'sys.excepthook' and threading

user_198869 0
Viewed 10847

I am using Python 2.5 and trying to use a self-defined excepthook in my program. In the main thread it works perfectly fine. But in a thread started with the threading module the usual excepthook is called.

Here is an example showing the problem. Uncommenting the comment shows the desired behaviour.

import threading, sys

def myexcepthook(type, value, tb):
    print 'myexcepthook'

class A(threading.Thread, object):

    def __init__(self):
        threading.Thread.__init__(self, verbose=True)
#       raise Exception('in main')
        self.start()

    def run(self):
        print 'A'
        raise Exception('in thread')            

if __name__ == "__main__":
    sys.excepthook = myexcepthook
    A()

So, how can I use my own excepthook in a thread?

exception-handling multithreading exception python
3 Answers

I just stumbled over this problem and as it turns out, it was the right time to do so.

New in version 3.8: threading.excepthook

Handle uncaught exception raised by Thread.run().

The args argument has the following attributes:

exc_type: Exception type.
exc_value: Exception value, can be None.
exc_traceback: Exception traceback, can be None.
thread: Thread which raised the exception, can be None.

I don't know why, but be aware, that unlike sys.excepthook, threading.excepthook receives the arguments as a namedtuple instead of multiple arguments.

user_37989640
Related