use of properties

[Robert Collins]

Hi, 
	We seem to have some varied uses of properties. I'd like to draw
everyones attention to a recent PEP8 change, which is that properties
should not be used for anything that has non trivial performance
implications. (To me, this means anything that reads or writes from disk
should never be a property).

The thing that got me dropping this mail to the list is 'branch.nick'
which can potentially take many seconds on slow transports: a get and
set method is entirely appropriate here.

Rob

-- 
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