Run Python script repeatedly from bash [duplicate]

Question

I'm trying to run this Python script:

import os

with open('check_door', 'r') as file:
    text_1 = file.readline()

with open('alert_check', 'r') as file2:
    text_2 = file2.readline()

if text_1 == 'locked' and text_2 == 'disabled':
    os.system('python sensor.py')

using this command: watch -n 60 /home/pi/check_sensor.py I'm getting these errors:

/home/pi/check_sensor.py: 1: /home/pi/check_sensor.py: import: not found
/home/pi/check_sensor.py: 2: /home/pi/check_sensor.py: Syntax error: "(" unexpected

What am I doing wrong ?

You need the Python shebang at the beginning of your script if you want to run it as an executable, unless you run the script with the python command. See: stackoverflow.com/questions/6908143/… — sudo
– sudo, Commented Jul 27, 2018 at 21:20

i alarmed alien · Accepted Answer · 2018-07-27 21:20:39Z

0

You need to invoke the python interpreter, as you would do if you were running the script directly.

watch -n 60 "python /home/pi/check_sensor.py"

answered Jul 27, 2018 at 21:20

i alarmed alien

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3 Comments

Charles Duffy Over a year ago

#!/usr/bin/env python would be more conventional -- that way the script itself chooses its interpreter, so you can change the interpreter without modifying anything but the script text itself.

Charles Duffy Over a year ago

Also, note the "Answer Well-Asked Questions" section in How to Answer, particularly the bullet point regarding questions which "have already been asked and answered many times before".

Tom Shanks Over a year ago

Looks like the "more conventional" way also works. Thank you both for helping me !

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