Automatically restarting Python Script on Exception

Question

I have a really complicated Python script going on, sometimes it just gets an error, and the only way to debug this, is restarting it, because everything else would make no sense and the error would come back in no time (I already tried a lot of things, so please dont concentrate on that)

I want a .bat script (im on Windows unfortunately) that restarts my python script, whenever it ends. Another python script is also fine.

How can I do that? Thanks in advance

just create bat file add set env=python.exe start python script.py — Hariom Singh
– Hariom Singh, Commented Aug 1, 2017 at 23:25
But that only starts the python file, it doesnt restart it, when it crashs? — user8393645
– user8393645, Commented Aug 1, 2017 at 23:26
tasklist /FI "IMAGENAME eq python.exe" 2>NUL | find /I /N "python.exe">NUL if "%ERRORLEVEL%"=="0" echo Program is running — Hariom Singh
– Hariom Singh, Commented Aug 1, 2017 at 23:27

Hariom Singh · Accepted Answer · 2017-08-01 23:51:15Z

1

set env=python.exe  
tasklist /FI "IMAGENAME eq python.exe" 2>NUL | find /I /N "python.exe">NUL if "%ERRORLEVEL%"!="0(
   start python script.py
)

Other way from python to execute python

import subprocess
from subprocess import call

def processExists(processname):
    tlcall = 'TASKLIST', '/FI', 'imagename eq %s' % processname
    # shell=True hides the shell window, stdout to PIPE enables
    # communicate() to get the tasklist command result
    tlproc = subprocess.Popen(tlcall, shell=True, stdout=subprocess.PIPE)
    # trimming it to the actual lines with information
    tlout = tlproc.communicate()[0].strip().split('\r\n')
    # if TASKLIST returns single line without processname: it's not running
    if len(tlout) > 1 and processname in tlout[-1]:
        print('process "%s" is running!' % processname)
        return True
    else:
        print(tlout[0])
        print('process "%s" is NOT running!' % processname)
        return False



if not processExists('python.exe')
   call(["python", "your_file.py"])

edited Aug 1, 2017 at 23:51

answered Aug 1, 2017 at 23:30

Hariom Singh

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13 Comments

user8393645 Over a year ago

? This still isnt clear code, also it doesnt execute my python file, where do I have to put the folder in where the .py is in?

Hariom Singh Over a year ago

add python to your environment variable .. set env = "To your path python.exe"

user8393645 Over a year ago

Sorry I have no clue of batch

user8393645 Over a year ago

set env="C:\Users\admin\AppData\Local\Programs\Python\Python36-32 python.exe" tasklist /FI "IMAGENAME eq python.exe" 2>NUL find /I /N "python.exe">NUL if "%ERRORLEVEL%"!="0( start python sh2bot.py )

Hariom Singh Over a year ago

right click ..create new file as text add your commands and save it as .bat

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