diff --git a/Lib/keyword.py b/Lib/keyword.py
index c89708157f2..a0295e2139e 100755
--- a/Lib/keyword.py
+++ b/Lib/keyword.py
@@ -46,11 +46,7 @@ kwlist = [
 #--end keywords--
         ]
 
-kwdict = {}
-for keyword in kwlist:
-    kwdict[keyword] = 1
-
-iskeyword = kwdict.has_key
+iskeyword = frozenset(kwlist).__contains__
 
 def main():
     import sys, re