QGIS Python Script - print "HELLO QGIS!" using a Windows Batch File (.bat)

Question

I have a python script (as given below) in QGIS which will just print "Hello QGIS!".

import sys
from qgis.core import *

# Initialize QGIS Application
QgsApplication.setPrefixPath("C:/OSGeo4W/apps/qgis", True)
app = QgsApplication([], True)
QgsApplication.initQgis()

# Add the path to Processing framework
sys.path.append('C:/OSGeo4W/apps/qgis/plugins')

# Import and initialize Processing framework
from processing.core.Processing import Processing
Processing.initialize()
import processing

print 'Hello QGIS!'

Now, I want to execute this python script without opening QGIS by using a Windows Batch File script. The .bat file which I created for this is given below.

REM Change OSGEO4W_ROOT to point to the base install folder
set QGIS_PREFIX_PATH=C:\OSGeo4W\apps\qgis
REM Gdal Setup
set GDAL_DATA=C:\OSGeo4W\share\gdal\
REM Python Setup
set PATH=C:\OSGeo4W\bin;C:\OSGeo4W\apps\qgis\bin;%PATH%
SET PYTHONHOME=C:\OSGeo4W\apps\Python27
set PYTHONPATH=C:\OSGeo4W\apps\qgis\python;%PYTHONPATH%

REM Launch python job
python C:/Users/Sreeraj/.qgis2/processing/scripts/hello.py
pause

Unfortunately, I am getting an error :

File "C:/Users/Sreeraj/.qgis2/processing/scripts/hello.py", line 13, in <module>
from processing.core.Processing import Processing
ImportError: No module named processing.core.Processing

I also tried modifying the .bat file as given below.

SET QGIS_PREFIX_PATH=C:\OSGeo4W\apps\qgis
call "C:/OSGeo4W/bin/o4w_env.bat"
SET PYTHONPATH=C:\OSGeo4W\apps\qgis\python;%PYTHONPATH%
SET PATH=%PATH%;C:\OSGeo4W\apps\qgis\bin

cmd /c python "C:/Users/Sreeraj/.qgis2/processing/scripts/hello.py" 

Again, I am getting the same error :

ImportError: No module named processing.core.Processing

But, clearly, I have set everything correctly and the processing folder is located in C:/Users/Sreeraj/.qgis2/ .

So, what kind of modification do I have to make in order to run this basic python script correctly using a .bat file ?

Answer 1

You need to replace the following line:

sys.path.append('C:/OSGeo4W/apps/qgis/plugins')

with:

sys.path.append('C:/OSGeo4W/apps/qgis/python/plugins')

As this is where the Processing functionalities are stored (the path you initially used contains other core plugins)