[Qgis-user] how to import processing.py from outside QGIS?

[Uwe Fischer]

Hello,

 

I' m trying to access commands from the processing toolbox from outside a
QGIS Session via Python. I found an example made by Ujaval Gandhi
(spatialthoughts.com) which contains the following:

 

# Add the path to Processing framework

sys.path.append('c:\\Users\\myUsername\\.qgis2\\python\\plugins')

 

# Import and initialize Processing framework

from processing.core.Processing import Processing

Processing.initialize()

import processing

 

That did not work for me (in QGIS 2.12 and 2.14), I got an error message
"Import error: no module named processing.core.Processing".

 

I checked the path and found that there is no file "Processing.py" in that
folder under .qgis2. So I wonder how it should be found there?

 

Now, I started to look for the file myself using the command window MS-DOS:
dir /s processing.py, and the file was found in:

Verzeichnis von C:\Program Files\QGIS Essen\apps\qgis\python\processing\core

Processing.py  15.578 Bytes ...

 

I tried that path for sys.path.append() in the above code and got the same
error as before.

 

Then, I started QGIS (by the way: I started it just as a check. I'd like to
create a script that works from outside QGIS).

In the QGIS Python console, it' no problem to import processing. That means
that it is present on the computer. So I checked the path that is used here:


import sys

print sys.path

 

I got a very long confusing list, but the only entry containing the string
"processing" is:

 

'C:/PROGRA~1/QGISES~1/apps/qgis/./python/plugins\\processing'

 

So I thougt that this must be the path to import processing.

But trying exactly that in the above code, I got the same error as above.

 

Now, my questions are:

what did I do wrong? where is Processing.py to be found?

Why did my search produce wrong results? Am I wrong in assuming that I have
to provide the path to "Pythonfile.py" if I want "import Pythonfile" to
work??

 

 

Thanks and regards, Uwe

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