UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb6 in position 0: invalid start byte

Benjamin Kaplan benjamin.kaplan at case.edu
Fri Jul 5 09:21:06 CEST 2013


On Jul 5, 2013 12:12 AM, "Lele Gaifax" <lele at metapensiero.it> wrote:
>
> Νίκος Gr33k <nikos at superhost.gr> writes:
>
> > try:
> >       host = socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0]
> > except Exception as e:
> >       host = "Reverse DNS Failed"
> >
> > How can the above code not be able to reeverse dns any more and it
> > falls back to  the failed string?
>
> The only way to know is actually printing out the exception, either to
> stderr, or better using the logging facility, as I suggested.
>
> FYI, your code above is (almost) exactly equivalent to the simpler
>
>     try:
>         host = socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0]
>     except:
>         host = "Reverse DNS Failed"
>
> ciao, lele.
>

They aren't equivalent. "except Exception" won't catch KeyboardInterrupt or
SystemExit or a few others that you really don't want to catch in a generic
error handler. You should almost never have a bare except.
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