You are using pip version 9.0.3, however version 20.3.1 is available. You should consider upgrading

1.先升級：

pip3 install --index-url https://pypi.tuna.tsinghua.edu.cn/simple --upgrade pip

如果在遇到像這種超時的錯誤：

Traceback (most recent call last):
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/urllib3/response.py", line 438, in _error_catcher
    yield
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/urllib3/response.py", line 519, in read
    data = self._fp.read(amt) if not fp_closed else b""
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/cachecontrol/filewrapper.py", line 62, in read
    data = self.__fp.read(amt)
  File "/usr/local/python3/lib/python3.6/http/client.py", line 449, in read
    n = self.readinto(b)
  File "/usr/local/python3/lib/python3.6/http/client.py", line 493, in readinto
    n = self.fp.readinto(b)
  File "/usr/local/python3/lib/python3.6/socket.py", line 586, in readinto
    return self._sock.recv_into(b)
  File "/usr/local/python3/lib/python3.6/ssl.py", line 1009, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/local/python3/lib/python3.6/ssl.py", line 871, in read
    return self._sslobj.read(len, buffer)
  File "/usr/local/python3/lib/python3.6/ssl.py", line 631, in read
    v = self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/cli/base_command.py", line 224, in _main
    status = self.run(options, args)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/cli/req_command.py", line 180, in wrapper
    return func(self, options, args)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 321, in run
    reqs, check_supported_wheels=not options.target_dir
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 122, in resolve
    requirements, max_rounds=try_to_avoid_resolution_too_deep,
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/resolvelib/resolvers.py", line 445, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/resolvelib/resolvers.py", line 339, in resolve
    failure_causes = self._attempt_to_pin_criterion(name, criterion)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/resolvelib/resolvers.py", line 207, in _attempt_to_pin_criterion
    criteria = self._get_criteria_to_update(candidate)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/resolvelib/resolvers.py", line 198, in _get_criteria_to_update
    for r in self._p.get_dependencies(candidate):
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/resolution/resolvelib/provider.py", line 172, in get_dependencies
    for r in candidate.iter_dependencies(with_requires)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/resolution/resolvelib/provider.py", line 171, in <listcomp>
    r
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 257, in iter_dependencies
    requires = self.dist.requires() if with_requires else ()
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 239, in dist
    self._prepare()
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 226, in _prepare
    dist = self._prepare_distribution()
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/resolution/resolvelib/candidates.py", line 319, in _prepare_distribution
    self._ireq, parallel_builds=True,
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 480, in prepare_linked_requirement
    return self._prepare_linked_requirement(req, parallel_builds)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 505, in _prepare_linked_requirement
    self.download_dir, hashes,
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 257, in unpack_url
    hashes=hashes,
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 130, in get_http_url
    from_path, content_type = download(link, temp_dir.path)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/network/download.py", line 163, in __call__
    for chunk in chunks:
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/cli/progress_bars.py", line 168, in iter
    for x in it:
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_internal/network/utils.py", line 88, in response_chunks
    decode_content=False,
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/urllib3/response.py", line 576, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/urllib3/response.py", line 541, in read
    raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
  File "/usr/local/python3/lib/python3.6/contextlib.py", line 99, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/local/python3/lib/python3.6/site-packages/pip/_vendor/urllib3/response.py", line 443, in _error_catcher
    raise ReadTimeoutError(self._pool, None, "Read timed out.")
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.

出現這種情況實際是因為國外的網站訪問限速，所以會一直報錯timeout，可以用參數延長timeout也可以換源。如果你也遇到同樣的情況，可以試一試用這個命令來安裝所需要的第三方庫：pip3 install --index-url https://pypi.douban.com/simple xxxx。或者使用pip install -i https://pypi.tuna.tsinghua.edu.cn/simple xxxx 從清華鏡像獲取庫。
2.使用清華的鏡像重新試：

pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple virtualenv

在這里插入圖片描述
正確下載！！！
常見pip下載鏡像：
阿里：https://mirrors.aliyun.com/pypi/simple
清華：https://pypi.tuna.tsinghua.edu.cn/simple
中國科學技術大學：https://pypi.mirrors.ustc.edu.cn/simple
參考：完美解決：You are using pip version 19.0.3, however version 20.0.2 is available…問題

本文鏈接：https://blog.csdn.net/qq_34663267/article/details/111464999

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