WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
pip安装数据包时提示上面的错误信息，原因是电脑未安装OPENSSL.
https://slproweb.com/products/Win32OpenSSL.html
下载 Win64 OpenSSL v1.1.1g Light EXE或者MSI安装即可。
来源：oschina
链接：https://my.oschina.net/u/4228078/blog/4328126