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

[Luis Lisboa]

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

[Glynn Clements]

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 gl...@gclements.plus.com
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