Capturing exceptions?

[Dfenestr8]

Hi.

What's the easiest way to capture the traceback from an exception, and
write it to a file? Ideally, I'd like to be able to do something like:

 

[Mathias Waack]

What's the easiest way to capture the traceback from an exception,
and write it to a file? Ideally, I'd like to be able to do
something like:

Have a look at the traceback module.

Mathias

 

[Michael Hudson]

Hi.

What's the easiest way to capture the traceback from an exception, and
write it to a file? Ideally, I'd like to be able to do something like:

Read up on the traceback module.

Cheers,
mwh

 

[Larry Bates]

You need to set up an exception hook function, register
it with Python and have it write out the traceback
information to your file.

def excepthook(type, value, tb):
#
# This function allows the user to redefine what happens if the program
# aborts due to an uncaught exception.
#
import traceback
#
# Get traceback lines and append the current session log
#
tblines=traceback.format_exception(type, value, tb)
#
# Insert code to write to file here
#
f=open('traceback.log', 'a')
f.writelines(tblines)
f.close()
sys.exit(0)

Then in main program

#
# Set the sys.excepthook so I can clean up properly if main program
aborts
#
sys.excepthook=excepthook

 

[Dfenestr8]

Have a look at the traceback module.

Mathias

I did. Thanx. But I'm afraid I don't understand it.

From looking at the docs, it would appear the method extract.tb(traceback,
limit) is the method I want. But it appears to want some kind of object as
its parameter, and I have no idea what kind of object that is.

I've tried "a = traceback.extract_tb(tb)",
"traceback.extract_tb(traceback)", "traceback.extract_tb(sys.exc_info())".

What kind of parameter does it need?

 

[Mathias Waack]

I did. Thanx. But I'm afraid I don't understand it.

import traceback
try: raise Exception, "python is so cool"
except: traceback.print_exc(None,file("exc.trc","w"))

Does it that what you want?

Mathias

 

[Dfenestr8]

import traceback
try: raise Exception, "python is so cool" except:
traceback.print_exc(None,file("exc.trc","w"))

Does it that what you want?

Mathias

yep. Should do.

Thanx.

PS: Still would like to know what kind of parameter that other method
wants.