python - futures.ThreadPoolExecutor Exceptions -

i'm implementing futures.threadpoolexecutor , change broad exception specific exceptions (e.g. valueerror). using example below should add exceptions generated load_url instead of broad exception? exceptions section of code referring to.

using this page reference:

import concurrent.futures import urllib.request  urls = ['http://www.foxnews.com/',         'http://www.cnn.com/',         'http://europe.wsj.com/',         'http://www.bbc.co.uk/',         'http://some-made-up-domain.com/']  # retrieve single page , report url , contents def load_url(url, timeout):     if not url:        raise valueerror('invalid url')     urllib.request.urlopen(url, timeout=timeout) conn:         return conn.read()  # can use statement ensure threads cleaned promptly concurrent.futures.threadpoolexecutor(max_workers=5) executor:     # start load operations , mark each future url     future_to_url = {executor.submit(load_url, url, 60): url url in urls}     future in concurrent.futures.as_completed(future_to_url):         url = future_to_url[future]         try:             data = future.result()         except exception exc:             print('%r generated exception: %s' % (url, exc))         else:             print('%r page %d bytes' % (url, len(data)))