[QGIS-Developer] PyQGIS unavailable at QGIS startup time on OSGeo4W

[Eric Lemoine]

Hi QGIS devs!

I need to use a PyQGIS startup script (set via the PYQGIS_STARTUP
envvar). And I want to do "import qgis" from that startup script!

It works on Linux, because PyQGIS is installed in the system-wide
Python environment. So no problem here.

But it doesn't work with OSGeo4W. OSGeo4W installs PyQGIS in
C:/OSGeo4W64/apps/qgis/python, and that path isn't in sys.path when my
startup script is executed.

The C:\OSGeo4W64\bin\qgis-bin.env file indeed does not set PYTHONPATH.
Likewise, the C:\OSGeo4W64\bin\py3_env.bat file, which
C:\OSGeo4W64\bin\qgis.bat includes, has "SET PYTHONPATH=" (PYTHONPATH
set to nothing).

What do you think? Shouldn't OSGeo4W set PYTHONPATH to
"%OSGEO4W_ROOT%\apps\qgis\python;%PYTHONPATH%" in py3_env.bat and
qgis-bin.env for startup scripts to be able to import and use the qgis
module?

Thanks!

-- 
Éric Lemoine
Oslandia