wrapper_example.py

import sys
import random
import logging
logging.basicConfig(format='[%(levelname)5s] %(message)s',level=logging.DEBUG)

def run(program=''):
    """Function to be wrapped"""
    if not program:
        raise OSError('Not program specified to run.')
    
    logging.debug('Running program ...')
    if program == 'math':
        raise OverflowError('Too much arithmetic')
    else:
        logging.debug('OK')
        return program


def verbose_run(error_message, f, *args):
    """Wrapper for run, logs a custom error message if an exception is raised"""
    try:
        if not args:
            return_value = f()
        else:
            return_value = f(*args)
    except (OSError, OverflowError) as f_err:
        logging.error(error_message)
        logging.error('Logging exception')
        #logging.exception(f_err)
        raise f_err


def main():
    """docstring for main"""
    args = ['', 'math', 'neither blank nor math']
    argument_to_launch = args[random.randint(0, len(args)-1)]
    try:
        verbose_run('Some verbose message', run, argument_to_launch)
    except (OSError, OverflowError) as run_err:
        logging.debug('Exception catched with verbose_run')
        logging.error(run_err)      
    logging.info('Now normal run')
    try:
        run(argument_to_launch)
    except (OSError, OverflowError) as run_err:
        logging.debug('Exception catched with not verbose_run')
        logging.error(run_err)      
        
if __name__ == '__main__':
        main()