Index: pyyaml/trunk/lib/yaml/constructor.py
===================================================================
--- pyyaml/trunk/lib/yaml/constructor.py	(revision 142)
+++ pyyaml/trunk/lib/yaml/constructor.py	(revision 146)
@@ -457,5 +457,9 @@
                     "expected non-empty name appended to the tag", mark)
         if u'.' in name:
-            module_name, object_name = name.rsplit('.', 1)
+            # Python 2.4 only
+            #module_name, object_name = name.rsplit('.', 1)
+            items = name.split('.')
+            object_name = items.pop()
+            module_name = '.'.join(items)
         else:
             module_name = '__builtin__'