Author tim.peters
Recipients aconrad, belopolsky, larry, mark.dickinson, python-dev, r.david.murray, tbarbugli, tim.peters, trcarden, vivanov, vstinner
Date 2015-09-04.17:35:08
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Message-id <1441388109.36.0.976663108602.issue23517@psf.upfronthosting.co.za>
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FYI, that invariant failed for me just now under the released 3.4.3 too:

Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:44:40) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from datetime import *
>>> E = datetime(1970,1,1,tzinfo=timezone.utc)
>>> s = -1/2**7
>>> datetime.fromtimestamp(s, timezone.utc)
datetime.datetime(1969, 12, 31, 23, 59, 59, 992187, tzinfo=datetime.timezone.utc)
>>> E + timedelta(seconds=s)
datetime.datetime(1969, 12, 31, 23, 59, 59, 992188, tzinfo=datetime.timezone.utc)

It's an exactly-tied rounding case for the exactly-representable-in-binary s = -0.0078125.
History
Date User Action Args
2015-09-04 17:35:09tim.peterssetrecipients: + tim.peters, mark.dickinson, belopolsky, vstinner, larry, r.david.murray, aconrad, vivanov, python-dev, tbarbugli, trcarden
2015-09-04 17:35:09tim.peterssetmessageid: <1441388109.36.0.976663108602.issue23517@psf.upfronthosting.co.za>
2015-09-04 17:35:09tim.peterslinkissue23517 messages
2015-09-04 17:35:08tim.peterscreate