[Datetime-SIG] Timeline arithmetic?

Alexander Belopolsky alexander.belopolsky at gmail.com
Sat Sep 5 00:02:17 CEST 2015

On Fri, Sep 4, 2015 at 5:54 PM, Carl Meyer <carl at oddbird.net> wrote:

> [Tim]
> > The term "timeline arithmetic" (aka "strict arithmetic") was also made
> > up on this mailing list, but isn't needed to describe anything Python
> > does.
> Not even the thing that Python does when you subtract two datetimes
> whose tzinfo differs?

No, because in this case there is no sensible alternative other than what
is implemented and making it an error.  The only case where two options
make sense is the t1 - t2 case where t1.tzinfo is t2.tzinfo.  In this
case "timeline arithmetic"  is not used, so it does not need a name.
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