Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

In /Lib/test/test_urllib2_localnet.py there is an incorrect usage of 
unittest.TestCase.fail (an extra comma makes it use two arguments instead of 
one):

class BasicAuthTests(unittest.TestCase):
    ...

    def test_basic_auth_success(self):
        ...
        try:
            self.assertTrue(urllib.request.urlopen(self.server_url))
        except urllib.error.HTTPError:
            self.fail("Basic auth failed for the url: %s", self.server_url)

here self.fail takes two argument, but it only admits one. This produces this 
traceback if there are proxy issues when running the tests:

Traceback (most recent call last):
  File "/home7/pablogsal/Python-3.7.0/Lib/test/test_urllib2_localnet.py", line 
307, in test_basic_auth_success
    self.assertTrue(urllib.request.urlopen(self.server_url))
  File "/home/pablogsal/Python-3.7.0/Lib/urllib/request.py", line 222, in 
urlopen
    return opener.open(url, data, timeout)
  File "/home/pablogsal/Python-3.7.0/Lib/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/pablogsal/Python-3.7.0/Lib/urllib/request.py", line 641, in 
http_response
    'http', request, response, code, msg, hdrs)
  File "/home/pablogsal/Python-3.7.0/Lib/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/pablogsal/Python-3.7.0/Lib/urllib/request.py", line 503, in 
_call_chain
    result = func(*args)
  File "/home/pablogsal/Python-3.7.0/Lib/urllib/request.py", line 649, in 
http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pablogsal/Python-3.7.0/Lib/test/test_urllib2_localnet.py", line 
309, in test_basic_auth_success
    self.fail("Basic auth failed for the url: %s", self.server_url)
TypeError: fail() takes from 1 to 2 positional arguments but 3 were given

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34031>
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