I was going to install pandas and epanettools on my computer using the code shown below with python 3.8.5 and I received one Error exception.
Code:
pip install epanettools pip install pandas
Actually, I could install epanettools on my old computer and I bought a new computer and I wanted to do the same thing on my new computer, but it didn’t work and the error exception shown below after running the code shown above:
Error: Exception:
ERROR: Exception: Traceback (most recent call last): File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalclibase_command.py", line 180, in _main status = self.run(options, args) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalclireq_command.py", line 204, in wrapper return func(self, options, args) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalcommandsinstall.py", line 318, in run requirement_set = resolver.resolve( File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibresolver.py", line 127, in resolve result = self._result = resolver.resolve( File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 473, in resolve state = resolution.resolve(requirements, max_rounds=max_rounds) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 341, in resolve name, crit = self._merge_into_criterion(r, parent=None) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibresolvers.py", line 172, in _merge_into_criterion if not criterion.candidates: File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorresolvelibstructs.py", line 139, in __bool__ return bool(self._sequence) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 143, in __bool__ return any(self) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 129, in <genexpr> return (c for c in iterator if id(c) not in self._incompatible_ids) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfound_candidates.py", line 30, in _iter_built for version, func in infos: File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalresolutionresolvelibfactory.py", line 258, in iter_index_candidate_infos result = self._finder.find_best_candidate( File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 879, in find_best_candidate candidates = self.find_all_candidates(project_name) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 824, in find_all_candidates page_candidates = list(page_candidates_it) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexsources.py", line 134, in page_candidates yield from self._candidates_from_page(self._link) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexpackage_finder.py", line 783, in process_project_url html_page = self._link_collector.fetch_page(project_url) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 512, in fetch_page return _get_html_page(location, session=self.session) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 422, in _get_html_page resp = _get_html_response(url, session=session) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalindexcollector.py", line 120, in _get_html_response resp = session.get( File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 555, in get return self.request('GET', url, **kwargs) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_internalnetworksession.py", line 449, in request return super().request(method, url, *args, **kwargs) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 542, in request resp = self.send(prep, **send_kwargs) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestssessions.py", line 655, in send r = adapter.send(request, **kwargs) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorcachecontroladapter.py", line 53, in send resp = super(CacheControlAdapter, self).send(request, **kw) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorrequestsadapters.py", line 439, in send resp = conn.urlopen( File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connectionpool.py", line 696, in urlopen self._prepare_proxy(conn) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connectionpool.py", line 964, in _prepare_proxy conn.connect() File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connection.py", line 359, in connect conn = self._connect_tls_proxy(hostname, conn) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3connection.py", line 500, in _connect_tls_proxy return ssl_wrap_socket( File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3utilssl_.py", line 432, in ssl_wrap_socket ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls) File "c:usersziyuanappdatalocalprogramspythonpython38libsite-packagespip_vendorurllib3utilssl_.py", line 474, in _ssl_wrap_socket_impl return ssl_context.wrap_socket(sock) File "c:usersziyuanappdatalocalprogramspythonpython38libssl.py", line 500, in wrap_socket return self.sslsocket_class._create( File "c:usersziyuanappdatalocalprogramspythonpython38libssl.py", line 997, in _create raise ValueError("check_hostname requires server_hostname") ValueError: check_hostname requires server_hostname
Could you please tell me how to resolve this error? Appreicate a lot if any advices!
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Answer
Are you using proxy software, like V2ray, SSR…?
If so, close the software, and try again.