Handling exceptions and printing a useful trace in Python

In writing a test harness for functional automated testing, I'm expecting things to fail. In writing some of the tests, I'm trying to get things to fail, poking around the boundaries etc. WhenI have a test suite that takes 50 hours to run, that I kick off on a Friday night, what I don't want is for it to stop running five minutes after I leave the office.

I want it to carry on with the rest of the tests, but I also want some information about these failures. What exceptions were raised and where they were raised. This is how I'm doing it:

import sys
import traceback
…
try:
    myTestCase.executeTestSteps()
except:
    # handle and log exceptions
    exctype, value, trace = sys.exc_info()[:3]
    extracted_tb = traceback.extract_tb(trace)
    printAndLog("**********************');
    printAndLog(str(exctype) + ':' + str(value))
    for tb_line in extracted_tb:
        printAndLog(str(tb_line[0]) + 'line ' + str(tb_line[1]) + ' in ' + str(tb_line[2]) + ' (' + str(tb_line[3]) + ')')
    printAndLog("**********************');

    del trace

( Where myTestCase is the thing I want to run and printAndLog (you'll have to roll your own) sends to the console and to a log file)