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Subject: Re: My sys.excepthook dies painfully
From: Jason Swails <jason.swails@gmail.com>
In-Reply-To: <CAPTjJmrxZPS6TxZPihU4iShEYJ7NzzYnXi4WFXk3MYbpSp3-yQ@mail.gmail.com>
Date: Wed, 23 Jul 2014 13:02:51 -0700
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To: Chris Angelico <rosuav@gmail.com>
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On Jul 23, 2014, at 1:02 AM, Chris Angelico <rosuav@gmail.com> wrote:

> On Wed, Jul 23, 2014 at 5:46 PM, Steven D'Aprano <steve@pearwood.info> =
wrote:
>> On Wed, 23 Jul 2014 07:14:27 +0000, Steven D'Aprano wrote:
>>=20
>>> I have some code which sets up a logger instance, then installs it =
as
>>> sys.excepthook to capture any uncaught exceptions:
>>=20
>> Oh! I should have said, I'm running Python 2.6.
>=20
> Ah! I tried it in 2.7 and it seemed to work. One moment...
>=20
> huix@huix:~$ python mylogging.py
> Traceback (most recent call last):
>  File "mylogging.py", line 24, in <module>
>    foo  # Die with uncaught NameError.
> NameError: name 'foo' is not defined
> huix@huix:~$ python -V
> Python 2.6.6
> huix@huix:~$ tail /var/log/syslog
> ...
> Jul 23 18:01:49 huix INFO: started logging [mylogging]
> Jul 23 18:01:49 huix INFO: installing error handler [mylogging]
> Jul 23 18:01:49 huix ERROR: Uncaught <type 'exceptions.NameError'>:
> name 'foo' is not defined [mylogging]#012None
>=20
> Still not sure what's going on. Odd.

Works for me, too:

swails@batman ~ $ python2.6 mylogging.py=20
Traceback (most recent call last):
  File "mylogging.py", line 24, in <module>
    foo  # Die with uncaught NameError.
NameError: name 'foo' is not defined
swails@batman ~ $ sudo tail /var/log/messages=20
...
Jul 23 16:02:30 batman INFO:started logging [mylogging]
Jul 23 16:02:30 batman INFO:installing error handler [mylogging]
Jul 23 16:02:30 batman ERROR:Uncaught <type 'exceptions.NameError'>: =
name 'foo' is not defined [mylogging]

I tried it with python2.2 through python2.7 (python 2.2 and earlier did =
not have the logging module).

I'm not sure how the "mylogger" variable is getting set to None in your =
my_error_handler callback, but I don't see how that can possibly be =
happening with the provided code...

All the best,
Jason