sudo pip install  pyro4
Collecting pyro4
  Downloading 
https://files.pythonhosted.org/packages/70/e3/8c4e0d24b46fbf02e6b2dc2da5d18f0c73cfd343a1fb01ae64c788c20e56/Pyro4-4.82-py2.py3-none-any.whl
 (89kB)
    100% |████████████████████████████████| 92kB 7.3MB/s 
Collecting selectors34; python_version < "3.4" (from pyro4)
  Downloading 
https://files.pythonhosted.org/packages/13/25/4f4fa70ab23ad6263fe59cedf9dcd3ef71aa7f99c556c5e4c6435829e22d/selectors34-1.2-py2.py3-none-any.whl
Collecting serpent<1.30,>=1.27; python_version < "3.2" (from pyro4)
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 492, 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 480, 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 588, 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 238, in increment
    total -= 1
TypeError: unsupported operand type(s) for -=: 'Retry' and 'int'
You are using pip version 8.1.1, however version 22.2.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.



I tried removing pip and reinstalling it again.

still facing same issue.
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