[GRASS-user] Multiple arguments in a grass.command- Python

GRASS GRASS user
1

Greetings

I have a script where I need to define a region based on 2 rasters output[0] and output[1].

I’m using thwe following expression:
grass.run_command(“g.region”, rast = output[2] output[3], res= t_srx)

But This is not correct. my question is how can I have both rasters without getting an error?
(I have tried also with
grass.run_command(“g.region”, rast = output[2],output[3], res= t_srx) and it didn’t workl

Thanks

Luis

2

Luis Lisboa wrote:

I have a script where I need to define a region based on 2 rasters output[0]
and output[1].

I'm using thwe following expression:
grass.run_command("g.region", rast = output[2] output[3], res= t_srx)

But This is not correct. my question is how can I have both rasters without
getting an error?
(I have tried also with
grass.run_command("g.region", rast = output[2],output[3], res= t_srx) and it
didn't workl

You can pass lists or tuples for options which accept multiple values,
e.g.:

  grass.run_command("g.region", rast = (output[2], output[3]), res= t_srx)
or:
  grass.run_command("g.region", rast = [output[2], output[3]], res= t_srx)
or:
  grass.run_command("g.region", rast = output[2:4], res= t_srx)

[The last one requires that "output" is a list or tuple and not e.g.
an array.]

For a tuple, you need the parentheses to prevent the comma from being
treated as an argument separator.

--
Glynn Clements <glynn@gclements.plus.com>