如何使用python检索远程主机的TLS / SSL对等证书？

I need to scan through a list of IPs and retrieve the common name from the certificate on that IP (for every IP that allows port 443 connections). I have been able to successfully do this using the sockets and ssl modules. It works for all IPs with valid, signed certificates but it isn't working for self-signed certificates.I need to scan through a list of IPs and retrie