安装命令：
pip install epanettools
pip install pandas
异常错误：
ERROR: Exception:Traceback (most recent call last): File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\cli\base_command.py", line 180, in _main status = self.run(options, args) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\cli\req_command.py", line 204, in wrapper return func(self, options, args) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\commands\install.py", line 318, in run requirement_set = resolver.resolve( File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 127, in resolve result = self._result = resolver.resolve( File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 473, in resolve state = resolution.resolve(requirements, max_rounds=max_rounds) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 341, in resolve name, crit = self._merge_into_criterion(r, parent=None) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 172, in _merge_into_criterion if not criterion.candidates: File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\resolvelib\structs.py", line 139, in __bool__ return bool(self._sequence) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 143, in __bool__ return any(self) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 129, inreturn (c for c in iterator if id(c) not in self._incompatible_ids) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 30, in _iter_built for version, func in infos: File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 258, in iter_index_candidate_infos result = self._finder.find_best_candidate( File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\index\package_finder.py", line 879, in find_best_candidate candidates = self.find_all_candidates(project_name) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\index\package_finder.py", line 824, in find_all_candidates page_candidates = list(page_candidates_it) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\index\sources.py", line 134, in page_candidates yield from self._candidates_from_page(self._link) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\index\package_finder.py", line 783, in process_project_url html_page = self._link_collector.fetch_page(project_url) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\index\collector.py", line 512, in fetch_page return _get_html_page(location, session=self.session) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\index\collector.py", line 422, in _get_html_page resp = _get_html_response(url, session=session) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\index\collector.py", line 120, in _get_html_response resp = session.get( File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\requests\sessions.py", line 555, in get return self.request('GET', url, **kwargs) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_internal\network\session.py", line 449, in request return super().request(method, url, *args, **kwargs) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\requests\sessions.py", line 542, in request resp = self.send(prep, **send_kwargs) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\requests\sessions.py", line 655, in send r = adapter.send(request, **kwargs) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\cachecontrol\adapter.py", line 53, in send resp = super(CacheControlAdapter, self).send(request, **kw) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\requests\adapters.py", line 439, in send resp = conn.urlopen( File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 696, in urlopen self._prepare_proxy(conn) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 964, in _prepare_proxy conn.connect() File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\urllib3\connection.py", line 359, in connect conn = self._connect_tls_proxy(hostname, conn) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\urllib3\connection.py", line 500, in _connect_tls_proxy return ssl_wrap_socket( File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 432, in ssl_wrap_socket ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 474, in _ssl_wrap_socket_impl return ssl_context.wrap_socket(sock) File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\ssl.py", line 500, in wrap_socket return self.sslsocket_class._create( File "c:\users\ziyuan\appdata\local\programs\python\python38\lib\ssl.py", line 997, in _create raise ValueError("check_hostname requires server_hostname")ValueError: check_hostname requires server_hostname
问题原因及解决方法：
出错原因是使用了代理上网软件导致，关闭代理即可以解决。
或者
Linux环境下，可以通过将代理设置环境变量export https_proxy=http://123.123.123.123:8888中的https替换为http来解决此问题。注意，它是https的代理设置，但使用的是http地址。