import urllib class HookException Exception pass def hook chunk chunk_

import urllib

class HookException(Exception):
    pass

def hook(chunk, chunk_size, total_size):
    raise HookException(total_size)

def get_size(url):
    try:
        urllib.urlretrieve(url, reporthook=hook)
    except HookException, ex:
        return ex.message

url = 'http://ya.ru'
print get_size(url)