diff -r 1c58e3e589a5 src/org/python/core/PyDictionary.java
--- a/src/org/python/core/PyDictionary.java	Tue Nov 18 17:51:36 2014 -0800
+++ b/src/org/python/core/PyDictionary.java	Fri Nov 21 11:21:17 2014 -0800
@@ -613,7 +613,7 @@
     final PyObject dict_pop(PyObject key, PyObject defaultValue) {
         if (!getMap().containsKey(key)) {
             if (defaultValue == null) {
-                throw Py.KeyError("popitem(): dictionary is empty");
+                throw Py.KeyError(key.asString());
             }
             return defaultValue;
         }