Index: Lib/asyncore.py
===================================================================
--- Lib/asyncore.py	(revisione 80273)
+++ Lib/asyncore.py	(copia locale)
@@ -396,7 +396,11 @@
     # cheap inheritance, used to pass all other attribute
     # references to the underlying socket object.
     def __getattr__(self, attr):
-        return getattr(self.socket, attr)
+        try:
+            return getattr(self.socket, attr)
+        except AttributeError:
+            raise AttributeError("%s instance has no attribute '%s'"
+                                 %(self.__class__.__name__, attr))
 
     # log and log_info may be overridden to provide more sophisticated
     # logging and warning methods. In general, log is for 'hit' logging