.__class__, base, state)
+    try:
+        dict = self.__dict__
+    except AttributeError:
+        dict = None
+    if dict:
+        return _reconstructor, args, dict
+    else:
+        return _reconstructor, args