[GRASS-user] Install package for add-on in /usr/bin/python3

Robin_Kohrs · March 21, 2020, 5:06pm

Hi everyone:)
I'm really sorry for this naive question. I'm kind of starting with GRASS and I just can't find a solution...
The issue is, that I would like to try to write a little GRASS Add-on and use the python-fmask package. While this package is only downloadable via conda it always installs into `/home/user/miniconda3/bin/python3`. Even when I did `conda deactivate` prior to this.

When I then have the import statement `import fask` in the grass-script it always throws an error, saying that fmask is not installed. When I print the `sys.executable` in the grass-script it tells me that the interpreter is in `usr/bin/python3`. So I thought that I'd install the fmask-package in a way that this interpreter can find it while executing the script. But I just don't know how. I can add the fmask-path to sys.path, but I don't think this is the solution. Maybe someone has a pointer what I'm not getting.

Hope everyone is good these days:)!
Thank you very much in advance,
Robin

neteler · March 23, 2020, 1:31pm

Hi Robin,

On Sat, Mar 21, 2020 at 6:15 PM Robin Kohrs <robin.kohrs@uni-jena.de> wrote:

Hi everyone:)
I'm really sorry for this naive question. I'm kind of starting with
GRASS and I just can't find a solution...
The issue is, that I would like to try to write a little GRASS Add-on
and use the python-fmask package. While this package is only
downloadable via conda it always installs into
`/home/user/miniconda3/bin/python3`. Even when I did `conda
deactivate` prior to this.

I guess that mixing conda packages and "regular" ones is causing troubles.

When I then have the import statement `import fask` in the
grass-script it always throws an error, saying that fmask is not
installed. When I print the `sys.executable` in the grass-script it
tells me that the interpreter is in `usr/bin/python3`. So I thought
that I'd install the fmask-package in a way that this interpreter can
find it while executing the script. But I just don't know how. I can
add the fmask-path to sys.path, but I don't think this is the
solution. Maybe someone has a pointer what I'm not getting.

There is also the environment variable PYTHONPATH which could be set
in the session.
But again, mixing might cause problems.

Now I wanted to check
http://pythonfmask.org/en/latest/#downloads
but the server is down...

Hope everyone is good these days:)!

Good luck everyone,

Markus

Robin_Kohrs · March 31, 2020, 7:25am

Hi Markus,

thank you very much for your answer and the help!
Do you have any idea what I could do to make the fmask-package "locatable" for the python-interpreter that grass is using?

I tried the following options, but I guess I just don't know sufficiently about how python and grass really work together:

My python-script looks more or less like this:
---------------------------------------
#!/usr/bin/env python3

import sys

print("SYS PATH")
print(sys.path)
print("")
print("SYS EXECUTABLE")
print(sys.executable)

import grass.script as grass
from rios import fileinfo # that's where it fails
from fmask import fmask

---------------------------------------

That's why I tried until now:

- I created an environment with conda and installed python-fmask via "conda install -c conda-forge python-fmask". The function "fmask_sentinel2Stacked.py" lies in "/home/robin/miniconda3/bin/fmask_sentinel2Stacked.py".

- When I open an interactive python-shell and import fmask and rios and the type: "fmask.__file__" it gives me "/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/fmask/__init__.py"

- I then added "/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/" to the variable PYTHONPATH in my .bashrc

- When I now start the interpreter that grass uses from the command line by typing "/usr/bin/pyton3" I can import fmask and rios

- However when I run the script with grass it always says that there is no package names rios. Moreover the path I added to PYTHONPATH is not printed when it executes "sys.path" in my grass script

I'm sorry for this little confusing question. But in case someone has any idea how I could make grass find fmask, would be super highly appreciated:)

thanks a lot in advance! Cheers
Robin

Citando Markus Neteler <neteler@osgeo.org>:

Hi Robin,

On Sat, Mar 21, 2020 at 6:15 PM Robin Kohrs <robin.kohrs@uni-jena.de> wrote:

Hi everyone:)
I'm really sorry for this naive question. I'm kind of starting with
GRASS and I just can't find a solution...
The issue is, that I would like to try to write a little GRASS Add-on
and use the python-fmask package. While this package is only
downloadable via conda it always installs into
`/home/user/miniconda3/bin/python3`. Even when I did `conda
deactivate` prior to this.

