获取网站的ssl证书信息
import ssl
import socket
import pprint
hostname = 'www.baidu.com'
c = ssl.create_default_context()
s = c.wrap_socket(socket.socket(), server_hostname=hostname)
s.connect((hostname, 443))
cert = s.getpeercert()
pprint.pprint(cert)
print(cert.get('notAfter'))
print(cert.get('notBefore'))