On Fri, Aug 28, 2015 at 8:06 PM, Guido van Rossum <guido@python.org> wrote:

..

So, again, why have we been shy of adding this to the stdlib? We did (eventually) add the fixed offset classes.

I may be wrong, but I thought it was due to unresolvable DST fold issues that are mooted by PEP 495.  (At least that was the reason I did not push for LocalTimezone as hard as I did for the fixed offset class.)