[Datetime-SIG] PEP 495: What's left to resolve

Alexander Belopolsky alexander.belopolsky at gmail.com
Tue Sep 8 19:50:15 CEST 2015

On Tue, Sep 8, 2015 at 1:06 PM, Tim Peters <tim.peters at gmail.com> wrote:

> > I note that we can add obvious optimizations for the common tzinfo is
> > datetime.timezone.utc and  isinstance(tzinfo, datetime.timezone) cases.
> Please no.  Comparison is almost certainly almost always intrazone,
> and .utcoffset() isn't called at all for intrazone comparisons.

I don't understand this comment.  Solution 3 does not change anything for
the intrazone (self.tzinfo is other.tzinfo) comparisons.  Are you just
saying that a slowdown in interzone comparison is a welcome feature to
discourage bad programming practices?   Sorry, I have a few ideas on how to
optimize Solution 3  __eq__ even without special-casing fixed-offset
tzinfos. :-)
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