Make gdal_calc.py available via the Python API

[cpaulik]

It would be neat to be able to access gdal_calc.py via

from osgeo import gdal

gdal.Calc(...)

I've seen that the functions are already split in a sensible way in gdal_calc.py. Would you be open to a merge request that moves the code to an importable location while not changing the CLI?

[rouault]

I'm not sure how you could do what you want to do since that would involve mixing gdal_calc.py with the GDAL Python module. But you should already be able to import gdal_calc, and call gdal_calc.doit()

[cpaulik]

Doing import gdal_calc does not work for me.

gdal_calc.py is located lib/python2.7/site-packages/GDAL-2.4.2-py2.7-linux-x86_64.egg-info/scripts in my environment which is not in the PYTHONPATH

Shouldn't it work to move the needed functions into a module and then import them in https://github.com/OSGeo/gdal/blob/master/gdal/swig/include/python/gdal_python.i#L82 to make them available when the gdal module is generated?

[rouault]

Shouldn't it work to move the needed functions into a module and then import them in https://github.com/OSGeo/gdal/blob/master/gdal/swig/include/python/gdal_python.i#L82 to make them available when the gdal module is generated?

that's a possility. For backward compatibility we'd still want the gdal_calc.py script to be usable (would probably be a few line long script importing the module and excuting gdal.Calc())

[Japhetho]

Working on a task that will really benefit from gdal.Calc() instead of subprocess.call([sys.executable, 'venv/Scripts/gdal_calc.py'... which is really hard to package in an installer. Was the provision of gdal_calc via the Python API achieved so far?