Socket Programming

Introduce

Python의 소켓 모듈 은 Berkeley 소켓 API에 대한 인터페이스를 제공합니다.

Socket API List

• socket()
• bind()
• listen()
• accept()
• connect()
• connect_ex()
• send()
• recv()
• close()

Echo Server & Client Example

echo-server.py ```python echo-server.py

!/usr/bin/env python3

import socket

HOST = '127.0.0.1' # Standard loopback interface address (localhost) PORT = 65432 # Port to listen on (non-privileged ports are > 1023)

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: s.bind((HOST, PORT)) s.listen() conn, addr = s.accept() with conn: print('Connected by', addr) while True: data = conn.recv(1024) if not data: break conn.sendall(data)

echo-client.py
```python echo-client.py
import socket

HOST = '127.0.0.1'  # The server's hostname or IP address
PORT = 65432        # The port used by the server

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    s.sendall(b'Hello, world')
    data = s.recv(1024)

print('Received', repr(data))

TCP Socket

socket.socket ()을 사용하여 소켓 객체를 만들고 소켓 유형을 socket.SOCK_STREAM으로 지정합니다.
기본 프로토콜은 TCP (Transmission Control Protocol)입니다.

References

• https://realpython.com/python-sockets/
• https://en.wikipedia.org/wiki/Berkeley_sockets