Question

I have some extremely weird behavior that seems to result in silent exceptions. How can I write a general try catch where I can debug all exceptions. Something along the lines of:

try:     # something that fails except e:     print e 

A bit more about the problem at hand in detail:

I have a Django app that on my computer (Ubuntu Linux 8.10) works fine both through runserver and mod-python. On the deploy server (Ubuntu Linux 8.10) it works fine through runserver, but fails via apache in mod-python.

I have reduced the cause down to a part off the app that uses Berkeley DB (bsddb.db), and secondary keys. The callback method for secondary keys uses pickle to format the keys. It fails when I call pickle on a single value. However, it only fails when I use cPickle, and using pickle on the same values outside the callback function also works.

I just want to know why it fails with cPickle.

Answer 1

Exceptions are already printed by default before program termination. If you want to send the error somewhere else (not print it) you can do this:

try:     something() except Exception as e:     send_somewhere(traceback.format_exception(*sys.exc_info()))     raise # reraises the exception 

note that this format using the as keyword is for python > 2.6. The old way was:

except Exception, e: