On Fri, Sep 18, 2015 at 1:05 PM, Paul Ganssle <[email protected]> wrote:
> I haven't had time to read the PEP or the discussion on the matter, so > maybe this has already been considered, but would make for a simpler > interface if an unspecified value for fold left the old behavior intact. > Yes this have been considered and there is a section [1] on this in the PEP. TL;DR: There will be no way to spell "fold=unspecified." We decided to change the current disambiguation rule (default to STD) because it does not work for roll-back transitions that don't change isdst. Furthermore, this rule is only needed to make default fromutc() work, but post-PEP tzinfos will have to override that method anyways. [1]: https://www.python.org/dev/peps/pep-0495/#backward-compatibility
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