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Since I am currently developing a QGIS Plugin that uses an external python library (Scikit-image), I was wondering, if there is a list of python libraries that come preinstalled with a standard QGIS installation?

(I know how to install additional libraries (See: Installing external python packages for QGIS 3?), but it would be nice, if the user of the plugin does not have to handle the installation of additional libraries. I mean I could also try to automatically install or include them, as described here: Development of a plugin which depends on an external Python library, but to know, what is available would be good to know.)

I did not find such a list yet and since I run a OSGeo4W advanced installed QGIS 3.16 version on Windows 10, that I customized, I am not able to answer this question because I already installed a lot of additional libraries myself.

Otherwise I could just check the folder containing the libraries, which is in my case this one: C:\OSGeo4W64\apps\Python37\Lib\site-packages

In Windows, I can list the plugin folders this way: In cmd prompt change to this directory using

cd C:\OSGeo4W64\apps\Python37\Lib\site-packages

then get the list of the containing folders with the command:

C:\OSGeo4W64\apps\Python37\Lib\site-packages>dir /a:d /b

Interesting would be to know, if rasterio or xarray / rioxarray are preinstalled libraries or not.

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    Don't you want to say Python libraries instead of Python plugins? In QGIS context, there is native Python plugins [name for name, plugin in installer_data.plugins.mPlugins.items() if plugin['readonly']] and the others [name for name, plugin in installer_data.plugins.mPlugins.items() if not plugin['readonly']] whereas when you mention Scikit-image, it's a 3rd party Python library.
    – ThomasG77
    Jun 12, 2021 at 17:18
  • Thank you for clarification. You are absolutely right, I was too tired and mixed it up. I meant 3rd party Python libraries.
    – user19444
    Jun 15, 2021 at 7:02

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You can see a list at https://github.com/qgis/QGIS/blob/master/.docker/qgis3-build-deps.dockerfile#L54

Interesting would be to know, if rasterio or xarray / rioxarray are preinstalled libraries or not.

None are installed e.g rasterio search https://github.com/qgis/QGIS/search?q=rasterio (RasterIO but GDAL), xarray search https://github.com/qgis/QGIS/search?q=xarray

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