python - @reboot cronjob not executing -

i have python script writes text , saves file

#! /usr/bin/python3 def main():      filename = '/home/user/testhello.txt'      openfile = open(filename,"w")      print("hello cron", file = openfile) if __name__ == "__main__":      main(); 

i want execute script @ startup via cron. edit crontab listing using

>crontab -e 

my entire crontab looks :

shell = /bin/bash path = /sbin:/bin:/usr/sbin:/usr/bin mailto = root home = / # run-parts 1 * * * * /home/user/tester.py @reboot /home/user/tester.py 

this location of file, , file has permissions execute. can run file no problem script commandline. yet when restart machine, no file generated. trying understand why, , played around crontab entry.

@reboot /usr/bin/python3 /home/user/tester.py 

this didn't work either.

edit:

ps aux | grep crond  

gives me

user     2259 0.0 0.0.  9436  948 pts/0 s+ 23:39   0:00 grep --color=auto crond 

i unsure how check if crond running, or if user in question mounted before/after cron. i'll try with:

sudo crontab -e  

but hasn't worked either.

running:

pgrep cron 

returns 957

mark roberts pointed out few things i'd done wrong.

namely, spaces here

mail = root home = / 

get rid of spaces..

next, having cron configuration fixed email every minute.. instead of had :

*/1 * * * * /home/user/tester.py 

seems me lubuntu doesn't support @reboot cron syntax.