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Crontab - Python Script Runs, sends output to mail, but doesn't write to file


Crontab - Python Script Runs, sends output to mail, but doesn't write to file

By : user2951406
Date : November 18 2020, 11:13 AM
this one helps. Try using absolute paths and/or os.chdir to a well-known location early in your script (before opening the file).
code :


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Python e-mail CGI script sends duplicate e-mail

Python e-mail CGI script sends duplicate e-mail


By : user3235291
Date : March 29 2020, 07:55 AM
this one helps. PROBLEM SOLVED!
It turns out that it was the browser's fault all along. The reason I didn't notice this sooner was because I tested it in both Firefox and Chrome ages ago to rule the browser out, however it turns out that both Chrome and Firefox share this same bug.
code :
<img src=""/>
Crontab No Longer Runs Raspberry Pi Python Script in Background But Still Runs Manually

Crontab No Longer Runs Raspberry Pi Python Script in Background But Still Runs Manually


By : pankcool
Date : March 29 2020, 07:55 AM
hop of those help? I just tested this on my Pi running Raspbian and it worked.
First, I created a python script called some_script.py in the primary user's home directory. Script contents:
code :
import sys
import time

with open("/home/username/some_script.py.out", "w") as f:
    f.write(str(time.time()) + " " + "some_script.py RAN!\n")
sudo chmod +x some_script.py
@reboot sleep 2; /usr/bin/python /home/username/some_script.py
cat some_script.py.out 
1458062009.53 some_script.py RAN!
webcam_horz_home = open("horz.txt", "a")
webcam_horz_home = open("/home/pi/horz.txt", "a")
webcam_vert_home = open("vert.txt", "a")
webcam_vert_home = open("/home/pi/vert.txt", "a")
Crontab to run a bash script that runs multiple python scripts

Crontab to run a bash script that runs multiple python scripts


By : Aniket Dixit
Date : March 29 2020, 07:55 AM
To fix this issue Make sure you are creating the cron entries as root. I have had that get me in the past.
Verify your env variables and the python interpreter.
crontab tee command doesn't write stdout into txt file, instead clears it [python script]

crontab tee command doesn't write stdout into txt file, instead clears it [python script]


By : Sudipto Roy
Date : March 29 2020, 07:55 AM
I hope this helps . SUGGESTION: Change your command to tee -a myfile.txt:
Here's the documentation for "tee":
Systemd service does not write python script to file, python script runs nominally when executed from cli

Systemd service does not write python script to file, python script runs nominally when executed from cli


By : unify
Date : March 29 2020, 07:55 AM
I hope this helps you . So the solution is to actually call .close() on the file we are writing to in the python script, then the systemd service works as expected. Shout out to this thread: https://askubuntu.com/questions/83549/python-script-wont-write-data-when-ran-from-cron very last answer = f.close()
and the working script file:
code :
from time import strftime
import board
import busio
import adafruit_bme280

# Create library object using our Bus I2C port
i2c = busio.I2C(board.SCL, board.SDA)
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c,address=0x76)

# OR create library object using our Bus SPI port
#spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
#bme_cs = digitalio.DigitalInOut(board.D10)
#bme280 = adafruit_bme280.Adafruit_BME280_SPI(spi, bme_cs)

# change this to match the location's pressure (hPa) at sea level
bme280.sea_level_pressure = 1013.25

with open("/home/pi/senselog.csv", "w") as log:
    while True:

        temp_h = bme280.temperature
        humidity = bme280.humidity
        pressure = bme280.pressure
        log.write("{0},{1}\n".format(strftime("%Y-%m-%d %H:%M:%S"),str([temp_h,humidity,pressure])))
        log.close()
        time.sleep(60) ```
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