[Python-Dev] PEP 431 Time zone support improvements - Update

[Lennart Regebro]

On Sat, Dec 29, 2012 at 8:04 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:

> On Sat, 29 Dec 2012 19:56:43 +0100
> Lennart Regebro <regebro at gmail.com> wrote:
> > On Sat, Dec 29, 2012 at 7:54 PM, Lennart Regebro <regebro at gmail.com>
> wrote:
> >
> > > On Sat, Dec 29, 2012 at 7:38 PM, Tres Seaver <tseaver at palladion.com
> >wrote:
> > >
> > >> - -Lots for enabling fallback by default except on platforms known
> not to
> > >> have their own database
> > >
> > >
> > > Well, it's the same thing really. If the platform does have a database,
> > > the fallback will not be used.
> > > Of course, there is the case of the database existing on the platform
> > > normally, but somebody for some reason deleting the files, but I don't
> > > think that case deserves an error message.
> > >
> > > I also expect that most platform distributions, such as for Ubuntu,
> will
> > > not include the fallback database, as it will never be used. I'll add
> > > something about that and that we need to raise an error of some sort
> (any
> > > opinions on what?) if no database is found at all.
> > >
> >
> > Actually I already added that, but opinions on what error to raise are
> > still welcome. Currently it says:
> >
> >     If no database is found an ``UnknownTimeZoneError`` or subclass
> thereof
> > will
> >     be raised with a message explaining that no zoneinfo database can be
> > found,
> >     but that you can install one with the ``tzdata-update`` package.
>
> Why should we care about that situation if we *do* provide a database?
> Distributions can decide to exclude some files from their packages, but
> it's their problem, not ours.
>

Yes, but a comprehensible error message is useful even if somebody messed
up the system/configuration.

//Lennart
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