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Pip, but error installing any package

pip is installed on my system, but whenever I try to install a package, it throws an exception below. The same exception occurs when installing each package. I could not find it anywhere on the Internet. Please, help.

pip install django-social-auth
Downloading/unpacking django-social-auth
Cleaning up...
Exception:
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/basecommand.py", line 122, in main
   status = self.run(options, args)
  File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/commands/install.py", line 274, in run
   requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/req.py", line 1166, in prepare_files
   url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
 File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/index.py", line 194, in find_requirement
  page = self._get_page(main_index_url, req)
 File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/index.py", line 568, in _get_page
  session=self.session,
 File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/index.py", line 670, in get_page
   resp = session.get(url, headers={"Accept": "text/html"})
 File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/_vendor/requests/sessions.py", line 395, in get
   return self.request('GET', url, **kwargs)
 File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/download.py", line 237, in request
   return super(PipSession, self).request(method, url, *args, **kwargs)
  File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/_vendor/requests/sessions.py", line 356, in request
    env_proxies = get_environ_proxies(url) or {}
  File "/Library/Python/2.7/site-packages/pip-1.5.2-py2.7.egg/pip/_vendor/requests/utils.py", line 504, in get_environ_proxies
    bypass = proxy_bypass(netloc)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 1433, in proxy_bypass
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 1413, in proxy_bypass_macosx_sysconf
ValueError: negative shift count
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3 answers

The module urllibused pipwill automatically download the proxy server configuration from your OS.

In this case, this fails because you have encountered an incorrect proxy server configuration in the proxy bypass field. Verify that the proxy server is configured correctly. On a Mac, do this under System Preferences> Network.

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-. . ---- .

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@Martijn Pieters , " -".

Try deleting the addresses in this field, click "Apply Changes" and try again.

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