I guess that mixing conda packages and "regular" ones is causing troubles.

When I then have the import statement `import fask` in the
grass-script it always throws an error, saying that fmask is not
installed. When I print the `sys.executable` in the grass-script it
tells me that the interpreter is in `usr/bin/python3`. So I thought
that I'd install the fmask-package in a way that this interpreter can
find it while executing the script. But I just don't know how. I can
add the fmask-path to sys.path, but I don't think this is the
solution. Maybe someone has a pointer what I'm not getting.

There is also the environment variable PYTHONPATH which could be set
in the session.
But again, mixing might cause problems.

Now I wanted to check
http://pythonfmask.org/en/latest/#downloads
but the server is down...

Hope everyone is good these days:)!

Good luck everyone,

Markus

Blumentrath_Stefan1 · March 31, 2020, 10:13am

Hi Robin,

You could try setting the GRASS_PYTHON environment variable to your Python installation with fmask.

import os
os.environ['GRASS_PYTHON'] = '/YOUR/PYTHON/PATH'

As Markus indicates that can cause other issues.

You may also have a look at https://github.com/zarch/grass-session for inspiration.

Hope that gives you at least a lead...

Cheers
Stefan

-----Original Message-----
From: grass-user <grass-user-bounces@lists.osgeo.org> On Behalf Of Robin Kohrs
Sent: tirsdag 31. mars 2020 09:25
To: Markus Neteler <neteler@osgeo.org>
Cc: GRASS user list <grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] Install package for add-on in /usr/bin/python3

Hi Markus,

thank you very much for your answer and the help!
Do you have any idea what I could do to make the fmask-package "locatable" for the python-interpreter that grass is using?

I tried the following options, but I guess I just don't know sufficiently about how python and grass really work together:

My python-script looks more or less like this:
---------------------------------------
#!/usr/bin/env python3

import sys

print("SYS PATH")
print(sys.path)
print("")
print("SYS EXECUTABLE")
print(sys.executable)

import grass.script as grass
from rios import fileinfo # that's where it fails from fmask import fmask

---------------------------------------

That's why I tried until now:

- I created an environment with conda and installed python-fmask via "conda install -c conda-forge python-fmask". The function "fmask_sentinel2Stacked.py" lies in "/home/robin/miniconda3/bin/fmask_sentinel2Stacked.py".

- When I open an interactive python-shell and import fmask and rios and the type: "fmask.__file__" it gives me "/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/fmask/__init__.py"

- I then added
"/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/" to the variable PYTHONPATH in my .bashrc

- When I now start the interpreter that grass uses from the command line by typing "/usr/bin/pyton3" I can import fmask and rios

- However when I run the script with grass it always says that there is no package names rios. Moreover the path I added to PYTHONPATH is not printed when it executes "sys.path" in my grass script

I'm sorry for this little confusing question. But in case someone has any idea how I could make grass find fmask, would be super highly
appreciated:)

thanks a lot in advance! Cheers
Robin

Citando Markus Neteler <neteler@osgeo.org>:

Hi Robin,

On Sat, Mar 21, 2020 at 6:15 PM Robin Kohrs <robin.kohrs@uni-jena.de> wrote:

Hi everyone:)
I'm really sorry for this naive question. I'm kind of starting with
GRASS and I just can't find a solution...
The issue is, that I would like to try to write a little GRASS Add-on
and use the python-fmask package. While this package is only
downloadable via conda it always installs into
`/home/user/miniconda3/bin/python3`. Even when I did `conda
deactivate` prior to this.

I guess that mixing conda packages and "regular" ones is causing troubles.

