James Emerton added the comment:

Attached is an implementation of BufferedReader.readprevline(), as suggested by 
Antoine.

At this point, it seems to be working but I would like to improve the tests 
when a single result spans multiple chunks. I would particularly like to ensure 
correct behaviour when a newline ends up as the last byte of a new chunk.

----------
nosy: +jemerton
Added file: http://bugs.python.org/file34894/readprevline-20140415.diff

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