How to know if urllib.urlretrieve succeeds?

Question

urllib.urlretrieve returns silently even if the file doesn\'t exist on the remote http server, it just saves a html page to the named file. For example:

Answer 1

class MyURLopener(urllib.FancyURLopener):
    http_error_default = urllib.URLopener.http_error_default

url = "http://page404.com"
filename = "download.txt"
def reporthook(blockcount, blocksize, totalsize):
    pass
    ...

try:
    (f,headers)=MyURLopener().retrieve(url, filename, reporthook)
except Exception, e:
    print e