我对pip有点问题，尝试使用以下命令安装mopidy-Iris：
sudo pip install Mopidy-Iris
以前可以使用，但是在卸载并重新安装后，出现以下错误：
Collecting Mopidy-Iris
Exception:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 353, in run
wb.build(autobuilding=True)
File "/usr/lib/python2.7/dist-packages/pip/wheel.py", line 749, in build
self.requirement_set.prepare_files(self.finder)
File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 554, in _prepare_file
require_hashes
File "/usr/lib/python2.7/dist-packages/pip/req/req_install.py", line 278, in populate_link
self.link = finder.find_requirement(self, upgrade)
File "/usr/lib/python2.7/dist-packages/pip/index.py", line 465, in find_requirement
all_candidates = self.find_all_candidates(req.name)
File "/usr/lib/python2.7/dist-packages/pip/index.py", line 423, 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 568, in _get_pages
page = self._get_page(location)
File "/usr/lib/python2.7/dist-packages/pip/index.py", line 683, in _get_page
return HTMLPage.get_page(link, session=self.session)
File "/usr/lib/python2.7/dist-packages/pip/index.py", line 792, in get_page
"Cache-Control": "max-age=600",
File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 501, in get
return self.request('GET', url, **kwargs)
File "/usr/lib/python2.7/dist-packages/pip/download.py", line 386, in request
return super(PipSession, self).request(method, url, *args, **kwargs)
File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 488, in request
resp = self.send(prep, **send_kwargs)
File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 630, in send
history = [resp for resp in gen] if allow_redirects else []
File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 190, in resolve_redirects
**adapter_kwargs
File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/sessions.py", line 609, in send
r = adapter.send(request, **kwargs)
File "/usr/share/python-wheels/CacheControl-0.11.7-py2.py3-none-any.whl/cachecontrol/adapter.py", line 47, in send
resp = super(CacheControlAdapter, self).send(request, **kw)
File "/usr/share/python-wheels/requests-2.12.4-py2.py3-none-any.whl/requests/adapters.py", line 423, in send
timeout=timeout
File "/usr/lib/python2.7/dist-packages/urllib3/connectionpool.py", line 643, in urlopen
_stacktrace=sys.exc_info()[2])
File "/usr/lib/python2.7/dist-packages/urllib3/util/retry.py", line 315, in increment
total -= 1
TypeError: unsupported operand type(s) for -=: 'Retry' and 'int'
我在运行以下命令以使其正常运行时看到了建议，但通过运行以下命令，我得到与上述完全相同的错误：
sudo python -m pip install --upgrade --force setuptools
sudo python -m pip install --upgrade --force pip
除此之外，我正在Raspberry pi上构建它，它通过运行诸如sudo apt-get update我得到的简单命令来获得
Err:1 http://apt.mopidy.com jessie InRelease
Temporary failure resolving 'apt.mopidy.com'
Err:2 https://dev2day.de/pms jessie InRelease
Could not resolve host: dev2day.de
Err:3 http://archive.raspberrypi.org/debian stretch InRelease
Temporary failure resolving 'archive.raspberrypi.org'
Err:4 http://mirrordirector.raspbian.org/raspbian stretch InRelease
Temporary failure resolving 'mirrordirector.raspbian.org'
Reading package lists... Done
W: Failed to fetch http://mirrordirector.raspbian.org/raspbian/dists/stretch/InRelease Temporary failure resolving 'mirrordirector.raspbian.org'
W: Failed to fetch http://apt.mopidy.com/dists/jessie/InRelease Temporary failure resolving 'apt.mopidy.com'
W: Failed to fetch https://dev2day.de/pms/dists/jessie/InRelease Could not resolve host: dev2day.de
W: Failed to fetch http://archive.raspberrypi.org/debian/dists/stretch/InRelease Temporary failure resolving 'archive.raspberrypi.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.
任何人都可能已经看过这个，也许知道该怎么做？