[GRASS-user] Returning values to Python

[Kevin Williams]

Thank you all!

Cheers, Kevin

On 30 October 2014 10:38, Pietro <peter.zamb at gmail.com> wrote:
> On Thu, Oct 30, 2014 at 8:04 AM, Glynn Clements
> <glynn at gclements.plus.com> wrote:
>>> One of the documentation pages mentioned a function "stdout2dict" from
>>> "grass.pygrass.modules", but it does not look like this is in the
>>> pygrass package any longer?
>>
>> If you use grass.script.raster_what(), it returns a list of
>> dictionaries.
>>
>> AFAICT, PyGRASS requires you to add stdout_=PIPE, then you can get the
>> output as a string from module.outputs["stdout"].value.
>
> or simplier: module.outputs.stdout
>
> or using directly the C API through python with:
>
> {{{
> from grass.pygrass.vector import VectorTopo
> from grass.pygrass.raster import RasterRow
> from grass.pygrass.gis.region import Region
>
> with RasterRow('elevation', mode='r') as rast:
>     with VectorTopo('hospitals', mode='r') as hospitals:
>         region = Region()
>         for hosp in hospitals:
>             value = rast.get_value(hosp, region)
>             if value is not None:
>                 print(hosp.cat, value)
> }}}
>
> Pietro