Martin Panter added the comment:

Steve and/or Raniere: I suspect this is the same problem as mentioned in the 
giant comment, Issue 17564. In other words, it is probably your ISP or DNS 
which is broken, not Python.

However, rather than expecting everyone to automatically read the giant wall of 
comment in the source code, perhaps we could improve the failure message:

with self.assertRaises(OSError,
        msg="Perhaps your ISP hijacked the DNS request; "
        "see the source code comments"):
    # Giant comment
    urllib.request.urlopen(...)

Then the failure would look like this:

AssertionError: OSError not raised : Perhaps your ISP hijacked the DNS request; 
see the source code comments

----------
nosy: +martin.panter

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23788>
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