如何修复“由于 EnvironmentError：HTTPSConnectionPool 无法安装软件包”错误？答案

【问题标题】：How to fix "Could not install packages due to an EnvironmentError: HTTPSConnectionPool" error?如何修复“由于 EnvironmentError：HTTPSConnectionPool 无法安装软件包”错误？
【发布时间】：2019-09-05 09:17:14
【问题描述】：

我正在尝试安装 jupyterthemes 包并收到此错误。

Collecting jupyterthemes
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /packages/8a/08/9dee6dfd7f2aad6c30282d55c8f495b4dc1e4747b4e2bdbeb80572ddf312/jupyterthemes-0.20.0-py2.py3-none-any.whl
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /packages/8a/08/9dee6dfd7f2aad6c30282d55c8f495b4dc1e4747b4e2bdbeb80572ddf312/jupyterthemes-0.20.0-py2.py3-none-any.whl
  Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /packages/8a/08/9dee6dfd7f2aad6c30282d55c8f495b4dc1e4747b4e2bdbeb80572ddf312/jupyterthemes-0.20.0-py2.py3-none-any.whl
  Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /packages/8a/08/9dee6dfd7f2aad6c30282d55c8f495b4dc1e4747b4e2bdbeb80572ddf312/jupyterthemes-0.20.0-py2.py3-none-any.whl
  Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /packages/8a/08/9dee6dfd7f2aad6c30282d55c8f495b4dc1e4747b4e2bdbeb80572ddf312/jupyterthemes-0.20.0-py2.py3-none-any.whl
Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/8a/08/9dee6dfd7f2aad6c30282d55c8f495b4dc1e4747b4e2bdbeb80572ddf312/jupyterthemes-0.20.0-py2.py3-none-any.whl (Caused by ProtocolError('Connection aborted.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None)))

【问题讨论】：

你似乎在代理后面运行 pip，如果是这样运行pip --proxy "put proxy here" install jupyterthemes

标签： python python-3.x pip

【解决方案1】：

您似乎需要添加受信任的主机。

检查this GitHub线程。

类似：

sudo pip install --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org --upgrade --proxy=127.0.0.1:3128 jupyterthemes

【讨论】：

【解决方案2】：

请检查日期是否设置正确。通常当时间和日期与服务器的不同时会弹出此错误。

【讨论】：

【解决方案3】：

尝试设置代理

set http_proxy=http://proxy.myproxy.com
set https_proxy=https://proxy.myproxy.com
python get-pip.py

【讨论】：

【解决方案4】：

我认为有些软件包需要使用管理员权限安装在 mac 上试试这个：

sudo pip install

在窗口上：

您必须以管理员身份运行 cmd。我的意思是右键单击cmd，选择

以管理员身份运行然后 pip install pkg 名称

【讨论】：

【解决方案5】：

对我来说，这是由于网络防火墙设置造成的，请尝试连接到任何其他网络并运行命令。它对我有用。

【讨论】：