SF 563203. Replaced 'has_key()' with 'in'.
diff --git a/Lib/codecs.py b/Lib/codecs.py
index 293d5b7..9178db9 100644
--- a/Lib/codecs.py
+++ b/Lib/codecs.py
@@ -611,7 +611,7 @@
     """
     m = {}
     for k,v in decoding_map.items():
-        if not m.has_key(v):
+        if not v in m:
             m[v] = k
         else:
             m[v] = None