[GRASS-dev] using g.mapset in python script

[Markus Metz]

On Sun, Dec 24, 2017 at 3:10 PM, Paulo van Breugel <p.vanbreugel at gmail.com>
wrote:
>
> Hi devs,
>
> I am trying to create a new mapset and open that mapset using g.mapset.
When doing this from the command line, I can import layers in the new
mapset using r.in.gdal without problems.However, running this in a python
script doesn't work. E.g., when I run:
>
>
> gs.run_command("g.mapset", flags="c", mapset="LST",
location="latlon_clark66")
>
>
> Next, I try to import a layer:
>
>
> infile="lst_01.tif"
>
> outfile="lst_01"
>
> gs.run_command("r.in.gdal", input=infile, output=outfile)
>
> This gives me the error:
>
> gs.run_command("r.in.gdal", input="lst_01.tif", output="lst_01")
>
> Traceback (most recent call last):
>
>   File "<ipython-input-18-2c415e16d79f>", line 1, in <module>
>
>     gs.run_command("r.in.gdal", input="lst_01.tif", output="lst_01")
>
>   File "/usr/local/grass7/grass-7.5.svn/etc/python/grass/script/core.py",
line 421, in run_command
>
>     return handle_errors(returncode, returncode, args, kwargs)
>
>   File "/usr/local/grass7/grass-7.5.svn/etc/python/grass/script/core.py",
line 332, in handle_errors
>
>     returncode=returncode)
>
> CalledModuleError: Module run None ['r.in.gdal', 'input=lst_01.tif',
'output=lst_01'] ended with error
>
> Process ended with non-zero return code 1. See errors in the (error)
output.
>
>
> Any idea why this doesn't work?

It is a pity that the output to stderr is not available when a module is
called in python with gs.run_command() and the module fails. The python
traceback is in this case useless. Maybe handle_errors() [0] could be
improved to also provide the stderr output of the current module.

Markus M

[0]
https://trac.osgeo.org/grass/browser/grass/trunk/lib/python/script/core.py#L318
>
> Best wishes,
>
> Paulo
>
>
>
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