Python's web servers were formerly reachable from IPv6 clients, as evidenced by this example code for socket.getaddrinfo():

https://docs.python.org/3/library/socket.html#socket.getaddrinfo

But today, www.python.org is IPv4-only:

>>> import socket
>>> socket.getaddrinfo("www.python.org", 80, proto=socket.IPPROTO_TCP)
[(<AddressFamily.AF_INET: 2>, <SocketType.SOCK_STREAM: 1>, 6, '', ('23.235.40.223', 80))]

Please either restore IPv6 connectivity to www.python.org, or accept the shame and defeat of pointing the documentation to someone else's domain.