[Datetime-SIG] Timeline arithmetic?

[Alexander Belopolsky]

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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