error_callback in multiprocessing.Pool apply_async in Python 2?

Question

Function apply_async of multiprocessing.Pool class has argument error_callback in Python 3. But this argument is missing in Python 2.

Is there any trick to achieve the same functionality in Python 2 ? Ideally I would like to write code which runs in both Python 2 and 3.

Answer 1

I haven't tried python3 yet. But for me, to catch the errors in the child process, I put the function that runs in child process within a

import traceback


try:
    your code that can make error
except Exception as e:
    print e
    return False, traceback.format_exc()
else:
    return True, result

So that I will know if something goes wrong.

EDIT: I change the return format as OP's comment so that the child process returns a tuple (is_success, result or error traceback message )

So that main process will first read the flag is_success and then handles the second argument accordingly.