Python套接字仅接受本地连接。

import socket

host = \"\"
port = 4242
backlog = 5
size = 1024
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host,port))
s.listen(backlog)
client, address = s.accept()
while 1:

    data = client.recv(size)
    if data:
        client.send(data)
        print(data.decode(\"utf-8\"))

import socket
import sys

host = sys.argv[1]
port = 4242
size = 1024

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host,port))
while True:
    line = input(\"What to say: \")
    s.send(line.encode(\"utf-8\"))