makes strftime('%s') portable. For symmetry, datetime.strptime(s, '%s') could be enabled to return local time as an aware (to avoid loosing info) datetime object for a given integer (seconds since the Epoch) timestamp string. I've uploaded a prototype patch with a draft implementation, docs, and tests.
With PEP 495, conversion from timestamp to naive datetime will no longer loose information. In light of this, I would like to reconsider what strftime('%s') should return in the absence of %z.
