Moved the encoding map building logic from the individual mapping
codec files to codecs.py and added logic so that multi mappings
in the decoding maps now result in mappings to None (undefined mapping)
in the encoding maps.
diff --git a/Lib/encodings/cp500.py b/Lib/encodings/cp500.py
index 1c8fb57..bc1acde 100644
--- a/Lib/encodings/cp500.py
+++ b/Lib/encodings/cp500.py
@@ -277,6 +277,4 @@
### Encoding Map
-encoding_map = {}
-for k,v in decoding_map.items():
- encoding_map[v] = k
+encoding_map = codecs.make_encoding_map(decoding_map)