try:
    self.thr = SomeThreadClass()
    time.sleep(1)
    self.thr.start()
except Exception, error:
    print str(error)

class SomeThreadClass:
    def run(self):        
        try:
            some_action()
        except Exception, error:
            raise Exception('Some action failed')

#!/usr/bin/env python
# -*- coding: UTF-8 -*-

from multiprocessing import Queue, Process

class MyMegaException(Exception): pass

def deadlytask(queue):
    queue.put(MyMegaException("Kranty 6"))

def main():
    queue = Queue()
    task = Process(target=deadlytask, args=(queue,))
    task.start()
    while task.is_alive():
        data = queue.get()
        raise data

if __name__ == '__main__':
    main()