Index: org/python/core/__builtin__.java
===================================================================
RCS file: /cvsroot/jython/jython/org/python/core/__builtin__.java,v
retrieving revision 2.57
diff -u -r2.57 __builtin__.java
--- org/python/core/__builtin__.java	6 Aug 2003 11:46:26 -0000	2.57
+++ org/python/core/__builtin__.java	19 Feb 2005 21:11:20 -0000
@@ -913,6 +922,27 @@
         return o.__str__();
     }
 
+    public static PyObject sum(PyObject seq, PyObject result) {
+
+        if(result instanceof PyString) {
+            throw Py.TypeError("sum() can't sum strings [use ''.join(seq) instead]");
+        }
+
+        PyObject iter = seq.__iter__();
+        for(;;) {
+            PyObject item = iter.__iternext__();
+            if(item == null) {
+                break;
+            }
+            result = result._add(item);
+        }
+        return result;
+    }
+
+    public static PyObject sum(PyObject seq) {
+        return sum(seq, Py.Zero);
+    }
+
     public static PyString unicode(PyObject v) {
         return unicode(v.__str__(), null, null);
     }