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I am trying to install Scikit-learn in Ubuntu 16.04, but there is an error when I am trying to install. I had successfully installed following packages

• Python 2.7.12


• NumPy 1.11.0


• SciPy 0.17.0

But the output of the command pip install -U scikit-learn is

Collecting scikit-learn

Exception:

Traceback (most recent call last):

  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 209, in main

    status = self.run(options, args)

  File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 328, in run

    wb.build(autobuilding=True)

  File "/usr/lib/python2.7/dist-packages/pip/wheel.py", line 748, in build

    self.requirement_set.prepare_files(self.finder)

  File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 360, in prepare_files

    ignore_dependencies=self.ignore_dependencies))

  File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 512, in _prepare_file

    finder, self.upgrade, require_hashes)

  File "/usr/lib/python2.7/dist-packages/pip/req/req_install.py", line 273, in populate_link

    self.link = finder.find_requirement(self, upgrade)

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 442, in find_requirement

    all_candidates = self.find_all_candidates(req.name)

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 400, in find_all_candidates

    for page in self._get_pages(url_locations, project_name):

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 545, in _get_pages

    page = self._get_page(location)

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 648, in _get_page

    return HTMLPage.get_page(link, session=self.session)

  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 757, in get_page

    "Cache-Control": "max-age=600",

  File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/sessions.py", line 480, in get

    return self.request('GET', url, **kwargs)

  File "/usr/lib/python2.7/dist-packages/pip/download.py", line 378, in request

    return super(PipSession, self).request(method, url, *args, **kwargs)

  File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/sessions.py", line 468, in request

    resp = self.send(prep, **send_kwargs)

  File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/sessions.py", line 576, in send

    r = adapter.send(request, **kwargs)

  File "/usr/share/python-wheels/CacheControl-0.11.5-py2.py3-none-any.whl/cachecontrol/adapter.py", line 46, in send

    resp = super(CacheControlAdapter, self).send(request, **kw)

  File "/usr/share/python-wheels/requests-2.9.1-py2.py3-none-any.whl/requests/adapters.py", line 376, in send

    timeout=timeout

  File "/usr/share/python-wheels/urllib3-1.13.1-py2.py3-none-any.whl/urllib3/connectionpool.py", line 610, in urlopen

    _stacktrace=sys.exc_info()[2])

  File "/usr/share/python-wheels/urllib3-1.13.1-py2.py3-none-any.whl/urllib3/util/retry.py", line 228, in increment

    total -= 1

TypeError: unsupported operand type(s) for -=: 'Retry' and 'int'

What can I do to solve this problem? Thank you in advance.

This error may be because you are behind a proxy. Try to connect to a network without proxy (e.g. your home), unset proxy environment variables:

unset http_proxy, unset http_proxy, unset HTTP_PROXY, unset HTTPS_PROXY

Then run your command again.

pip install -U scikit-learn


I think you should change pip to pip2.7, because, in Ubuntu 16.04, the pip function is considered to be pip3 (for python3):

pip2.7 install -U scikit-learn