对于Windows 10下的Miniconda3, python=3.7.5，我尝试了以上所有建议;毫无效果。我不得不降级到python=3.7.0，这解决了这个问题

conda install python=3.7.0

显然这很混乱。答案表明升级到3.8.5也可以工作，但这在我的环境中有太多的副作用。

我遇到了这个问题!我不小心安装了32位版本的Miniconda3。确保你选择的是64位版本!

Windows 10, Windows 7 如果pip install在CMD提示符下不工作，使用Anaconda提示符运行它-它工作。

https://github.com/pypa/virtualenv/issues/1139

目前在Windows 10上的Anaconda提示符(Anaconda3)也有同样的问题。这里是解决方案:https://github.com/ContinuumIO/anaconda-issues/issues/10576

你可以尝试brew链接，它会告诉你正确的说明:

$ brew link openssl --force
Warning: Refusing to link macOS provided/shadowed software: openssl@1.1
If you need to have openssl@1.1 first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl@1.1/bin:$PATH"' >> ~/.zshrc

For compilers to find openssl@1.1 you may need to set:
  export LDFLAGS="-L/usr/local/opt/openssl@1.1/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl@1.1/include"

For pkg-config to find openssl@1.1 you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/openssl@1.1/lib/pkgconfig"

我得到了同样的错误:

WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/pb-tool/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/pb-tool/
ERROR: Operation cancelled by user
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping

在《Anaconda》中，我使用了以下命令:

conda install anaconda-navigator

本文中提到:pip配置了需要TLS/SSL的位置，但是Python中的SSL模块不可用