Logging Stacktrace To File

[Olaf Meding]

In case of an exception, how could I log an exception to a file on disk?

Much appreciate your help, thank you.

Olaf

 

[Jorge Godoy]

In case of an exception, how could I log an exception to a file on disk?

I think you'll have to catch the exception and then log it to the file.
After that, you should raise the exception again.

But I think that if any other part of the program deals with such an
exception before you do, then you might miss it.

 

[Olaf Meding]

... have to catch the exception and then log it to the file.

Right. I do also know how to open a file and write to it.

But how do I get at the stack trace? I would like to have it look the same
in the file as what gets printed to the screen.

Thanks again.

Olaf

 

[Peter Hansen]

Right. I do also know how to open a file and write to it.

But how do I get at the stack trace? I would like to have it look the same
in the file as what gets printed to the screen.

You're looking for the standard module "traceback", plus possibly
a call to sys.exc_info()...

The Cookbook has some helpful examples, probably more complex than
what you need:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52215

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65332

-Peter

 

[Peter Otten]

Right. I do also know how to open a file and write to it.

But how do I get at the stack trace? I would like to have it look the
same in the file as what gets printed to the screen.

A quick and dirty approach to deal with _uncaught_ exceptions (untested):
.... sys.stderr = file("tmp.txt", "a")
.... sys.__excepthook__(klass, inst, tb)
.... sys.stderr.close()
.... sys.stderr = sys.__stderr__
....Traceback (most recent call last):
$ cat tmp.txt
Traceback (most recent call last):
File "<stdin>", line 1, in ?
Exception: so what

Peter

 

[BW Glitch]

Right. I do also know how to open a file and write to it.

But how do I get at the stack trace? I would like to have it look the same
in the file as what gets printed to the screen.

The traceback module provides you with that hook. The function is
traceback.print_exc and you can pass a file-like object in the second
parameter.

--
Glitch

http://andres980.tripod.com/tf.html

"... You WIN, you depraved wad a' stinkin' slag."
"Cultivated as always, even in defeat."
-- Rattrap and Megatron, "Fallen Comrades"

 

[Steve Holden]

In case of an exception, how could I log an exception to a file on disk?

Much appreciate your help, thank you.

Olaf

Here's what I use, modulo a certain amount of mangling by Mozilla, which
I am still trying to tame:

def hook(et, ev, eb):
import traceback
log("\n ".join (["Error occurred: traceback
follows"]+list(traceback.format_exception(et, ev, eb))))

sys.excepthook = hook

This works very well, but you'll need to supply your own "log()"
function. Shouldn't be too hard ...

regards
Steve

 

[Olaf Meding]

Thanks to all of you.

Olaf