putting date strings in order

[noydb]

On May 14, 4:13 pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> Peter Otten wrote:
> > Hm, if ordered_raster_list is guaranteed to contain one string item for
> > every month the above can be simplified to
>
> > months = [
> >     'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
> >     'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
> >     'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec']
>
> > start = 2
> > ordered_raster_list = months[start-1:] + months[:start-1]
>
> Or even:
>  >
>      multi_months = [
>          'precip_jan', 'precip_feb', 'precip_mar', 'precip_apr',
>          'precip_may', 'precip_jun', 'precip_jul', 'precip_aug',
>          'precip_sep', 'precip_oct', 'precip_nov', 'precip_dec'] * 2
>      start = 2
>      ordered_raster_list = multi_months[start - 1: start + 11]
>
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Peter and Scott --

ordered_raster_list is guaranteed to have one string item for all 12
months -- it is just NOT guaranteed to have those in chronological
order, which is what is required, whether the data starts in january
(thus ending in dec of same year) or august (thus ending in jul of the
following year) or whenever.  The initial order of the list is
dictated by when the raster (precip_<month>) was added to it's
container.  One would hope the rasters would be added in order, but I
cannot count on that and shouldn't.