crontab not running python script for Rpi.GPIO

Question

I have a python script which I am trying to run at boot using

sudo crontab -e

using the following command

@reboot python /usr/local/sbin/ShutdownJumper.py

the script ShutdownJumper.py begins with:

#!/usr/bin/env python
#note crontab for superuser required a new PATH variable as here https://unix.stackexchange.com/questions/43392#answer-43394
import subprocess
try:
 import RPi.GPIO as GPIO
except RuntimeError:
 print("Error importing RPi.GPIO! This is probably because you need superuser privileges. You can achieve this by using 'sudo' to run your script")

when I reboot my RPi I get the following email back:

Traceback (most recent call last):
  File "/usr/local/sbin/ShutdownJumper.py", line 4, in <module>
    import RPi.GPIO as GPIO
ImportError: No module named RPi.GPIO

I've tried changing the PATH in the crontab, so no avail..

what interpreter does python point to in your system? is RPi installed for that interpreter? is the path to RPi in your default PYTHONPATH? if not you could set sys.path to include the path to RPi in your python script. — hiro protagonist
– hiro protagonist, Commented Jan 28, 2017 at 9:05
Ok so /usr/bin/python links to /usr/bin/python2.7. If I run the script using sudo as user ubuntu, the script will run correctly. I haven't used paths in python before? — phaseform
– phaseform, Commented Jan 29, 2017 at 4:58

Kanishka · Accepted Answer · 2017-02-03 16:40:46Z

1

Try to use this code on crontab

@reboot cd /usr/local/sbin && sudo python ShutdownJumper.py

edited Feb 3, 2017 at 16:40

answered Feb 3, 2017 at 9:31

Kanishka

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1 Comment

phaseform Over a year ago

works fine from the command line. Same error in my email:

Traceback (most recent call last):    File "ShutdownJumper.py", line 5, in <module>     import RPi.GPIO as GPIO ImportError: No module named RPi.GPIO

:/

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