[GRASS-dev] obtain the progress percentage of a command run from python

[G. Allegri]

Thanks very much! ;)

giovanni

2011/12/1 Markus Neteler <neteler at osgeo.org>

> On Thu, Dec 1, 2011 at 7:57 AM, Glynn Clements <glynn at gclements.plus.com>
> wrote:
> ...
> > If you want to parse the output, set GRASS_MESSAGE_FORMAT=gui in the
> > environment when running the command and read from the command's
> > stderr; e.g.
> >
> >        import grass.script as grass
> >        env = os.environ.copy()
> >        env['GRASS_MESSAGE_FORMAT'] = 'gui'
> >        p = grass.start_command(..., stderr = grass.PIPE, env = env)
> >        # read from p.stderr
> >        p.wait()
> >
> > If you need to capture both stdout and stderr, you need to use
> > threads, select, or non-blocking I/O to consume data from both streams
> > as it is generated in order to avoid deadlock.
>
> Thanks, added to
>
> http://grass.osgeo.org/wiki/GRASS_and_Python#Percentage_output_for_progress_of_computation
>
> Markus
>
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