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is there any means of telling QGIS to use a different Python installation than the default, system-wide one? E.g. use some virtualenv Python /myvirtualenv/bin/python instead of /usr/bin/python?

Background: I'm developing a custom plugin that uses some modules which are only installed in a certain virtualenv, but not system-wide.

The virtualenv is allowed to access system-wide packages, so the qgis core libs should still be accessible when using that virtualenv.

The only solution that I see right now is to install the required modules in the system-wide Python. However, I'd like to keep them in the virtualenv only, if possible.

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2 Answers 2

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You can first load your virtual environment and then start QGIS in the same terminal where you loaded the virtual environment.

for example in linux:

source /myvirtualenv/bin/activate
qgis
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    this didn't work for me (QGIS 3.4.4, linux mint 18)
    – Rodrigo E. Principe
    Jul 18, 2019 at 17:04
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I cannot guarantee this will work but perhaps you could try setting a custom variable to load your python version:

System Environment

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