Don't add multiple empty lines at the end of the codec. With this a

regenerated codec should survive reindent.py unchanged.

Tools/unicode/gencodec.py

@@ -348,7 +348,7 @@ def getregentry():
     l.extend(encoding_map_code)
 
     # Final new-line
-    l.append('\n')
+    l.append('')
 
     return '\n'.join(l).expandtabs()