安装scikit-learn

C:\Users\99>pip install -U scikit-learn
ERROR: Exception:
Traceback (most recent call last):
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\cli\base_command.py", line 173, in _main
    status = self.run(options, args)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\cli\req_command.py", line 203, in wrapper
    return func(self, options, args)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\commands\install.py", line 315, in run
    requirement_set = resolver.resolve(
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\resolution\resolvelib\resolver.py", line 94, in resolve
    result = self._result = resolver.resolve(
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 472, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 341, in resolve
    self._add_to_criteria(self.state.criteria, r, parent=None)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\resolvelib\resolvers.py", line 172, in _add_to_criteria
    if not criterion.candidates:
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\resolvelib\structs.py", line 151, in __bool__
    return bool(self._sequence)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 140, in __bool__
    return any(self)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 128, in 
    return (c for c in iterator if id(c) not in self._incompatible_ids)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 29, in _iter_built
    for version, func in infos:
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\resolution\resolvelib\factory.py", line 272, in iter_index_candidate_infos
    result = self._finder.find_best_candidate(
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\index\package_finder.py", line 851, in find_best_candidate
    candidates = self.find_all_candidates(project_name)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\index\package_finder.py", line 798, in find_all_candidates
    page_candidates = list(page_candidates_it)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\index\sources.py", line 134, in page_candidates
    yield from self._candidates_from_page(self._link)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\index\package_finder.py", line 758, in process_project_url
    html_page = self._link_collector.fetch_page(project_url)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\index\collector.py", line 490, in fetch_page
    return _get_html_page(location, session=self.session)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\index\collector.py", line 400, in _get_html_page
    resp = _get_html_response(url, session=session)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\index\collector.py", line 115, in _get_html_response
    resp = session.get(
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\requests\sessions.py", line 555, in get
    return self.request('GET', url, **kwargs)
  File "e:\python\python3.8.5\lib\site-packages\pip\_internal\network\session.py", line 454, in request
    return super().request(method, url, *args, **kwargs)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\requests\sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\requests\sessions.py", line 655, in send
    r = adapter.send(request, **kwargs)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\cachecontrol\adapter.py", line 53, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\requests\adapters.py", line 439, in send
    resp = conn.urlopen(
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 696, in urlopen
    self._prepare_proxy(conn)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\urllib3\connectionpool.py", line 964, in _prepare_proxy
    conn.connect()
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\urllib3\connection.py", line 359, in connect
    conn = self._connect_tls_proxy(hostname, conn)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\urllib3\connection.py", line 500, in _connect_tls_proxy
    return ssl_wrap_socket(
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 453, in ssl_wrap_socket
    ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls)
  File "e:\python\python3.8.5\lib\site-packages\pip\_vendor\urllib3\util\ssl_.py", line 495, in _ssl_wrap_socket_impl
    return ssl_context.wrap_socket(sock)
  File "e:\python\python3.8.5\lib\ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "e:\python\python3.8.5\lib\ssl.py", line 997, in _create
    raise ValueError("check_hostname requires server_hostname")
ValueError: check_hostname requires server_hostname

C:\Users\99>pip install numpy
Requirement already satisfied: numpy in e:\python\python3.8.5\lib\site-packages (1.21.2)
WARNING: You are using pip version 21.2.4; however, version 21.3.1 is available.
You should consider upgrading via the 'e:\python\python3.8.5\python.exe -m pip install --upgrade pip' command.

C:\Users\99>e:\python\python3.8.5\python.exe -m pip install --upgrade pip
Requirement already satisfied: pip in e:\python\python3.8.5\lib\site-packages (21.2.4)
Collecting pip
  Downloading pip-21.3.1-py3-none-any.whl (1.7 MB)
     |████████████████████████████████| 1.7 MB 939 kB/s
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 21.2.4
    Uninstalling pip-21.2.4:
      Successfully uninstalled pip-21.2.4
Successfully installed pip-21.3.1

C:\Users\99>pip install numpy
Requirement already satisfied: numpy in e:\python\python3.8.5\lib\site-packages (1.21.2)

C:\Users\99>pip install scipy
Collecting scipy
  Downloading scipy-1.7.3-cp38-cp38-win_amd64.whl (34.2 MB)
     |████████████████████████████████| 34.2 MB 6.8 MB/s
Requirement already satisfied: numpy<1.23.0,>=1.16.5 in e:\python\python3.8.5\lib\site-packages (from scipy) (1.21.2)
Installing collected packages: scipy
Successfully installed scipy-1.7.3

C:\Users\99>pip install matplotlib
Collecting matplotlib
  Downloading matplotlib-3.5.1-cp38-cp38-win_amd64.whl (7.2 MB)
     |████████████████████████████████| 7.2 MB 819 kB/s
Requirement already satisfied: numpy>=1.17 in e:\python\python3.8.5\lib\site-packages (from matplotlib) (1.21.2)
Collecting packaging>=20.0
  Downloading packaging-21.3-py3-none-any.whl (40 kB)
     |████████████████████████████████| 40 kB 2.6 MB/s
Collecting fonttools>=4.22.0
  Downloading fonttools-4.28.5-py3-none-any.whl (890 kB)
     |████████████████████████████████| 890 kB 2.2 MB/s
Collecting pillow>=6.2.0
  Downloading Pillow-8.4.0-cp38-cp38-win_amd64.whl (3.2 MB)
     |████████████████████████████████| 3.2 MB 6.8 MB/s
Collecting kiwisolver>=1.0.1
  Downloading kiwisolver-1.3.2-cp38-cp38-win_amd64.whl (52 kB)
     |████████████████████████████████| 52 kB 355 kB/s
Collecting cycler>=0.10
  Downloading cycler-0.11.0-py3-none-any.whl (6.4 kB)
Requirement already satisfied: python-dateutil>=2.7 in e:\python\python3.8.5\lib\site-packages (from matplotlib) (2.8.2)
Collecting pyparsing>=2.2.1
  Downloading pyparsing-3.0.6-py3-none-any.whl (97 kB)
     |████████████████████████████████| 97 kB 3.3 MB/s
Requirement already satisfied: six>=1.5 in e:\python\python3.8.5\lib\site-packages (from python-dateutil>=2.7->matplotlib) (1.16.0)
Installing collected packages: pyparsing, pillow, packaging, kiwisolver, fonttools, cycler, matplotlib
Successfully installed cycler-0.11.0 fonttools-4.28.5 kiwisolver-1.3.2 matplotlib-3.5.1 packaging-21.3 pillow-8.4.0 pyparsing-3.0.6

C:\Users\99>pip install scikit-learn
Collecting scikit-learn
  Downloading scikit_learn-1.0.2-cp38-cp38-win_amd64.whl (7.2 MB)
     |████████████████████████████████| 7.2 MB 21 kB/s
Requirement already satisfied: numpy>=1.14.6 in e:\python\python3.8.5\lib\site-packages (from scikit-learn) (1.21.2)
Collecting threadpoolctl>=2.0.0
  Downloading threadpoolctl-3.0.0-py3-none-any.whl (14 kB)
Collecting joblib>=0.11
  Downloading joblib-1.1.0-py2.py3-none-any.whl (306 kB)
     |████████████████████████████████| 306 kB 30 kB/s
Requirement already satisfied: scipy>=1.1.0 in e:\python\python3.8.5\lib\site-packages (from scikit-learn) (1.7.3)
Installing collected packages: threadpoolctl, joblib, scikit-learn
Successfully installed joblib-1.1.0 scikit-learn-1.0.2 threadpoolctl-3.0.0