Exiting QGIS after running Python script

Question

I would like to run a Python script via qgis --code myscript.py and then immediately exit. I'm using iface.actionExit().trigger(), which kills QGIS when I run it from the Python console, but not when put in the script that I pass to --code.

What's the right way to immediately exit? I'm running QGIS 2.0.1

I've also tried sys.exit(). QGIS catches it and pops up a window with the following:

An error occured during execution of following code:
 execfile('myscript.py')
 
 Traceback (most recent call last):
 File "", line 1, in 
 File "myscript.py", line 14, in 
 sys.exit()
 SystemExit

os.kill(os.getpid(), 9) works but it's a dirty hack and I'm looking for something better.

• Nathan W: You can but why?
• Conley Owens: I'm automatically making a pdf with a print composer (the --screenshot flag just doesn't cut it).
• Joseph: Could you include your code into the question please as this could help potential answerers? I ask this as I also used sys.exit() in my scripts which have worked.
• Conley Owens: echo "sys.exit()" > code.py; qgis --code code.py What version of QGIS were you running? How were you invoking the scripts?

Answer 1

Try in your script:

from qgis.utils import iface
#your code here
iface.actionExit().trigger()

It works for me.

Editing Note:

Based in Conley Owens'comment, I changed slightly my script to do "something useful" (where the line that import iface was commented).

#from qgis.utils import iface
import os
os.system('clear')
print "Hello"
iface.actionExit().trigger()

I ran qgis --code myscript.py at the bash console, inside the folder of the script, and immediately I got this error message:

enter image description here

and indicating that from qgis.utils import iface line is necessary.

When the first line is not commented the script execution had not errors:

enter image description here

but the control was not in the Python console; it is in the bash console (observe the "Hello" print there). For this reason your os.kill(os.getpid(), 9) command works because close the console and automatically close QGIS.

The solution to this issue, if I need the PyQGIS API outside QGIS, it was to include the PYTHONPATH to QGIS (/usr/share/qgis/python) in my .bashrc and to run the script in the bash console as python myscript.py. It works.

In Windows, you can get the PYTHONPATH in the Python Console of QGIS with:

import os
os.getcwd()

and use the Control Panel of Windows to change it.

• Conley Owens: I did try it (as noted in the original question). It doesn't work. Have you actually tried this from the --code option or only from the console? What version of QGIS are you running?
• xunilk: Please, see my "Editing Note".
• Conley Owens: Thanks for the help, but I'm not sure what you mean by running the script in the bash console as python myscript.py, are you suggesting I use the api outside of qgis where I would then have to handle all the overhead of running QgsApplication.initQgis() and loading the project myself? If so, this is going an entirely different route.

Answer 2

It works well for me to do this:

import os
os._exit(0)

It's also useful that you can set an exit code.

Answer 3

Another option in QGIS to exit the script and the QGIS Project is to write:

exit()

For instance:

else:

print("El usuario cancelo la entrada.")
exit() 

So if the code runs the ELSE part, the exit will close the script and the project.