ubuntu下pip install的问题

利用一个require安装依赖环境$pip install requests报错信息：
Collecting requestsException: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.se
fff5
nd(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 -= 1TypeError: unsupported operand type(s) for -=: 'Retry' and 'int'

解决方法：apt-get remove python-pip python3-pip
wget https://bootstrap.pypa.io/get-pip.py python get-pip.py
python3 get-pip.py