[issue1677872] Efficient reverse line iterator

[Mark Russell]

Mark Russell added the comment:

Here's an updated version of the patch.  Changes:

    - Updated to work against current py3k branch (r59441)
    - Added support for universal newlines
    - Added unit tests
    - Added docs

The patch includes documentation for reversed() and __reversed__() (in the 
library and reference manuals respectively) which are independent of the 
reverse lines iterator - I can split those out to separate patch if needed.

I also updated the expected output from test_profile and test_cProfile, 
although I think a better fix would be to filter out the stdlib-related stuff 
from the expected output, as currently these tests break whenever io.py is 
changed.

Added file: http://bugs.python.org/file8902/reverse-file-iterator-20071209.diff

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