Index: Objects/dictobject.c
===================================================================
--- Objects/dictobject.c	(revision 43333)
+++ Objects/dictobject.c	(working copy)
@@ -2081,8 +2081,69 @@
 
 PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
 
+PyDoc_STRVAR( dictiter_delete_doc, "Mutable iter.delete" );
+
+static PyObject *
+dictiter_delete( dictiterobject *di ) 
+{
+	register int i;
+	register dictentry *ep;
+	PyObject *old_value, *old_key; 
+
+	dictobject *d = di->di_dict;
+
+	if (d==NULL)
+		return NULL;
+	assert( PyDict_Check( d ) );
+
+	i = di->di_pos - 1; 
+
+	if (i == -1 ) {
+		PyErr_SetString( PyExc_RuntimeError, 
+ "Attempted to call iter.delete() before first call to iter.next()" );
+		return NULL;
+	}
+	
+	if ( i> d->ma_mask ) {
+		PyErr_SetString( PyExc_RuntimeError,
+ "Attempted to call iter.delete() after iteration exhaustion." );
+		return NULL;
+	}
+
+	ep = d->ma_table+i;
+	
+	if ( ep->me_key == dummy ) {
+		PyErr_SetString( PyExc_RuntimeError,
+	 "Attempted to call iter.delete for already deleted item" );
+		return NULL;
+	}
+	
+	/* Things can change when I decref, so I'm going to put the
+	 dict back into a sane state first.*/
+
+	old_value = ep->me_value;
+	old_key = ep->me_key;
+ 
+	d->ma_used--;
+	di->di_used--;
+
+	ep->me_value = NULL;
+	ep->me_key = dummy;
+
+	Py_INCREF( dummy );
+	Py_INCREF( di );
+	
+	Py_DECREF( old_value );
+	Py_DECREF( old_key );
+	return (PyObject*)di;
+}
+
+
 static PyMethodDef dictiter_methods[] = {
 	{"__length_hint__", (PyCFunction)dictiter_len, METH_NOARGS, length_hint_doc},
+	{"delete",	(PyCFunction)dictiter_delete, METH_NOARGS, 
+	 dictiter_delete_doc },
+
 	{NULL,		NULL}		/* sentinel */
 };
 
@@ -2125,6 +2186,8 @@
 	return NULL;
 }
 
+
+
 PyTypeObject PyDictIterKey_Type = {
 	PyObject_HEAD_INIT(&PyType_Type)
 	0,					/* ob_size */
Index: Objects/listobject.c
===================================================================
--- Objects/listobject.c	(revision 43333)
+++ Objects/listobject.c	(working copy)
@@ -2695,6 +2695,7 @@
 typedef struct {
 	PyObject_HEAD
 	long it_index;
+ int delete_finish;
 	PyListObject *it_seq; /* Set to NULL when iterator is exhausted */
 } listiterobject;
 
@@ -2713,6 +2714,7 @@
 	if (it == NULL)
 		return NULL;
 	it->it_index = 0;
+	it->delete_finish = 0;
 	Py_INCREF(seq);
 	it->it_seq = (PyListObject *)seq;
 	_PyObject_GC_TRACK(it);
@@ -2735,7 +2737,47 @@
 	return visit((PyObject *)it->it_seq, arg);
 }
 
+
+PyDoc_STRVAR(listiter_delete_doc, 
+"Deletes the last next from the otherlying data store." );
+
+
 static PyObject *
+listiter_delete(listiterobject *it) 
+{
+	if ( it == NULL ) 
+		return NULL;
+
+	if ( it->delete_finish ) 
+	{
+		PyErr_SetString(PyExc_RuntimeError, 
+	 "iter.delete() called more than once per call to iter.next()" );
+		return NULL;
+	}
+
+	if ( it->it_index==0 )
+	{
+		PyErr_SetString( PyExc_RuntimeError, 
+		"iter.delete() called before first call to iter.next()");
+		return NULL;
+	}
+
+	if ( it->it_seq == NULL )
+	{
+		PyErr_SetString( PyExc_RuntimeError, 
+		"iter.delete() called after iteration exhausted." );
+		return NULL;
+	}
+	
+	it->delete_finish = -1;
+	list_ass_slice( it->it_seq, it->it_index-1, it->it_index, NULL );
+	
+	Py_INCREF( it );
+	return (PyObject*)it;
+}
+ 
+
+static PyObject *
 listiter_next(listiterobject *it)
 {
 	PyListObject *seq;
@@ -2749,7 +2791,8 @@
 
 	if (it->it_index < PyList_GET_SIZE(seq)) { item = PyList_GET_ITEM(seq, it->it_index);
-		++it->it_index;
+	it->it_index+=1+it->delete_finish;
+	it->delete_finish=0;
 		Py_INCREF(item);
 		return item;
 	}
@@ -2775,9 +2818,14 @@
 
 static PyMethodDef listiter_methods[] = {
 	{"__length_hint__", (PyCFunction)listiter_len, METH_NOARGS, length_hint_doc},
+	{"delete",	(PyCFunction)listiter_delete, METH_NOARGS, listiter_delete_doc},
+
 	{NULL,		NULL}		/* sentinel */
 };
 
+
+
+
 PyTypeObject PyListIter_Type = {
 	PyObject_HEAD_INIT(&PyType_Type)
 	0,					/* ob_size */
Index: Lib/test/test_dict.py
===================================================================
--- Lib/test/test_dict.py	(revision 43333)
+++ Lib/test/test_dict.py	(working copy)
@@ -445,6 +445,38 @@
 self.fail_("g[42] didn't raise KeyError")
 
 
+
+ def test_newiter( self ):
+ orig = dict( a='a', b='b', c='c', d='d', e='e' )
+ 
+ d = dict( orig )
+
+ i = d.iterkeys()
+ victim = i.next()
+ i.delete()
+ del( orig[ victim ] )
+
+ i = d.itervalues()
+ victim = i.next()
+ i.delete()
+ del( orig[ victim ] )
+
+ i = d.iteritems()
+ victim = i.next()[0]
+ i.delete()
+ del( orig[ victim ] )
+
+ self.assert_( d == orig )
+
+ 
+
+ 
+ 
+ 
+
+ 
+ 
+
 import mapping_tests
 
 class GeneralMappingTests(mapping_tests.BasicTestMappingProtocol):
Index: Lib/test/list_tests.py
===================================================================
--- Lib/test/list_tests.py	(revision 43333)
+++ Lib/test/list_tests.py	(working copy)
@@ -523,3 +523,21 @@
 def __len__(self):
 raise KeyboardInterrupt
 self.assertRaises(KeyboardInterrupt, list, F())
+
+
+ def test_iter( self ):
+
+ orig = list( "abcdef" )
+
+ l = list( orig )
+
+ i = iter( l )
+
+ victim = i.next()
+ i.delete()
+ orig.remove( victim )
+
+ self.assert_( orig == l )
+
+ 
+
 	 	 
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