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Update intro for clean environment variables #7139

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Update intro for clean environment variables #7139

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13 changes: 13 additions & 0 deletions docs/pyqgis_developer_cookbook/intro.rst
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Expand Up @@ -380,3 +380,16 @@ The reason for using SIP instead of the more widely used SWIG is that the
QGIS code depends on Qt libraries. Python bindings for Qt (PyQt) are
done using SIP and this allows seamless integration of PyQGIS with
PyQt.


Running Python with clean environment variables
---------------------------

Go to the location you installed OSGeo4W (default to ``C:\OSGeo4W``) and
execute the .bat file in there, ``<OSGeo4W>\OSGeo4W.bat``. This .bat
calls other .bat files located in ``<OSGeo4W>\etc\ini`` which cleans up
you system enviroment variables. For example, your python.exe will be
``<OSGeo4W>\bin\python.exe``. But running this python still throws error
when importing qgis.core. Before running python, set the PYTHONPATH to

```SET PYTHONPATH=%OSGEO4W_ROOT%\apps\<qgisversion>\python;%OSGEO4W_ROOT%\apps\<qgisversion>\python\plugins```