[GRASS-user] Can't use simple GRASS modules in python when not using ".py" in module call

[Cam Morlus]

Dear Stefan,

The GRASS version is 8.4.1. and the simple commands I used are the ones in
my previous email.
You helped me solve the problem; I had not added the addons and "C:\Program
Files\GRASS GIS 7.8\scripts" into the PATH variable. Now I did and it
solved the mistake.
Thank you very much!

Cheers,
Camille

Le ven. 15 janv. 2021 à 15:08, Stefan Blumentrath <
Stefan.Blumentrath at nina.no> a écrit :

> Dear Camille,
>
>
>
> I don`t get that error in GRASS 7.8.3 with your example.
>
>
>
> Can you post the exact command (if it was different from your example),
> and GRASS version as well as OS?
>
> Addons need to be on your PATH / ADDON_PATH.
>
>
>
> Cheers
>
> Stefan
>
>
>
>
>
> *From:* grass-user <grass-user-bounces at lists.osgeo.org> *On Behalf Of *Cam
> Morlus
> *Sent:* fredag 15. januar 2021 11:37
> *To:* grass-user at lists.osgeo.org
> *Subject:* [GRASS-user] Can't use simple GRASS modules in python when not
> using ".py" in module call
>
>
>
> Dear All,
>
>
> I am using grass 7.8.4. I'm trying to run some simple commands using the
> Grass Python Scripting Library in Python. For modules for which the source
> code is written in C or any other language than Python, it works without
> problem but for the modules written in Python it does not. Here is an
> example of a simple command I tried to run:
>
> import grass.script as gscript
> gscript.run_command("v.db.dropcolumn", flags="help")
>
>
> It raises the error:
>
> grass.exceptions.CalledModuleError: Module run None v.db.dropcolumn --help
> ended with error.
> Process ended with non-zero return code 9009
>
>
>
> I already checked and I know that return code 9009 means it does not find
> the python script. I solved the error by just adding ".py" in the command:
>
> gscript.run_command("v.db.dropcolumn.py
> <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fv.db.dropcolumn.py%2F&data=04%7C01%7C%7C6777bf389f194dc3954a08d8b941928a%7C6cef373021314901831055b3abf02c73%7C0%7C0%7C637463038877120044%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ra6Nu%2FwP%2BDmHIPxzKtlzwo%2FzLJuve01OwcqqXQweW7k%3D&reserved=0>",
> flags="help")
>
>
>
> I would like the command to work without the ".py" because I'm writing a
> python script that makes use of some addons. For the addons to work in my
> python script I sometimes need to modify them because there are running
> commands like "v.db.dropcolumn" without the ".py", so I have to add it. But
> then, the addons do not work anymore when I use them directly in the grass
> GUI. I tried to use pygrass and it also raises an error if I'm using
> Module("v.db.dropcolumn") instead of Module("v.db.dropcolumn.py
> <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fv.db.dropcolumn.py%2F&data=04%7C01%7C%7C6777bf389f194dc3954a08d8b941928a%7C6cef373021314901831055b3abf02c73%7C0%7C0%7C637463038877120044%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ra6Nu%2FwP%2BDmHIPxzKtlzwo%2FzLJuve01OwcqqXQweW7k%3D&reserved=0>
> ").
>
>
>
> Does anybody know how to solve this?
>
>
>
> Thank you in advance for the answer,
>
>
>
> Best,
>
>
>
> Camille Morlighem
>
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