Zachary Ware added the comment:

For the UTF-7 comment, I'd go with something like "locale encoding is probably 
not UTF-7" or "UTF-7 is a convenient, seldom used encoding", or something to 
that effect.

About writeTmp vs. context manager: as you wish.  It would still be good to 
convert writeTmp to use a context manager though, but that is a separate issue. 
 Just cleaning up 2.7 to match 3.x is enough to make me happy :)

For the explicit failure message, perhaps the best we can do in 2.7 is a 
comment saying that the most likely failure is a UnicodeDecodeError due to the 
entire file being read when it shouldn't have been.  That can be deduced from 
the separate comments you already have there (and especially from the issue 
link), but I think it may be better to just come right out and say it.  If 
exception chaining means the original exception is kept with a self.fail call 
in 3.x, I think 3.x should get the explicit failure message, though.  I don't 
feel too strongly about it, though; I'll leave it to you to change or not as 
you like :)

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<http://bugs.python.org/issue20501>
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