Fixed #1046 -- Made syndication feed framework not swallow TypeErrors in functions. Thanks, junzhang.jn

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2341 bcc190cf-cafb-0310-a4f2-bffc1f526a37

AUTHORS

@@ -61,6 +61,7 @@ answer newbie questions, and generally made Django that much better:
     Robert Rock Howard <http://djangomojo.com/>
     Jason Huggins <http://www.jrandolph.com/blog/>
     Michael Josephson <http://www.sdjournal.com/>
+    junzhang.jn@gmail.com
     Russell Keith-Magee <freakboy@iinet.net.au>
     Garth Kidd <http://www.deadlybloodyserious.com/>
     Sune Kirkeby <http://ibofobi.dk/>

django/contrib/syndication/feeds.py

@@ -33,9 +33,17 @@ class Feed:
         except AttributeError:
             return default
         if callable(attr):
-            try:
+            # Check func_code.co_argcount rather than try/excepting the
+            # function and catching the TypeError, because something inside
+            # the function may raise the TypeError. This technique is more
+            # accurate.
+            if hasattr(attr, 'func_code'):
+                argcount = attr.func_code.co_argcount
+            else:
+                argcount = attr.__call__.func_code.co_argcount
+            if argcount == 2: # one argument is 'self'
                 return attr(obj)
-            except TypeError:
+            else:
                 return attr()
         return attr