run.sh

#!/bin/bash

echo "
rdr pass inet proto tcp from any to any port 6000 -> 127.0.0.1 port 8080
" | sudo pfctl -ef -

s.py

#!/usr/bin/env python3

import socket
s = socket.socket()
s.bind(("127.0.0.1", 8080))
s.listen(1024)
for sock in s.accept():
    print(sock)

test.sh

#!/bin/bash

curl "127.0.0.1:6000"