traceback as string

[John Hunter]

What is the best way to get the traceback as a string. I tried

def exception_to_st r(s = None):

sh = StringIO.String IO()
if s is not None: print >>sh, s
traceback.print _stack(sh)
return sh.getvalue()
but got

Traceback (most recent call last):
File "/home/jdhunter/seizure/python/eegdb/eegview/eegview.py", line 944, in on_menuFileOpen _activate
msg = exception_to_st r('Could not read data:')
File "/hunter/jdhunter/python/projects/jdh/jdh/cbook.py", line 707, in exception_to_st r
traceback.print _stack(sh)
File "/usr/local/lib/python2.3/traceback.py", line 235, in print_stack
print_list(extr act_stack(f, limit), file)
File "/usr/local/lib/python2.3/traceback.py", line 266, in extract_stack
lineno = f.f_lineno

Thanks!
John Hunter

[Colin Brown]

"John Hunter" <jd******@ace.b sd.uchicago.edu > wrote in message
news:ma******** *************** **************@ python.org...

What is the best way to get the traceback as a string.

I define the following module "Excepts.py " for logging exceptions in daemon
processes:

------------------------------------------
import sys,traceback

def error():
tb =
traceback.forma t_exception(sys .exc_info()[0],sys.exc_info()[1],sys.exc_info(
)[2])
return tb[len(tb)-1].replace('\n',' ')

def errorstack():
return
''.join(traceba ck.format_excep tion(sys.exc_in fo()[0],sys.exc_info()[1],sys.e
xc_info()[2]))
-------------------------------------------

Colin Brown
PyNZ

[Stephen Ferg]

I haven't been using this function for very long, but it seems to work.

You pass it the exception object, and it returns a string.

=============== =============== =============== ======

def exception_forma t(e):
"""Convert an exception object into a string,
complete with stack trace info, suitable for display.
"""
import traceback
info = "".join(traceba ck.format_tb(sy s.exc_info()[2]))
return str(e) + "\n\n" + info

=============== =============== =============== =======

Here's an example of how to use it.

=============== =============== =============== =====

try:
main1()
except Exception, e:
print exception_forma t(e)

=============== =============== =============== =======

[John J. Lee]

st***@ferg.org (Stephen Ferg) writes:
[...]

try:
main1()
except Exception, e:
print exception_forma t(e)

[...]

Just a semi-random warning for anybody as stupid as me: "finally:"
blocks do not handle exceptions, so don't expect things like using the
traceback module to work there:

try:
main1()
finally:
print exception_forma t(e) # WRONG
I spent a long time tracing through the Python source code trying to
track down a non-existent bug in a C extension, thanks to this
misconception. :-(
John