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I want to install some third-party Python modules for QGIS 3 on Mac, however, I have no clue how to do it, since I am not so much familiar with different Python environments.

Is there any similar thing to the OSGeo4W Shell on Mac, or is it possible to do via the terminal?

1
  • I ended up building the packages in another python and copying them into /Applications/QGIS3.14.app/Contents/Resources/python. Nasty. Jun 24 '20 at 9:28
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from Download for Macos

These packages use the python.org Python 3, version 3.6, the "macosx10.9" build - other distributions are not supported. Install Python before installing QGIS.

1) To know the python interpreter path used by QGIS

In the Python console of QGIS

import sys
print(sys.executable)
/usr/local/bin/python3.6

2) then in the terminal

$ /usr/local/bin/python3.6
Python 3.6.8 
...
>>>

3) and you can install third-party Python modules from the terminal

/usr/local/python/bin/python3.6 -m pip install shapely

or

/usr/local/bin/python3.6 setup.py install

New

I cannot install the 3.10 version in my Mac, but if I examine the application file:

The content of /Applications/QGIS3.10.app/Contents/MacOS/

The QGIS executable is here

enter image description here

In the /Applications/QGIS3.10.app/Contents/MacOS/bin folder

enter image description here

There is a symbolic link file python3 that points to /Applications/QGIS3.10.app/QGIS3.10.app/Contents/Frameworks/Python.framework/Versions/3.7/Resources/Python.app/Contents/MacOS/Python

enter image description here

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  • Hi and thanks for the answer. When I run the command sys.executable from my python console I get the following link: /Applications/QGIS3.10.app/Contents/MacOS/QGIS, and when I type it in the terminal then QGIS3 just opens. Is there an alternative python command to find the path to the python environment?
    – Pawel
    Feb 20 '20 at 16:00
  • In the Python console of QGIS ? (because /Applications/QGIS3.10.app/Contents/MacOS/QGIS is the executable of QGIS, not of Python) -> see New above
    – gene
    Feb 20 '20 at 17:50
  • It still doesn't work for me when I enter these directories and type python -m pip install 'package'. It's like the python that is being called is the default python installed on Mac and not the python installed in the QGIS3 environment... Is there a terminal command to make sure that the python and pip called is the one running in QGIS3, and not the other one (though the versions are the same)?
    – Pawel
    Feb 21 '20 at 15:45
  • The one running in QGIS3 is the sys.executable result in the QGIS3 Python console (the default python installed on Mac is version 2.x)
    – gene
    Feb 21 '20 at 16:08
  • I remember that I had once changed the main python of the mac from 2 to 3, but how do I call the one in the python console from the terminal?
    – Pawel
    Feb 21 '20 at 18:17
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Tested on QGIS 3.14 under MacOSX 10.15.

In QGIS, go to menu Settings > System and search for Environment options:

enter image description here

Check the Use custom variables checkbox, and :

  • In the Apply column, choose Append ;
  • In the Variable column, write PYTHONPATH ;
  • In the Value column, write the path to the directory with python modules as :/Users/me/Library/Python/3.8/lib/python/site-packages

Beware, to correctly separate environment variables, don't forget the colon.

Restart QGIS and in the QGIS Python console, try to import your module.

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