Group,
I need help to run a python-grass script outside grass. I executed the following suggested program with the errors
line 1: import: command not found
/home/alassane/Programs/pythonGrass-example.py: line 2: import: command not found
/home/alassane/Programs/pythonGrass-example.py: line 3: import: command not found
/home/alassane/Programs/pythonGrass-example.py: line 6: syntax error near unexpected token (' /home/alassane/Programs/pythonGrass-example.py: line 6: gisdb = os.path.join(os.path.expanduser(“~”), “/home/alassane/'ata”)
Here is the code I copied in a file and named it grasspython.py
import os
import sys
import subprocess
define GRASS Database
add your path to grassdata (GRASS GIS database) directory
gisdb = os.path.join(os.path.expanduser(“~”), “/home/alassane/Data”)
the following path is the default path on MS Windows
gisdb = os.path.join(os.path.expanduser(“~”), “Documents/grassdata”)
specify (existing) Location and Mapset
location = “SanbornCD”
mapset = “PERMANENT”
path to the GRASS GIS launch script
we assume that the GRASS GIS start script is available and on PATH
query GRASS itself for its GISBASE
(with fixes for specific platforms)
needs to be edited by the user
grass7bin = ‘/usr/bin/grass70’
if sys.platform.startswith(‘win’):
MS Windows
grass7bin = r’C:\OSGeo4Win\grass70.bat’
uncomment when using standalone WinGRASS installer
grass7bin = r’C:\Program Files (x86)\GRASS GIS 7.0.0\grass70.bat’
this can be avoided if GRASS executable is added to PATH
elif sys.platform == ‘darwin’:
Mac OS X
TODO: this have to be checked, maybe unix way is good enough
grass7bin = ‘/Applications/GRASS/GRASS-7.0.app/’
query GRASS GIS itself for its GISBASE
startcmd = [grass7bin, ‘–config’, ‘path’]
try:
p = subprocess.Popen(startcmd, shell=False,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = p.communicate()
except OSError as error:
sys.exit(“ERROR: Cannot find GRASS GIS start script”
" {cmd}: {error}“.format(cmd=startcmd[0], error=error))
if p.returncode != 0:
sys.exit(“ERROR: Issues running GRASS GIS start script”
" {cmd}: {error}”
.format(cmd=’ '.join(startcmd), error=err))
gisbase = out.strip(os.linesep)
set GISBASE environment variable
os.environ[‘GISBASE’] = /usr/local/grass-7.0.1svn
define GRASS-Python environment
grass_pydir = os.path.join(gisbase, “etc”, “python”)
sys.path.append(grass_pydir)
import (some) GRASS Python bindings
import grass.script as gscript
launch session
rcfile = gscript.setup.init(gisbase, gisdb, location, mapset)
example calls
gscript.message(‘Current GRASS GIS 7 environment:’)
print gscript.gisenv()
gscript.message(‘Available raster maps:’)
for rast in gscript.list_strings(type=‘raster’):
print rast
gscript.message(‘Available vector maps:’)
for vect in gscript.list_strings(type=‘vector’):
print vect
delete the rcfile
os.remove(rcfile)
Obviously i am new with this and your help is appreciated.
Thanks
Alassane