evolve: revision graph

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py3: use items() instead of iteritems()
Wed, 20 Apr 2016 19:00:13 +0000, by timeless
py3: change except from two comma to as notation
Wed, 20 Apr 2016 18:59:46 +0000, by timeless
py3: tolerate io/StringIO divergence
Wed, 20 Apr 2016 18:58:52 +0000, by timeless

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