[issue1778443] robotparser.py fixes

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

These changes mostly look fine but shouldn't go it until after the 
beta.  This is really the wrong time in the release cycle to be making 
minor spacing changes and making it harder to get a meaningful "svn 
ann".

BTW, the first change should go the distance and use map() instead of a 
list comprehension:  
   lines = map(str.strip, f)

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nosy: +rhettinger
priority: normal -> low
versions: +Python 2.6 -Python 2.5

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