#How to use python pwnserver.py [EXECUTABLE FILE PATH] [PORT]
$ python /media/sf_CTF/pwn_practice_server/pwn_server.py echo 9007
Pwnable server starts...
Host: localhost
Port: 9007
Target: echo
Received:aaa
Sent: aaa
Maybe, using this command is better.
$ socat TCP-LISTEN:9007,reuseaddr,fork exec:./binary&