custom_exceptions.py

#coding: utf-8

import sys


class CustomException(Exception):
    '''Wrap arbitray pending exception, if any, in addition to other info.'''

    def __init__(self, *args):
        super(CustomException, self).__init__(*args)
        self.wrapped_exc = sys.exc_info()


class AlwaysWrongException(Exception):
    '''Always do it wrong.'''


def call_wrapped(callable, *args, **kwargs):
    try:
        return callable(*args, **kwargs)
    except:
        raise (CustomException, "Wrapped function propagated exception.")


def always_wrong(*args, **kwargs):
    raise AlwaysWrongException


if __name__ == '__main__':
    try:
        call_wrapped(always_wrong)
    except CustomException, e:
        print e.wrapped_exc