When I then have the import statement `import fask` in the
grass-script it always throws an error, saying that fmask is not
installed. When I print the `sys.executable` in the grass-script it
tells me that the interpreter is in `usr/bin/python3`. So I thought
that I'd install the fmask-package in a way that this interpreter can
find it while executing the script. But I just don't know how. I can
add the fmask-path to sys.path, but I don't think this is the
solution. Maybe someone has a pointer what I'm not getting.

There is also the environment variable PYTHONPATH which could be set
in the session.
But again, mixing might cause problems.

Now I wanted to check
http://pythonfmask.org/en/latest/#downloads
but the server is down...

Hope everyone is good these days:)!

Good luck everyone,

Markus

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

Robin_Kohrs · March 31, 2020, 1:42pm

Hi Stefan,

thank you very much for the effort and the patience in answering!
I'll definitely give this a try. I already have so many issues on my computer, one more doesn't matter;)

thanks again and best regards,
Robin

Citando Stefan Blumentrath <Stefan.Blumentrath@nina.no>:

Hi Robin,

You could try setting the GRASS_PYTHON environment variable to your Python installation with fmask.

import os
os.environ['GRASS_PYTHON'] = '/YOUR/PYTHON/PATH'

As Markus indicates that can cause other issues.

You may also have a look at https://github.com/zarch/grass-session for inspiration.

Hope that gives you at least a lead...

Cheers
Stefan

-----Original Message-----
From: grass-user <grass-user-bounces@lists.osgeo.org> On Behalf Of Robin Kohrs
Sent: tirsdag 31. mars 2020 09:25
To: Markus Neteler <neteler@osgeo.org>
Cc: GRASS user list <grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] Install package for add-on in /usr/bin/python3

Hi Markus,

thank you very much for your answer and the help!
Do you have any idea what I could do to make the fmask-package "locatable" for the python-interpreter that grass is using?

I tried the following options, but I guess I just don't know sufficiently about how python and grass really work together:

My python-script looks more or less like this:
---------------------------------------
#!/usr/bin/env python3

import sys

print("SYS PATH")
print(sys.path)
print("")
print("SYS EXECUTABLE")
print(sys.executable)

import grass.script as grass
from rios import fileinfo # that's where it fails from fmask import fmask

---------------------------------------

That's why I tried until now:

- I created an environment with conda and installed python-fmask via "conda install -c conda-forge python-fmask". The function "fmask_sentinel2Stacked.py" lies in "/home/robin/miniconda3/bin/fmask_sentinel2Stacked.py".

- When I open an interactive python-shell and import fmask and rios and the type: "fmask.__file__" it gives me "/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/fmask/__init__.py"

- I then added
"/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/" to the variable PYTHONPATH in my .bashrc

- When I now start the interpreter that grass uses from the command line by typing "/usr/bin/pyton3" I can import fmask and rios

- However when I run the script with grass it always says that there is no package names rios. Moreover the path I added to PYTHONPATH is not printed when it executes "sys.path" in my grass script

I'm sorry for this little confusing question. But in case someone has any idea how I could make grass find fmask, would be super highly
appreciated:)

thanks a lot in advance! Cheers
Robin

Citando Markus Neteler <neteler@osgeo.org>:

Hi Robin,

On Sat, Mar 21, 2020 at 6:15 PM Robin Kohrs <robin.kohrs@uni-jena.de> wrote:

Hi everyone:)
I'm really sorry for this naive question. I'm kind of starting with
GRASS and I just can't find a solution...
The issue is, that I would like to try to write a little GRASS Add-on
and use the python-fmask package. While this package is only
downloadable via conda it always installs into
`/home/user/miniconda3/bin/python3`. Even when I did `conda
deactivate` prior to this.

I guess that mixing conda packages and "regular" ones is causing troubles.

When I then have the import statement `import fask` in the
grass-script it always throws an error, saying that fmask is not
installed. When I print the `sys.executable` in the grass-script it
tells me that the interpreter is in `usr/bin/python3`. So I thought
that I'd install the fmask-package in a way that this interpreter can
find it while executing the script. But I just don't know how. I can
add the fmask-path to sys.path, but I don't think this is the
solution. Maybe someone has a pointer what I'm not getting.

