# HG changeset patch
# User cmlenz
# Date 1184325038 0
# Node ID 80fb59bd2342bc2acf0106e5db9fea936d348784
# Parent  21f3c4bdd96496bbae60e59a1cb30e261c128e15
Built-in Python constants (such as `None`) in expressions are used directly instead of being looked up from the context.

diff --git a/genshi/template/eval.py b/genshi/template/eval.py
--- a/genshi/template/eval.py
+++ b/genshi/template/eval.py
@@ -390,7 +390,7 @@
 
 BUILTINS = __builtin__.__dict__.copy()
 BUILTINS.update({'Markup': Markup, 'Undefined': Undefined})
-
+CONSTANTS = frozenset(['False', 'True', 'None', 'NotImplemented', 'Ellipsis'])
 
 class ASTTransformer(object):
     """General purpose base class for AST transformations.
@@ -654,7 +654,7 @@
     """
 
     def __init__(self):
-        self.locals = []
+        self.locals = [CONSTANTS, set()]
 
     def visitConst(self, node):
         if isinstance(node.value, str):