Terry J. Reedy added the comment:
The presence of "During handling of the above exception, another exception
occurred:" is part of an intentional change between 2.x and 3.x. Exception
handling has been tweaked a bit more in the past year. 3.2.3 only gives the
second half of the traceback, which I suppose is worse.
In 3.3.0, the exception raising an exception behavior is fixed for this
particular input on my Win 7 system.
>>> import urllib.request
>>> urllib.request.urlretrieve('missing')
Traceback (most recent call last):
File "<pyshell#1>", line 1, in <module>
urllib.request.urlretrieve('missing')
File "C:\Programs\Python33\lib\urllib\request.py", line 185, in urlretrieve
with contextlib.closing(urlopen(url, data)) as fp:
File "C:\Programs\Python33\lib\urllib\request.py", line 160, in urlopen
return opener.open(url, data, timeout)
File "C:\Programs\Python33\lib\urllib\request.py", line 458, in open
req = Request(fullurl, data)
File "C:\Programs\Python33\lib\urllib\request.py", line 279, in __init__
self._parse()
File "C:\Programs\Python33\lib\urllib\request.py", line 284, in _parse
raise ValueError("unknown url type: %s" % self.full_url)
ValueError: unknown url type: missing
urlretrieve no longer assumes the file: scheme. (It was never documented to do
so, and there is no good reason to do so.) If given explicitly with an invalid
name, it gives the current equivalent of the 2.x error and message.
>>> urllib.request.urlretrieve('file:missing')
...
urllib.error.URLError: <urlopen error [WinError 2] The system cannot find the
file specified: 'missing'>
Nonetheless, this 3 arg call should be fixed
1887 except OSError as e:
1888 raise URLError(e.errno, e.strerror, e.filename)
----------
nosy: +terry.reedy
title: regression: TypeError during exception handling in
urllib.request.urlretrieve -> urllib.request.urlretrieve calls URLError with 3
args
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<http://bugs.python.org/issue10836>
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