There is also the environment variable PYTHONPATH which could be set
in the session.
But again, mixing might cause problems.

Now I wanted to check
http://pythonfmask.org/en/latest/#downloads
but the server is down...

Hope everyone is good these days:)!

Good luck everyone,

Markus

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

Blumentrath_Stefan1 · April 4, 2020, 6:56pm

Hi Robin,

The errors you encountered after setting the python path, occurred because fmask depends on another, non-standard Python package, namely rios (that would have to be added to the PYTHONPATH as well).

Yet, it seems there is some more interest in getting python-fmask (and thus also RIOS) available as a standard python package. See: https://github.com/ubarsc/python-fmask/issues/30
So, your problem might get solved "upstreams".

Meanwhile you could install both packages manually into your standard Python installation as follows:

wget https://github.com/ubarsc/rios/releases/download/rios-1.4.10/rios-1.4.10.zip
unzip rios-1.4.10.zip
cd rios-1.4.10/
sudo python setup.py install
cd ..

wget https://github.com/ubarsc/python-fmask/releases/download/pythonfmask-0.5.4/python-fmask-0.5.4.zip
unzip -q python-fmask-0.5.4.zip
cd python-fmask-0.5.4/
python setup.py build
sudo python setup.py install

For me (on Ubuntu 18.04) this gives:

$ ipython
Python 3.6.8 (default, Oct 7 2019, 12:59:55)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.13.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import fmask

In [2]: fmask.__version__
Out[2]: '0.5.4'

In [3]: import rios

In [4]: rios.__version__
Out[4]: '1.4.10'

Cheers
Stefan

-----Original Message-----
From: Robin Kohrs <robin.kohrs@uni-jena.de>
Sent: tirsdag 31. mars 2020 15:42
To: Stefan Blumentrath <Stefan.Blumentrath@nina.no>
Cc: Markus Neteler <neteler@osgeo.org>; GRASS user list <grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] Install package for add-on in /usr/bin/python3

Hi Stefan,

thank you very much for the effort and the patience in answering!
I'll definitely give this a try. I already have so many issues on my computer, one more doesn't matter;)

thanks again and best regards,
Robin

Citando Stefan Blumentrath <Stefan.Blumentrath@nina.no>:

Hi Robin,

You could try setting the GRASS_PYTHON environment variable to your
Python installation with fmask.

import os
os.environ['GRASS_PYTHON'] = '/YOUR/PYTHON/PATH'

As Markus indicates that can cause other issues.

You may also have a look at https://github.com/zarch/grass-session
for inspiration.

Hope that gives you at least a lead...

Cheers
Stefan

-----Original Message-----
From: grass-user <grass-user-bounces@lists.osgeo.org> On Behalf Of
Robin Kohrs
Sent: tirsdag 31. mars 2020 09:25
To: Markus Neteler <neteler@osgeo.org>
Cc: GRASS user list <grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] Install package for add-on in
/usr/bin/python3

Hi Markus,

thank you very much for your answer and the help!
Do you have any idea what I could do to make the fmask-package
"locatable" for the python-interpreter that grass is using?

I tried the following options, but I guess I just don't know
sufficiently about how python and grass really work together:

My python-script looks more or less like this:
---------------------------------------
#!/usr/bin/env python3

import sys

print("SYS PATH")
print(sys.path)
print("")
print("SYS EXECUTABLE")
print(sys.executable)

import grass.script as grass
from rios import fileinfo # that's where it fails from fmask import
fmask

---------------------------------------

That's why I tried until now:

- I created an environment with conda and installed python-fmask via
"conda install -c conda-forge python-fmask". The function
"fmask_sentinel2Stacked.py" lies in
"/home/robin/miniconda3/bin/fmask_sentinel2Stacked.py".

