Well this unusual. I have a python program that writes its results to a CSV file, but which wouldn't do so when run via a Cron job. I was minutes away from giving up and asking for help when I accidentally solved the problem.
As I've not found this solution online despite extensive searching, I'm posting it here in the hope that it may be useful to someone else.
The python file ends with the following code:and this was my last-but-one attempt in Crontab, which didn't work:
The solution was just to change the file extension in the Cron job:...which successfully writes to sensorData.csv, and not sensorData.txt
Of course a CSV file is a effectively text file, but that was an unexpected result.
As I've not found this solution online despite extensive searching, I'm posting it here in the hope that it may be useful to someone else.
The python file ends with the following code:
Code:
f = open("/home/pi/sensorData.csv", "a", encoding="ISO-8859-1")f.write(f"{', '.join(data.values())}\n")f.close()Code:
0,15,30,45 * * * * /usr/bin/python3 /home/pi/sensor.py >> /home/pi/sensorData.csvThe solution was just to change the file extension in the Cron job:
Code:
0,15,30,45 * * * * /usr/bin/python3 /home/pi/sensor.py >> /home/pi/sensorData.txtOf course a CSV file is a effectively text file, but that was an unexpected result.
Statistics: Posted by Centuri — Sat Nov 02, 2024 9:09 pm — Replies 2 — Views 55