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If I try to download a inexistent file I get a TypeError which is thrown during exception handling.
>>> import urllib.request
>>> urllib.request.urlretrieve('missing')
Traceback (most recent call last):
 File "/usr/lib/python3.1/urllib/request.py", line 1705, in open_local_file
 stats = os.stat(localname)
OSError: [Errno 2] No such file or directory: 'missing'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib/python3.1/urllib/request.py", line 133, in urlretrieve
 return _urlopener.retrieve(url, filename, reporthook, data)
 File "/usr/lib/python3.1/urllib/request.py", line 1507, in retrieve
 fp = self.open_local_file(url1)
 File "/usr/lib/python3.1/urllib/request.py", line 1707, in open_local_file
 raise URLError(e.errno, e.strerror, e.filename)
TypeError: __init__() takes at most 3 positional arguments (4 given)