Hardly matters since 2.7.xx are all maintenance releases and practically no features or performance improvements
Which is exactly why it's ok and not unfair to compare the performance improvements over time of Python 3.6 versus Python 2.7?
Re:Learn Python 3 the Hard Way
by joshuamorton on Friday July 07, 2017 @07:23PM
(#14723017)
The point is that even at that time, Zed was advocating staying on py2 because py3 had no future, or wasn't turing complete, or whatever is complaint du jour was.
Not that the release date has much to do with the benchmark, mind you...