API example:

>>> import ssl

>>> chain = ssl.Certificate.chain_from_file("Lib/test/ssl_cert.pem")
>>> cas = ssl.Certificate.bundle_from_file("Lib/test/pycacert.pem")
>>> pkey = ssl.PrivateKey.from_file("Lib/test/ssl_key.passwd.pem")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ssl.SSLError: [PEM: BAD_PASSWORD_READ] bad password read (_ssl.c:58)
>>> pkey = ssl.PrivateKey.from_file("Lib/test/ssl_key.passwd.pem", password="somepass")

>>> chain
(<_ssl.Certificate '/C=XY/L=Castle Anthrax/O=Python Software Foundation/CN=localhost'>,)
>>> cas
[<_ssl.Certificate '/C=XY/O=Python Software Foundation CA/CN=our-ca-server'>]

>>> ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
>>> ctx.load_cert_chain(chain, pkey)
>>> ctx.load_verify_locations(cadata=cas)