- When I open an interactive python-shell and import fmask and rios
and the type: "fmask.__file__" it gives me
"/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/fmask/__init__.py"

- I then added
"/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/" to
the variable PYTHONPATH in my .bashrc

- When I now start the interpreter that grass uses from the command
line by typing "/usr/bin/pyton3" I can import fmask and rios

- However when I run the script with grass it always says that there
is no package names rios. Moreover the path I added to PYTHONPATH is
not printed when it executes "sys.path" in my grass script

I'm sorry for this little confusing question. But in case someone
has any idea how I could make grass find fmask, would be super highly
appreciated:)

thanks a lot in advance! Cheers
Robin

Citando Markus Neteler <neteler@osgeo.org>:

Hi Robin,

On Sat, Mar 21, 2020 at 6:15 PM Robin Kohrs <robin.kohrs@uni-jena.de> wrote:

Hi everyone:)
I'm really sorry for this naive question. I'm kind of starting with
GRASS and I just can't find a solution...
The issue is, that I would like to try to write a little GRASS Add-on
and use the python-fmask package. While this package is only
downloadable via conda it always installs into
`/home/user/miniconda3/bin/python3`. Even when I did `conda
deactivate` prior to this.

I guess that mixing conda packages and "regular" ones is causing troubles.

When I then have the import statement `import fask` in the
grass-script it always throws an error, saying that fmask is not
installed. When I print the `sys.executable` in the grass-script it
tells me that the interpreter is in `usr/bin/python3`. So I thought
that I'd install the fmask-package in a way that this interpreter can
find it while executing the script. But I just don't know how. I can
add the fmask-path to sys.path, but I don't think this is the
solution. Maybe someone has a pointer what I'm not getting.

There is also the environment variable PYTHONPATH which could be set
in the session.
But again, mixing might cause problems.

Now I wanted to check
http://pythonfmask.org/en/latest/#downloads
but the server is down...

Hope everyone is good these days:)!

Good luck everyone,

Markus

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

Blumentrath_Stefan1 · April 8, 2020, 11:33am

Hi Robin,

After installing from python-fmask source as described I got the same error message as you did on:

from fmask import fmask

(just importing fmask worked also before).

The problem seems to be that fmask (including it`s C components) gets installed in /usr/local/. See:

https://github.com/ubarsc/python-fmask/issues/19

You can fix that by specifying /usr as a prefix during install:

sudo python3 setup.py install --prefix=/usr

(note that I also had to specifically call setup.py with python3 which was an error in my initial installation script.)

When python-fmask gets available on PyPi, I guess this will be taken care of…

If you set the PYTHONPATH environment variable before starting GRASS GIS, GRASS should temporarily add the path to the GRASS python libs (but nothing more). If you use a prepackaged GRASS installation, it is compiled against a specific Python version (usually system Python). You can see which Python installation GRASS is using by typing:

echo $GRASS_PYTHON

So, if you want to use your conda Python in GRASS (despite possible issues other places), my understanding is that you would need to point GRASS_PYTHON variable to conda python. However, with the installation described above, GRASS should find fmask and _fillminima from fmask… In the long run, this will be the most convenient solution for an addon. For the time being, the installation procedure could be added to the manual as a note (and probably as an error message if import fails), until it becomes available on PyPi.

Hope that helps.

Cheers

Stefan

···

From: robin robin.kohrs@uni-jena.de
Sent: søndag 5. april 2020 19:13
To: Stefan Blumentrath Stefan.Blumentrath@nina.no
Subject: Re: [GRASS-user] Install package for add-on in /usr/bin/python3

Hi Stefan,

thank you very much!! Why does my PYTHONPATH needs to point to the system-python? So the issue is, that I would like to have a script that I can run from within GRASS with launch user-defined script. I created a conda environment (“spatial”) and installed python-fmask with:

conda install -c conda-forge python-fmask

This automativally installes python3.8.2, fmask and rios in:

home/robin/miniconda3/envs/spatial/lib/python3.8/site-packages/

I then added this path in my .bashrc (I thought I needed to put it in the .profile, but this didn’t work for some reason) my PYTHONPATH with:

export PYTHONPATH=/home/robin/miniconda3/envs/spatial/lib/python3.8/site-packages

