[Datetime-SIG] PEP-431/495

[Alexander Belopolsky]

On Thu, Aug 27, 2015 at 2:32 PM, Tim Peters <tim.peters at gmail.com> wrote:

> [Tim]
> >> [...]
> >> Stewart, I still don't grasp what your problem is.  The only concrete
> >> example I've seen is dealing with this string:
> >>
> >>     2004-10-31 01:15 EST-05:00
> ..
>
[Tim]

>
> That's fine - I'm trying to get across the idea, not suggest a
> specific implementation, and 4 steps are one less than 5 ;-)
>

Dealing with simple time strings like this should really be one step:

>>> ts = '2004-10-31 01:15 EST-05:00'
>>> dt = datetime.strptime(ts.replace('EST', '').replace(':', ''),
'%Y-%m-%d %H%M %z')
>>> print(dt)
2004-10-31 01:15:00-05:00

It is unfortunate that we need to massage the input like this before
passing it to datetime.strptime().  Ideally,  datetime.strptime() should
have a way to at least parse -05:00 as a fixed offset timezone.

However, this problem has nothing to do with PEP 495.  Once you have the
UTC offset - there is no ambiguity.  The other 01:15 would be  "2004-10-31
01:15 -04:00." The EST part is redundant and is dropped explicitly in my
solution and not used in the solutions by Tim and Guido.
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