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Re: FileNotFoundError thrown due to file name in file, rather than file itself

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From Roel Schroeven <roel@roelschroeven.net>
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Subject Re: FileNotFoundError thrown due to file name in file, rather than file itself
Date Wed, 13 Nov 2024 10:12:07 +0100
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Op 12/11/2024 om 20:10 schreef Left Right via Python-list:
> > I am not entirely convinced by NB2.  I am, in fact, a sort of sysadmin
> > person and most of my programs write to a log file.  The programs are
> > also moderately complex, so a single program might access a database,
> > query an LDAP server, send email etc., so potentially quite a lot can go
> > wrong.  They are also not programs whose output I would pipe to another
> > command.  What would be the advantage of logging to stderr?  Quite apart
> > from that, I find having a log file a useful for debugging when I am
> > developing.
>
> First, the problem with writing to files is that there is no way to
> make these logs reliable.  This is what I mean by saying these are
> unreliable: since logs are designed to grow indefinitely, the natural
> response to this design property is log rotation.  But, it's
> impossible to reliably rotate a log file.  There's always a chance
> that during the rotation some log entries will be written to the file
> past the point of rotation, but prior to the point where the next logs
> volume starts.

What I most often do is use one logfile per day, with the date in the 
filename. Then simply delete all files older than 7 days, or 30 days, or 
whatever is useful for the task at hand. Not only does that sidestep any 
issues with rotating logs, but I also find it's very useful to have the 
date in the filename.
> Of course, if you only administer your own computer, and you have low
> single digits programs to run, and their behavior doesn't change
> frequently, and you don't care to drop some records every now and
> then... it's OK to log to files directly from a program.  But then you
> aren't really in the sysadmin / infra / ops category, as you are more
> of a hobby enthusiast.
I would not use my scheme for something released to a wider audience. 
For in-house software though, I like that I can easily put each 
application's logs next to its other data files, and that I don't have 
to figure out how to get the system's own log infrastructure to work is 
I want it to.
> Finally, if you want your logs to go to a file, and currently, your
> only option is stderr, your shell gives you a really, really simple
> way of redirecting stderr to a file.
I feel this is the worst of both worlds. Now your program doesn't have 
any control over filename or log expiration, and neither does your 
system's logging infrastructure. You just get one indefinitely growing 
log file.

-- 
"You can fool some of the people all the time, and all of the people some
of the time, but you cannot fool all of the people all of the time."
         -- Abraham Lincoln
"You can fool too many of the people too much of the time."
         -- James Thurber

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Thread

FileNotFoundError thrown due to file name in file, rather than file itself "Loris Bennett" <loris.bennett@fu-berlin.de> - 2024-11-11 15:05 +0100
  Re: FileNotFoundError thrown due to file name in file, rather than file itself Left Right <olegsivokon@gmail.com> - 2024-11-11 17:04 +0100
    Re: FileNotFoundError thrown due to file name in file, rather than file itself "Loris Bennett" <loris.bennett@fu-berlin.de> - 2024-11-12 10:15 +0100
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Left Right <olegsivokon@gmail.com> - 2024-11-12 20:10 +0100
        Re: FileNotFoundError thrown due to file name in file, rather than file itself Greg Ewing <greg.ewing@canterbury.ac.nz> - 2024-11-13 14:04 +1300
          Re: FileNotFoundError thrown due to (Posting On Python-List Prohibited) Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-11-13 02:13 +0000
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Mats Wichmann <mats@wichmann.us> - 2024-11-12 13:28 -0700
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Chris Angelico <rosuav@gmail.com> - 2024-11-13 07:34 +1100
      Re: FileNotFoundError thrown due to file name in file, rather than file itself "Loris Bennett" <loris.bennett@fu-berlin.de> - 2024-11-13 08:11 +0100
        Re: FileNotFoundError thrown due to file name in file, rather than file itself Barry <barry@barrys-emacs.org> - 2024-11-14 16:01 +0000
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Roel Schroeven <roel@roelschroeven.net> - 2024-11-13 10:12 +0100
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Michael Torrie <torriem@gmail.com> - 2024-11-13 21:07 -0700
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Left Right <olegsivokon@gmail.com> - 2024-11-14 08:03 +0100
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Chris Angelico <rosuav@gmail.com> - 2024-11-14 19:13 +1100
      Re: FileNotFoundError thrown due to file name in file, rather than file itself D'Arcy Cain <darcy@VybeNetworks.com> - 2024-11-13 06:37 -0700
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Ethan Furman <ethan@stoneleaf.us> - 2024-11-14 09:32 -0800
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Michael Torrie <torriem@gmail.com> - 2024-11-14 08:44 -0700
        Re: FileNotFoundError thrown due to file name in file, rather than file itself Jon Ribbens <jon+usenet@unequivocal.eu> - 2024-11-14 18:12 +0000
  Re: FileNotFoundError thrown due to file name in file, rather than file itself dieter.maurer@online.de - 2024-11-11 18:24 +0100
  Re: FileNotFoundError thrown due to (Posting On Python-List Prohibited) Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-11-11 21:05 +0000
  Re: FileNotFoundError thrown due to file name in file, rather than file itself Chris Angelico <rosuav@gmail.com> - 2024-11-12 12:17 +1100
    Re: FileNotFoundError thrown due to file name in file, rather than file itself "Loris Bennett" <loris.bennett@fu-berlin.de> - 2024-11-12 10:00 +0100
      Re: FileNotFoundError thrown due to file name in file, rather than file itself dieter.maurer@online.de - 2024-11-13 19:36 +0100
      Re: FileNotFoundError thrown due to file name in file, rather than file itself Kushal Kumaran <kushal@locationd.net> - 2024-11-13 14:40 -0800
    Re: FileNotFoundError thrown due to file name in file, rather than file itself "Loris Bennett" <loris.bennett@fu-berlin.de> - 2024-11-12 10:03 +0100

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