I then did a source .bashrc and when printing the PYTHONPATH with

echo $PYTHONPATH it prints

/home/robin/miniconda3/envs/spatial/lib/python3.8/site-packages

I then made a little test script where I wanted to test if the fmask-import and rios-import works
from within GRASS

  1 #! /usr/bin/env python3

  3 import sys

  4 import os

  6 for i in sys.path:

  7     print(i)

  9 print("PYTHONPATH")

 10 print(os.environ["PYTHONPATH"])

 12 import fmask

 13 import rios

 13 import rios

When importing this script in GRASS with the “launch user-defined script”-option, the output is:

/home/robin/Desktop

/usr/lib/grass78/etc/python

/usr/lib/python36.zip

/usr/lib/python3.6

/usr/lib/python3.6/lib-dynload

/home/robin/.local/lib/python3.6/site-packages

/usr/local/lib/python3.6/dist-packages

/usr/lib/python3/dist-packages

PYTHONPATH

/usr/lib/grass78/etc/python

Traceback (most recent call last):

  File "/home/robin/Desktop/test.py", line 12, in <module>

    import fmask

ModuleNotFoundError: No module named 'fmask'

I don’t know why the PYTHONPATH is different when run from GRASS. Probably I’m just not understanding something really basic. If so I’m really sorry. It’s just a little frustrating to spend so much time in something so basic.

Anyways: Thanks so much for the help!
Cheers,
Robin

On 05.04.2020 14:35, Stefan Blumentrath wrote:

Did you check that your pythonpath again points to system python. And can you share your code, esp. the imports. That would simplify testing…

Sent from Outlook Mobile

From: robin kohrs robin.kohrs@uni-jena.de
Sent: Sunday, April 5, 2020 11:04:02 AM
To: Stefan Blumentrath Stefan.Blumentrath@nina.no
Subject: Re: [GRASS-user] Install package for add-on in /usr/bin/python3

Hi Stefan,

thank you very much for the answer! That would be great if it’d become a
standard python package!
I managed to install everything as you explained it. But when I run:

In [1]: from fmask import fmask

I still get

ModuleNotFoundError: No module named ‘rios’

I guess this is, because they are still in seperate folders right?
When I copy everything from the installed rios into fmask (I know this
seems really wrong…) and then do :

In [2]: from fmask import fmask

ImportError: cannot import name ‘_fillminima’

I’m sorry for these basic questions, but I just can’t find a solution:/

cheers and thanks a lot!!
Robin

On 04.04.20 20:56, Stefan Blumentrath wrote:

Hi Robin,

The errors you encountered after setting the python path, occurred because fmask depends on another, non-standard Python package, namely rios (that would have to be added to the PYTHONPATH as well).

Yet, it seems there is some more interest in getting python-fmask (and thus also RIOS) available as a standard python package. See: https://github.com/ubarsc/python-fmask/issues/30
So, your problem might get solved “upstreams”.

Meanwhile you could install both packages manually into your standard Python installation as follows:

wget https://github.com/ubarsc/rios/releases/download/rios-1.4.10/rios-1.4.10.zip
unzip rios-1.4.10.zip
cd rios-1.4.10/
sudo python setup.py install
cd …

wget https://github.com/ubarsc/python-fmask/releases/download/pythonfmask-0.5.4/python-fmask-0.5.4.zip
unzip -q python-fmask-0.5.4.zip
cd python-fmask-0.5.4/
python setup.py build
sudo python setup.py install

For me (on Ubuntu 18.04) this gives:

$ ipython
Python 3.6.8 (default, Oct 7 2019, 12:59:55)
Type ‘copyright’, ‘credits’ or ‘license’ for more information
IPython 7.13.0 – An enhanced Interactive Python. Type ‘?’ for help.

