[Python-ideas] datetime.timedelta literals

[Sebastian Kreft]

Please read the discussions on
*https://mail.python.org/pipermail//python-ideas/2016-August/041890.html
<https://mail.python.org/pipermail//python-ideas/2016-August/041890.html>*,
https://mail.python.org/pipermail//python-ideas/2016-August/041939.html,
https://mail.python.org/pipermail//python-ideas/2016-August/042028.html,
https://mail.python.org/pipermail//python-ideas/2016-August/041899.html

They are more general than your proposal but they still cover pitfalls that
may affect yours. It would be better if you could expand your proposal to
the concerns raised on those threads.

On Sun, Jun 3, 2018 at 12:53 PM, Pål Grønås Drange <paal.drange at gmail.com>
wrote:

> > What about
> >
> > 2.5*h - 14*min + 9300*ms * 2
>
> That doesn't seem feasible to implement, however, that is essentially how
> the
> Pint [1] module works:
>
> import pint
> u = pint.UnitRegistry()
> (2.5*u.hour - 14*u.min + 9300*u.ms) * 2
> #  <Quantity(4.5385, 'hour')>
>
> ((2.5*u.hour - 14*u.min + 9300*u.ms) * 2).to('sec')
> #  <Quantity(16338.6, 'second')>
>
> > However why be limited to time units ? One would want in certain
> > application to define other units, like meter ? Would we want a litteral
> > for that ?
>
> Pint works with all units imaginable:
>
> Q = u.Quantity
> Q(u.c, (u.m/u.s)).to('km / hour')
> #  <Quantity(3.6 speed_of_light, 'kilometer / hour')>
>
>
> However, the idea was just the six (h|min|s|ms|us|ns) time literals; I
> believe
> time units are used more often than other units, e.g. in constructs like
>
> while end - start < 1min:
>    poll()
>    sleep(1s)  # TypeError
>    sleep(1s.total_seconds())  # works, but ugly
>
>
> [1] https://pypi.org/project/Pint/
>
> Best regards,
> Pål Grønås Drange
>
> _______________________________________________
> Python-ideas mailing list
> Python-ideas at python.org
> https://mail.python.org/mailman/listinfo/python-ideas
> Code of Conduct: http://python.org/psf/codeofconduct/
>
>


-- 
Sebastian Kreft
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20180603/2672d2a3/attachment.html>