an AttributeError is perfectly acceptable here

benjaminp · benjaminp · commit c262a69f545b · 2010-06-30T18:41:08.000Z
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
@@ -211,7 +211,7 @@ def trunc(x): return x
         try:
             result.st_mode = 1
             self.fail("No exception thrown")
-        except TypeError:
+        except (AttributeError, TypeError):
             pass
 
         try:
