[Tutor] help with subprocess module

[Peter Otten]

kay Cee wrote:

> I made a python script that will update a Ubuntu Server every second and
> writes asuccess message  and date to a log file, but for some reason the
> file is not being written to.
> 
> Here is the Script:
> 
> 
> #!/usr/bin/python3
> 
> 
> 
> import subprocess
> 
> import time
> 
> import datetime
> 
> 
> class UpdateError(Exception):
> 
>     pass
> 
> 
> def update():
> 
>     while True:
> 
>         try:
> 
>             update_log = open('update_log.txt', 'r+')
> 
>             time.sleep(1)
> 
>             subprocess.call(['apt-get', 'update', '-y'])
> 
>             date = datetime.datetime.now()
> 
>             update_log.write("System was updated sucessfully on
>             {}\n".format
> (str(date)))
> 
>             subprocess.call(['reboot'])

Hm, are you sure you want to reboot here?

> 
> 
>         except UpdateError:
> 
>             print("Update Error!!!")
> 
> 
>     update_log.close()
> 
> 
> if __name__ == '__main__':
> 
>     update()
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