Generic catch for python

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.

nosklo · Accepted Answer · 2009-01-14 09:25:41Z

220

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:

edited Jan 14, 2009 at 9:25

answered Jan 14, 2009 at 9:12

nosklo

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2 Comments

monkut Over a year ago

didn't know about the "Exception as e" change. "Exception, e" always bugged me, nice to see it got cleaned up.

pixelbeat Over a year ago

'as' keyword is for python >= 2.6

unbeknown · Accepted Answer · 2009-01-14 09:10:18Z

5

The traceback module is quite useful for formatting tracebacks. You can then write it to a logfile.

answered Jan 14, 2009 at 9:10

unbeknown

Comments

Swaroop C H · Accepted Answer · 2009-01-14 09:07:41Z

2

Does this work? :

except BaseException, e:

answered Jan 14, 2009 at 9:07

Swaroop C H

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1 Comment

nosklo Over a year ago

You shouldn't catch BaseException - it includes SystemExit and KeyboardInterrupt, things you usually don't want to catch.

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