import socket
import random

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = "127.0.0.1"
port = 9999 + random.randint(0, 1000)
print("port:", port)
server.bind((host, port))
server.listen(5)

client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect((host, port))

accept, addr = server.accept()

print("recv from client: %s" % str(addr))

client.send("send test from client".encode())
print("server recv:", accept.recv(1024).decode())

accept.send("send test from server".encode())
print("client recv:", client.recv(1024).decode())

accept.close()
client.close()
server.close()