Terry J. Reedy <tjre...@udel.edu> added the comment:

Replacing string indexes with length-1 slices in the 2.x codebase, whether or 
not one one is running 2to3, seems to be a 'known' technique for Python3 
portability and unicode-bytes inter-operability. (It was discussed this week on 
py-dev list .) But I do not see it mentioned in PyWiki, such as on
http://wiki.python.org/moin/PortingPythonToPy3k

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nosy: +tjreedy

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