How do I get the stack trace from an Exception Object in Python 2.7?

Question

How can I get the full stack trace from the Exception object itself?

Consider the following code as reduced example of the problem:

last_exception = None
try:
    raise Exception('foo failed')
except Exception as e:
    print "Exception Stack Trace %s" % e

Michael · Accepted Answer · 2011-07-08 15:06:44Z

5

The stack trace itself is not stored in the exception object itself. However, you can print the stack trace of the last recent exception using sys.exc_info() and the traceback module. Example:

import sys
import traceback

try:
    raise Exception('foo failed')
except Exception as e:
    traceback.print_tb(*sys.exc_info())

If you do not want to display the stack trace immediately, it should be possible to store the return value of sys.exc_info() somewhere.

answered Jul 8, 2011 at 15:06

Michael

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2 Comments

Jeremy Brown Over a year ago

Storing the result of sys.exc_info() blindly would result in badness... from docs.python.org/library/sys.html#sys.exc_info - "Warning Assigning the traceback return value to a local variable in a function that is handling an exception will cause a circular reference."

Jeremy Brown Over a year ago

Also, instead of traceback.print_tb(*sys.exc_info()), I would recommend docs.python.org/library/traceback.html#traceback.format_exc to get a formatted traceback string.

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