[GRASS-user] script in python

[Gabriele Nolè]

Hi Glynn.	
I use ubuntu 8.10 and grass64 svn
I made the changes based on your claims.
This is my code: 
-------------------------------------------------------------------------------------
def main():
	# con = assegno le variabili
	vect1 = options['vect_1']
	vect2 = options['vect_2']
	vect3 = options['vect_3']	

	grass.run_command('v.buffer', input = vect_1, output = buffer_200m, buffer
= 200)         

if __name__ == "__main__":
            options, flags = grass.parser()
            main()
---------------------------------------------------------------------------------------------
But  if __name__ == "__main__": etc      ...... what is your job? 

Unfortunately, I made several attempts, but I have an error: 
Traceback (most recent call last):
  File "/home/gab/scripts_grass/v.rischio_incendi.py", line
75, in <module>
    main()
  File "/home/gab/scripts_grass/v.rischio_incendi.py", line
70, in main
    grass.run_command('v.buffer', input = vect_1, output =
buffer_200m, buffer = 200)
NameError: global name 'vect_1' is not defined

I do not know how "to treat" the output of the v.buffer (in this case,
buffer_200m).

Thanks Glynn

Gabriele

PS
With grass 7 will work scripts in bash?



Glynn Clements wrote:
> 
> 
> Gabriele Nolè wrote:
> 
>> I'm trying to write a little script in python but I have difficulty (I
>> know
>> a bit the bash).
>> The script must first run a buffer and then some overlay.	
>> I am following the wiki and seeing some script as v.type.py,
>> color_table.py
>> etc. ..
>> Now I am at this point:
> 
>>     print "Value of GIS_OPT_vect_1: %s" % os.getenv("GIS_OPT_vect_1")
>>     print "Value of GIS_OPT_vect_2:  %s" % os.getenv("GIS_OPT_vect_2")
>>     print "Value of GIS_OPT_vect_3:    %s" % os.getenv("GIS_OPT_vect_3")
> 
>> if __name__ == "__main__":
>>     args = ""
>>     for arg in sys.argv:
>>         args += arg+" "
>>     try:
>>         if ( sys.argv[1] != "@ARGS_PARSED@" ):
>>             os.system("g.parser %s " % (args))
>>     except IndexError:
>>         os.system("g.parser %s" % (args))
>> 
>>     if sys.argv[1] == "@ARGS_PARSED@":
>>         main(); 
> 
> Look at the Python scripts in 7.0 for reference:
> 
> http://trac.osgeo.org/grass/browser/grass/trunk/scripts
> 
> Explicitly calling g.parser and reading GIS_OPT_* environment
> variables is no longer necessary (or desirable; g.parser may
> eventually be changed to use some other mechanism for passing data
> back to the script). Instead:
> 
> 	def main():
> 	    vect1 = options['vect_1']
> 	    vect2 = options['vect_2']
> 	    vect3 = options['vect_3']
> 	
> 	    ...
> 	
> 	if __name__ == "__main__":
> 	    options, flags = grass.parser()
> 	    main()
> 
>>     grass.run_command('v.buffer', input = vect_1 output = buffer_200m
>> buffer = 200)
> 
> You need commas between arguments, i.e.:
> 
>     grass.run_command('v.buffer', input = vect_1, output = buffer_200m,
> buffer = 200)
> 
>>    # or grass.exec_command ?
> 
> Usually not; exec_command will effectively terminate the script. Use
> run_command if you want control to return to the script once the
> command completes.
> 
> -- 
> Glynn Clements <glynn a gclements.plus.com>
> _______________________________________________
> grass-user mailing list
> grass-user a lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
> 
> 

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