diff -r 736b0aec412b Modules/_elementtree.c
--- a/Modules/_elementtree.c	Thu Nov 24 22:00:46 2011 +0200
+++ b/Modules/_elementtree.c	Fri Nov 25 15:59:13 2011 +0100
@@ -3008,7 +3008,7 @@
 
         "class iterparse:\n"
         " root = None\n"
-        " def __init__(self, file, events=None):\n"
+        " def __init__(self, file, events=None, parser=None):\n"
         "  self._close_file = False\n"
         "  if not hasattr(file, 'read'):\n"
         "    file = open(file, 'rb')\n"
@@ -3018,8 +3018,11 @@
         "  self._index = 0\n"
         "  self._error = None\n"
         "  self.root = self._root = None\n"
-        "  b = cElementTree.TreeBuilder()\n"
-        "  self._parser = cElementTree.XMLParser(b)\n"
+        "  if not parser:\n"
+        "    b = cElementTree.TreeBuilder()\n"
+        "    self._parser = cElementTree.XMLParser(b)\n"
+        "  else:\n"
+        "    self._parser = parser\n"
         "  self._parser._setevents(self._events, events)\n"
         " def __next__(self):\n"
         "  while 1:\n"