What version of grass_sessions do you use? I run grass_session 0.4 on Ubuntu 18.04 with GRASS 7.8 and your script works fine...
From: grass-user <[email protected]> On Behalf Of Manuele Pesenti Sent: tirsdag 24. august 2021 10:53 To: Grass User <[email protected]> Subject: Re: [GRASS-user] Error import from grass.pygrass.vector library ---- Attivato mar, 24 ago 2021 10:10:10 +0200 Stefan Blumentrath <[email protected]<mailto:[email protected]>> ha scritto ---- Hm... Did you initialize the session, e.g. like: with Session(gisdb="/tmp", location="location", create_opts="EPSG:4326"): from grass.pygrass.vector import Vector Yes it's exactly what I do, the strange fact is that I can by-pass the exception assigning the LD_LIBRARY_PATH value before running the script even if even now before importing vector lib this env variable has the correct value exactly thanks to the grass_session lib import... so the script modified as you suggested reported here under still raise the exception # -*- coding: utf-8 -*- import os, sys GISBASE = '/usr/lib/grass78' GRASSBIN = '/usr/bin/grass78' # Define GRASS-Python environment os.environ['GISBASE'] = GISBASE os.environ['GRASSBIN'] = GRASSBIN sys.path.append(os.path.join(GISBASE, "etc", "python")) from grass_session import Session import grass.script as gs print(f"LD_LIBRARY_PATH: {os.environ['LD_LIBRARY_PATH']}") print(f"GRASSBIN: {os.environ['GRASSBIN']}") with Session(gisdb="/tmp", location="location", create_opts="EPSG:4326"): from grass.pygrass.vector import Vector print('DONE!') while the old script (for convenience reported here under) runned as $ LD_LIBRARY_PATH=$(grass78 --config path)/lib python import_test.py LD_LIBRARY_PATH: /usr/lib/grass78/lib GRASSBIN: /usr/bin/grass78 DONE! returns just what printed in the script without raising the exception. # -*- coding: utf-8 -*- import os, sys GISBASE = '/usr/lib/grass78' GRASSBIN = '/usr/bin/grass78' # Define GRASS-Python environment os.environ['GISBASE'] = GISBASE os.environ['GRASSBIN'] = GRASSBIN sys.path.append(os.path.join(GISBASE, "etc", "python")) # from grass_session import Session import grass.script as gs print(f"LD_LIBRARY_PATH: {os.environ['LD_LIBRARY_PATH']}") print(f"GRASSBIN: {os.environ['GRASSBIN']}") # with Session(gisdb="/tmp", location="location", create_opts="EPSG:4326"): from grass.pygrass.vector import Vector print('DONE!') Cheers Manuele Cheers Stefan From: grass-user <[email protected]<mailto:[email protected]>> On Behalf Of Manuele Pesenti Sent: tirsdag 24. august 2021 09:38 To: Grass User <[email protected]<mailto:[email protected]>> Subject: Re: [GRASS-user] Error import from grass.pygrass.vector library Drear Stefan, thanks for your quick reply but the solution is not so clear, I already use grass_session library even if not reported in the attached example, how can it helps with the issue? Just import the vector library after the session is loaded does not solve as far as I've tested. Cheers Manuele ---- Attivato ven, 20 ago 2021 21:26:22 +0200 Stefan Blumentrath <[email protected]<mailto:[email protected]>> ha scritto ---- Dear Manuele, For ctypes in pygrass, the C-libraries need to be loaded explicitly. You could have a look here: https://github.com/zarch/grass-session/blob/6097f834be20ee0d703deb2af90f22d6dc66f368/grass_session/session.py#L332<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fzarch%2Fgrass-session%2Fblob%2F6097f834be20ee0d703deb2af90f22d6dc66f368%2Fgrass_session%2Fsession.py%23L332&data=04%7C01%7C%7C787f11b2fc5246a7da6d08d966dc9ee5%7C6cef373021314901831055b3abf02c73%7C0%7C0%7C637653920686707703%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=XA2vZhGMasSyLFE3KRrBPaXUjewtp2MNBzA4Dwfre9g%3D&reserved=0> to see how it can be done, or just use the grass_session python library (pip install grass-session) for convenience... Cheers Stefan From: grass-user <[email protected]<mailto:[email protected]>> On Behalf Of Manuele Pesenti Sent: fredag 20. august 2021 16:40 To: grass-user <[email protected]<mailto:[email protected]>> Subject: [GRASS-user] Error import from grass.pygrass.vector library Dear All, I'm moving my first steps on the development of a python script that uses Grass, but I cannot import from the grass.pygrass.vector library. I work on a Ubuntu/Linux environment and I've installed grass using apt, this is the test script I'm currently running: # -*- coding: utf-8 -*- import os, sys GISBASE = '/usr/lib/grass78' GRASSBIN = '/usr/bin/grass78' # Define GRASS-Python environment os.environ['GISBASE'] = GISBASE os.environ['GRASSBIN'] = GRASSBIN sys.path.append(os.path.join(GISBASE, "etc", "python")) from grass_session import Session import grass.script as gs print(f"LD_LIBRARY_PATH: {os.environ['LD_LIBRARY_PATH']}") print(f"GRASSBIN: {os.environ['GRASSBIN']}") from grass.pygrass.vector import Vector print('DONE!') and this is the output: $ python import_test.py LD_LIBRARY_PATH: /usr/lib/grass78/lib GRASSBIN: /usr/bin/grass78 Traceback (most recent call last): File "/usr/lib/grass78/etc/python/grass/lib/ctypes_loader.py", line 76, in load return ctypes.cdll.LoadLibrary(path) File "/usr/lib/python3.9/ctypes/__init__.py", line 452, in LoadLibrary return self._dlltype(name) File "/usr/lib/python3.9/ctypes/__init__.py", line 374, in __init__ self._handle = _dlopen(self._name, mode) OSError: libgrass_datetime.7.8.so: cannot open shared object file: No such file or directory During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/manuele/Lavoro/ETS/ETSCore/scripts/import_test.py", line 21, in <module> from grass.pygrass.vector import Vector File "/usr/lib/grass78/etc/python/grass/pygrass/vector/__init__.py", line 5, in <module> import grass.lib.gis as libgis File "/usr/lib/grass78/etc/python/grass/lib/gis.py", line 23, in <module> _libs["grass_gis.7.8"] = load_library("grass_gis.7.8") File "/usr/lib/grass78/etc/python/grass/lib/ctypes_loader.py", line 62, in load_library return self.load(path) File "/usr/lib/grass78/etc/python/grass/lib/ctypes_loader.py", line 78, in load raise ImportError(e) ImportError: libgrass_datetime.7.8.so: cannot open shared object file: No such file or directory Thank you very mutch for any help Cheers Manuele
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