[GRASS-user] Running Python scripts inside GRASS

Sonja Jankowfsky sonja.jankowfsky at cemagref.fr
Fri Mar 5 04:56:59 EST 2010

So, there is one good thing: I got to run my python program inside 
GRASS. However, I lost the python GUI. It's good that there is still the 
Tcl/Tk interface and QGIS ;-)

In detail:

Reducing the PYTHONPATH to C:\GRASS-4-SVN\etc\python changes nothing in 
the error message.

However, I had a look in my python installations 
(Python24,Python25,Python26 and GRASS-4-SVN/Python25) for collections.py 
and this is only included in Python26.

This explains also, why my python program runs under Eclipse, as I put 
Python26 into the Eclipse Path.

So, I changed the hole content of my C:\GRASS-4-SVN\Python25 directory 
with the content of the C:\Python26 directory. I kept the name 
(Python25) of the directory and the Scripts directory and sip.exe.

Now, I can run my Pythonprogramm under the GRASS windows command line, 
however I can no longer use the Pythonwx GUI. (which does not seem 
surprising due to the brutal changes I made ;-))

I don't know anything about the differences between Python25 and 
Python26 and the dependencies for the wxpython GUI, but in my opinion it 
would be necessary to update the WinGRASS installation with a Python26 
version while keeping the compability to the wxpython GUI, in order to 
be able to run the python scripts inside GRASS.

Does anybody know an easier solution?

Glynn Clements a écrit :

> Sonja Jankowfsky wrote:
>> I'm inside a GRASS session, with my Windows GRASS Command Line and I try 
>> to run a python script using GRASS functions:
>>   File "E:\pythoninput\test_simple.py", line 2, in <module>
>>     import grass.script as grass
>>   File "C:\GRASS-4-SVN\etc\python\grass\script\__init__.py", line 1, in 
>> <module>
>>     from core   import *
>>   File "C:\GRASS-4-SVN\etc\python\grass\script\core.py", line 30, in 
>> <module>
>>     import subprocess
>>   File "C:\GRASS-4-SVN\Python25\lib\subprocess.py", line 376, in <module>
>>     import threading
>>   File "C:\GRASS-4-SVN\Python25\lib\threading.py", line 13, in <module>
>>     from collections import deque
>> ImportError: No module named collections
>> Is this an error in the PYTHONPATH? And where can I define it inside GRASS?
> This indicates either a broken Python installation or broken
> configuration. The collections module should be present in 2.5 (it was
> added in 2.4).
> From your previous message, I note:
> C:\GRASS-4-SVN\etc;C:\GRASS-4-SVN\etc\python;C:\GRASS-4-SVN\lib;C:\GRASS-4-SVN\bin;C:\GRASS-4-SVN\extralib;C:\Python26;
> This is wrong. PYTHONPATH should be set to:
> 	C:\GRASS-4-SVN\etc\python
> It shouldn't contain any other directories. Python can find modules
> which are part of the Python distribution without any configuration;
> PYTHONPATH is only needed for the Python modules which are part of

Sonja Jankowfsky
UR Hydrologie-Hydraulique
Cemagref de Lyon
3 bis quai Chauveau CP 220
69336 Lyon Cedex 09
Tel : (+33)4 72 20 86 11 	 
Fax : (+33)4 78 47 78 75 

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