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Wed Jun 6 00:33:28 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-June/119943.html

On Tue, Jun 5, 2012 at 6:07 PM, Guido van Rossum <guido at python.org> wrote:
>> I've also been arguing against "local time" tzinfo
>
> Why? I don't see your argumentation against such a tzinfo in the bug

See http://bugs.python.org/issue9063 .

The problem is again the DST ambiguity.  One day a year, datetime(y,
m, d, 1, 30, tzinfo=Local) represents two different times and another
day it represents no valid time.  Many applications can ignore this
problem but stdlib should not.

The documentation example (fixed in issue 9063) addresses the
ambiguity by defaulting to standard time, but it does this at a cost
of having no way to spell "the other hour."

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[Python-Dev] TZ-aware local time