If Win32 has a proxy enabled, ftp urls will NOT work in
urllib.

Here is a trace:
Traceback (most recent call last):
  File
"C:\Python22\lib\site-packages\Pythonwin\pywin\framework\scriptutils.py",
line 301, in RunScript
    exec codeObject in __main__.__dict__
  File "C:\Python22\Lib\urllib.py", line 1457, in ?
    main()
  File "C:\Python22\Lib\urllib.py", line 1448, in main
    test(args)
  File "C:\Python22\Lib\urllib.py", line 1410, in test
    fn, h = urlretrieve(url, None, reporthook)
  File "C:\Python22\Lib\urllib.py", line 80, in urlretrieve
    return _urlopener.retrieve(url, filename,
reporthook, data)
  File "C:\Python22\Lib\urllib.py", line 210, in retrieve
    fp = self.open(url, data)
  File "C:\Python22\Lib\urllib.py", line 178, in open
    return getattr(self, name)(url)
  File "C:\Python22\Lib\urllib.py", line 438, in open_ftp
    host, path = splithost(url)
  File "C:\Python22\Lib\urllib.py", line 944, in splithost
    match = _hostprog.match(url)
TypeError: expected string or buffer

If the Win32 proxy is removed, it resumes working. In
urllib splithost, url is None or an empty tuple
(instead of the actual url.)

To reproduce, just enable a proxy on Win32 and execute
the "urllib.py -t" selftest. Disable the proxy and it
will be restored.

I haven't got the setup to check if web_proxy or
ftp_proxy on Posix machines causes the same problem.

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This is _NOT_ a bug under Linux Python 2.2--it works just
fine there. (Makes me curious why it would behave
differently under Windows, but I'm not sure where to look yet.)

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<bold>Is this bold?</bold>

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Medberry, can you see if the patch from SF bug 503031
(http://www.python.org/sf/503031) solves your problem?

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Problem is that open_ftp() does not check if the "url"
argument is a string or a tuple.  When ftp_proxy is set it
is a tuple, thus always causes the open() call to fail. 
This is not specific for Win32.

open_http() starts with this check:
       if type(url) is types.StringType:
open_ftp() should do something similar.

This is unrelated to bug 503031.

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Please, could you verify if this problem persists in Python 2.3.4
or 2.4?

If yes, in which version? Can you provide a test case?

If the problem is solved, from which version?

Note that if you fail to answer in one month, I'll close this bug
as "Won't fix".

Thank you! 

.    Facundo

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Deprecated. Reopen only if still happens in 2.3 or newer. 

.    Facundo