python 解决 SNIMissingWarning 和 InsecurePlatformWarning 警告

python 解决 SNIMissingWarning 和 InsecurePlatformWarning 警告

在想要获取 https 站点的资源时，会报出 SNIMissingWarning 和 InsecurePlatformWarning 警告

SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. 

This may cause the server to present an incorrect TLS certificate, which can cause validation failures. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#snimissingwarning.
  SNIMissingWarning
 A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning 

解决方法：

在 cmd 中输入：

pip install pyopenssl ndg-httpsclient pyasn1