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Mon Dec 20 00:54:55 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-December/106903.html

On 12/19/2010 1:41 PM, Guido van Rossum wrote:
> On Sun, Dec 19, 2010 at 5:13 AM, Antoine Pitrou<solipsis at pitrou.net>  wrote:

>> This could be nicely resolved by renaming the arguments "a" and "b",
>> and having the diff display "a, b". It's quite natural (both the diff
>> ordering and the arguments ordering), and they are consistent with each
>> other.
>
> So 'a' stands for 'after' and 'b' for 'before', right? :-)

difflib uses 'a' and 'b' for before and after (orig,new in svn terms, 
with edits/diffs from a to b) respectively. Not really great. The docs 
then have to explain what 'a' and 'b' are and the implications for 
interpreting the output.

-- 
Terry Jan Reedy

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[Python-Dev] r87389 - in python/branches/py3k: Doc/library/unittest.rst Lib/unittest/case.py Misc/NEWS