In [1]: import fmask

In [2]: fmask.version
Out[2]: ‘0.5.4’

In [3]: import rios

In [4]: rios.version
Out[4]: ‘1.4.10’

Cheers
Stefan

-----Original Message-----
From: Robin Kohrs robin.kohrs@uni-jena.de
Sent: tirsdag 31. mars 2020 15:42
To: Stefan Blumentrath Stefan.Blumentrath@nina.no
Cc: Markus Neteler neteler@osgeo.org; GRASS user list grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] Install package for add-on in /usr/bin/python3

Hi Stefan,

thank you very much for the effort and the patience in answering!
I’ll definitely give this a try. I already have so many issues on my computer, one more doesn’t matter;)

thanks again and best regards,
Robin

Citando Stefan Blumentrath Stefan.Blumentrath@nina.no:

Hi Robin,

You could try setting the GRASS_PYTHON environment variable to your
Python installation with fmask.

import os
os.environ[‘GRASS_PYTHON’] = ‘/YOUR/PYTHON/PATH’

As Markus indicates that can cause other issues.

You may also have a look at https://github.com/zarch/grass-session
for inspiration.

Hope that gives you at least a lead…

Cheers
Stefan

-----Original Message-----
From: grass-user grass-user-bounces@lists.osgeo.org On Behalf Of
Robin Kohrs
Sent: tirsdag 31. mars 2020 09:25
To: Markus Neteler neteler@osgeo.org
Cc: GRASS user list grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] Install package for add-on in
/usr/bin/python3

Hi Markus,

thank you very much for your answer and the help!
Do you have any idea what I could do to make the fmask-package
“locatable” for the python-interpreter that grass is using?

I tried the following options, but I guess I just don’t know
sufficiently about how python and grass really work together:

My python-script looks more or less like this:

#!/usr/bin/env python3

import sys

print(“SYS PATH”)
print(sys.path)
print(“”)
print(“SYS EXECUTABLE”)
print(sys.executable)

import grass.script as grass
from rios import fileinfo # that’s where it fails from fmask import
fmask

That’s why I tried until now:

I created an environment with conda and installed python-fmask via
“conda install -c conda-forge python-fmask”. The function
“fmask_sentinel2Stacked.py” lies in
“/home/robin/miniconda3/bin/fmask_sentinel2Stacked.py”.

When I open an interactive python-shell and import fmask and rios
and the type: “fmask.file” it gives me
“/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/fmask/init.py”

I then added
“/home/robin/miniconda3/envs/fmask/lib/python3.7/site-packages/” to
the variable PYTHONPATH in my .bashrc

When I now start the interpreter that grass uses from the command
line by typing “/usr/bin/pyton3” I can import fmask and rios

However when I run the script with grass it always says that there
is no package names rios. Moreover the path I added to PYTHONPATH is
not printed when it executes “sys.path” in my grass script

I’m sorry for this little confusing question. But in case someone
has any idea how I could make grass find fmask, would be super highly
appreciated:)

thanks a lot in advance! Cheers
Robin

Citando Markus Neteler neteler@osgeo.org:

Hi Robin,

On Sat, Mar 21, 2020 at 6:15 PM Robin Kohrs robin.kohrs@uni-jena.de wrote:

Hi everyone:)
I’m really sorry for this naive question. I’m kind of starting with
GRASS and I just can’t find a solution…
The issue is, that I would like to try to write a little GRASS Add-on
and use the python-fmask package. While this package is only
downloadable via conda it always installs into
/home/user/miniconda3/bin/python3. Even when I did conda deactivate prior to this.
I guess that mixing conda packages and “regular” ones is causing troubles.

When I then have the import statement import fask in the
grass-script it always throws an error, saying that fmask is not
installed. When I print the sys.executable in the grass-script it
tells me that the interpreter is in usr/bin/python3. So I thought
that I’d install the fmask-package in a way that this interpreter can
find it while executing the script. But I just don’t know how. I can
add the fmask-path to sys.path, but I don’t think this is the
solution. Maybe someone has a pointer what I’m not getting.
There is also the environment variable PYTHONPATH which could be set
in the session.
But again, mixing might cause problems.

Now I wanted to check
http://pythonfmask.org/en/latest/#downloads
but the server is down…

Hope everyone is good these days:)!
Good luck everyone,

Markus

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