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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hm…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Did you initialize the session, e.g. like:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">with Session(gisdb="/tmp", location="location", create_opts="EPSG:4326"):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"> from grass.pygrass.vector import Vector<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> grass-user <grass-user-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Manuele Pesenti<br>
<b>Sent:</b> tirsdag 24. august 2021 09:38<br>
<b>To:</b> Grass User <grass-user@lists.osgeo.org><br>
<b>Subject:</b> Re: [GRASS-user] Error import from grass.pygrass.vector library<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Drear Stefan,<br>
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.<br>
<br>
Cheers<br>
<br>
Manuele<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">---- Attivato ven, 20 ago 2021 21:26:22 +0200
<b>Stefan Blumentrath <<a href="mailto:Stefan.Blumentrath@nina.no" target="_blank">Stefan.Blumentrath@nina.no</a>></b> ha scritto ----<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Dear Manuele,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">For ctypes in pygrass, the C-libraries need to be loaded explicitly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">You could have a look here:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><a href="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%7C5490515dd62a4bc57acf08d966d433e6%7C6cef373021314901831055b3abf02c73%7C0%7C0%7C637653884462405890%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=V0ecwomhbdvobU2B3tal1udBRXj5jkvWwN9e4K0dKSw%3D&reserved=0" target="_blank">https://github.com/zarch/grass-session/blob/6097f834be20ee0d703deb2af90f22d6dc66f368/grass_session/session.py#L332</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">to see how it can be done, or just use the grass_session python library (pip install grass-session) for convenience…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> grass-user <<a href="mailto:grass-user-bounces@lists.osgeo.org" target="_blank">grass-user-bounces@lists.osgeo.org</a>>
<b>On Behalf Of </b>Manuele Pesenti<br>
<b>Sent:</b> fredag 20. august 2021 16:40<br>
<b>To:</b> grass-user <<a href="mailto:grass-user@lists.osgeo.org" target="_blank">grass-user@lists.osgeo.org</a>><br>
<b>Subject:</b> [GRASS-user] Error import from grass.pygrass.vector library<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Dear All,</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">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.</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">I work on a Ubuntu/Linux environment and I've installed grass using apt, this is the test script I'm currently running:</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC"># -*- coding: utf-8 -*-</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">import os, sys</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">GISBASE = '/usr/lib/grass78'</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">GRASSBIN = '/usr/bin/grass78'</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC"># Define GRASS-Python environment</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">os.environ['GISBASE'] = GISBASE</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">os.environ['GRASSBIN'] = GRASSBIN</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">sys.path.append(os.path.join(GISBASE, "etc", "python"))</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">from grass_session import Session</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">import grass.script as gs</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">print(f"LD_LIBRARY_PATH: {os.environ['LD_LIBRARY_PATH']}")</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">print(f"GRASSBIN: {os.environ['GRASSBIN']}")</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">from grass.pygrass.vector import Vector</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#CCCCCC">print('DONE!')</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">and this is the output:</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New"">$ python import_test.py
</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New"">LD_LIBRARY_PATH: /usr/lib/grass78/lib</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New"">GRASSBIN: /usr/bin/grass78</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New"">Traceback (most recent call last):</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> File "/usr/lib/grass78/etc/python/grass/lib/ctypes_loader.py", line 76, in load</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> return ctypes.cdll.LoadLibrary(path)</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> File "/usr/lib/python3.9/ctypes/__init__.py", line 452, in LoadLibrary</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> return self._dlltype(name)</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> File "/usr/lib/python3.9/ctypes/__init__.py", line 374, in __init__</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> self._handle = _dlopen(self._name, mode)</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New"">OSError: libgrass_datetime.7.8.so: cannot open shared object file: No such file or directory</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New"">During handling of the above exception, another exception occurred:</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New"">Traceback (most recent call last):</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> File "/home/manuele/Lavoro/ETS/ETSCore/scripts/import_test.py", line 21, in <module></span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> from grass.pygrass.vector import Vector</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> File "/usr/lib/grass78/etc/python/grass/pygrass/vector/__init__.py", line 5, in <module></span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> import grass.lib.gis as libgis</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> File "/usr/lib/grass78/etc/python/grass/lib/gis.py", line 23, in <module></span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> _libs["grass_gis.7.8"] = load_library("grass_gis.7.8")</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> File "/usr/lib/grass78/etc/python/grass/lib/ctypes_loader.py", line 62, in load_library</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> return self.load(path)</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> File "/usr/lib/grass78/etc/python/grass/lib/ctypes_loader.py", line 78, in load</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New""> raise ImportError(e)</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Courier New";color:black;background:#FFCC99">ImportError: libgrass_datetime.7.8.so: cannot open shared object file: No such file or directory</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Thank you very mutch for any help</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Cheers</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> Manuele</span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="size"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span></span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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</blockquote>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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