diff -r 1043cc2cb0ff Lib/test/test_itertools.py
--- a/Lib/test/test_itertools.py	Sat Sep 07 15:24:01 2013 +0300
+++ b/Lib/test/test_itertools.py	Sat Sep 07 18:27:42 2013 +0300
@@ -1104,6 +1104,18 @@
                         [1, 3, 5])
         self.pickletest(takewhile(underten, data))
 
+        # check .last
+        t = takewhile(underten, data)
+        self.assertEqual(t.last, None)
+        self.assertEqual(list(t), [1, 3, 5])
+        self.assertEqual(t.last, 20)
+        
+        # check .last is None if no item failed
+        t = takewhile(underten, [1, 3, 5, 7])
+        self.assertEqual(t.last, None)
+        self.assertEqual(list(t), [1, 3, 5, 7])
+        self.assertEqual(t.last, None) 
+
     def test_dropwhile(self):
         data = [1, 3, 5, 20, 2, 4, 6, 8]
         self.assertEqual(list(dropwhile(underten, data)), [20, 2, 4, 6, 8])
diff -r 1043cc2cb0ff Modules/itertoolsmodule.c
--- a/Modules/itertoolsmodule.c	Sat Sep 07 15:24:01 2013 +0300
+++ b/Modules/itertoolsmodule.c	Sat Sep 07 18:27:42 2013 +0300
@@ -1216,6 +1216,7 @@
     PyObject_HEAD
     PyObject *func;
     PyObject *it;
+    PyObject *last;
     long         stop;
 } takewhileobject;
 
@@ -1226,6 +1227,7 @@
 {
     PyObject *func, *seq;
     PyObject *it;
+    PyObject *last;
     takewhileobject *lz;
 
     if (type == &takewhile_type && !_PyArg_NoKeywords("takewhile()", kwds))
@@ -1250,6 +1252,10 @@
     lz->it = it;
     lz->stop = 0;
 
+    last = Py_None;
+    Py_INCREF(last);
+    lz->last = last;
+
     return (PyObject *)lz;
 }
 
@@ -1259,6 +1265,7 @@
     PyObject_GC_UnTrack(lz);
     Py_XDECREF(lz->func);
     Py_XDECREF(lz->it);
+    Py_XDECREF(lz->last);
     Py_TYPE(lz)->tp_free(lz);
 }
 
@@ -1267,6 +1274,7 @@
 {
     Py_VISIT(lz->it);
     Py_VISIT(lz->func);
+    Py_VISIT(lz->last);
     return 0;
 }
 
@@ -1293,9 +1301,12 @@
     Py_DECREF(good);
     if (ok == 1)
         return item;
+    if (ok == 0) {
+        Py_INCREF(item);
+        lz->stop = 1;
+        lz->last = item;
+    }
     Py_DECREF(item);
-    if (ok == 0)
-        lz->stop = 1;
     return NULL;
 }
 
@@ -1307,6 +1318,16 @@
 }
 
 static PyObject *
+takewhile_last_get(takewhileobject *lz)
+{
+   if(lz->last) {
+       Py_INCREF(lz->last);
+       return lz->last;
+   }
+   Py_RETURN_NONE;
+}
+
+static PyObject *
 takewhile_reduce_setstate(takewhileobject *lz, PyObject *state)
 {
     int stop = PyObject_IsTrue(state);
@@ -1316,6 +1337,12 @@
     Py_RETURN_NONE;
 }
 
+static PyGetSetDef takewhile_getset[] = {
+    {"last", (getter)takewhile_last_get, (setter)NULL},
+    {NULL}
+};
+
+
 static PyMethodDef takewhile_reduce_methods[] = {
     {"__reduce__",      (PyCFunction)takewhile_reduce,      METH_NOARGS,
      reduce_doc},
@@ -1361,7 +1388,7 @@
     (iternextfunc)takewhile_next,       /* tp_iternext */
     takewhile_reduce_methods,           /* tp_methods */
     0,                                  /* tp_members */
-    0,                                  /* tp_getset */
+    takewhile_getset,                   /* tp_getset */
     0,                                  /* tp_base */
     0,                                  /* tp_dict */
     0,                                  /* tp_descr_get */