C:\Python27>python download.py http
Traceback (most recent call last):
  File "download.py", line 15, in <module>
    os.path.join(os.environ['TEMP'], 'test1.html'))
  File "download.py", line 5, in download
    f.write(urllib2.urlopen(url).read())
  File "C:\Python27\lib\urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Python27\lib\urllib2.py", line 431, in open
    response = self._open(req, data)
  File "C:\Python27\lib\urllib2.py", line 449, in _open
    '_open', req)
  File "C:\Python27\lib\urllib2.py", line 409, in _call_chain
    result = func(*args)
  File "C:\Python27\lib\urllib2.py", line 1227, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "C:\Python27\lib\urllib2.py", line 1197, in do_open
    raise URLError(err)
urllib2.URLError: <urlopen error [Errno -1] getaddrinfo failed>

C:\Python27>python download.py ftp
Traceback (most recent call last):
  File "download.py", line 18, in <module>
    os.path.join(os.environ['TEMP'], 'test2.txt'))
  File "download.py", line 5, in download
    f.write(urllib2.urlopen(url).read())
  File "C:\Python27\lib\urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Python27\lib\urllib2.py", line 431, in open
    response = self._open(req, data)
  File "C:\Python27\lib\urllib2.py", line 449, in _open
    '_open', req)
  File "C:\Python27\lib\urllib2.py", line 409, in _call_chain
    result = func(*args)
  File "C:\Python27\lib\urllib2.py", line 1404, in ftp_open
    raise URLError(msg)
urllib2.URLError: <urlopen error [Errno -1] getaddrinfo failed>