gistfile1.py

import socket
import gevent
from gevent.pywsgi import WSGIServer

addrs = socket.getaddrinfo('::1', 8000, socket.AF_INET6, 0, socket.SOL_TCP)
bind_spec = addrs[0][-1]

listener = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
listener.bind(bind_spec)

server = WSGIServer(
    listener,
    lambda a,b:'asd'
)

server.serve_forever()