Allow access to ZopeIterator/PathIterator API from restricted Python

(e.g. python expressions)

lib/python/Products/PageTemplates/Expressions.py

@@ -152,6 +152,10 @@ class ZopeEngine(zope.app.pagetemplate.engine.ZopeEngine):
 
 class ZopeIterator(Iterator):
 
+    # allow iterator API to be accessed from (restricted) Python TALES
+    # expressions
+    __allow_access_to_unprotected_subobjects__ = True
+
     # The things below used to be attributes in
     # ZTUtils.Iterator.Iterator, however in zope.tales.tales.Iterator
     # they're methods.  We need BBB on the Python level so we redefine

lib/python/Products/PageTemplates/tests/testExpressions.py

@@ -69,6 +69,14 @@ class ExpressionTests(zope.component.testing.PlacelessSetup, unittest.TestCase):
         assert ec.evaluate('x | string:$one') == '1'
         assert ec.evaluate('x | not:exists:x')
 
+    def testIteratorZRPythonExpr(self):
+        '''Test access to iterator functions from Python expressions'''
+        ec = self.ec
+        ec.beginScope()
+        ec.setRepeat('loop', "python:[1,2,3]")
+        assert ec.evaluate("python:repeat['loop'].even()")
+        ec.endScope()
+
     def testWrappers(self):
         """Test if defer and lazy are returning their wrappers
         """