The first two are frameworks, the third is:

def serve(p: int, f):
    s = socket.socket()
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # let me reset plz
    s.bind(("", p))
    s.listen()
    while True:
        c, a = s.accept()
        c.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
        t = threading.Thread(target=serve0, args=(c, a, f))
        t.daemon = True
        t.start()

I have an entire file of some really cursed malicious compliance code for when I was brutally forced to write Python.