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Python Socket Programming

Socket programming is a way of connecting two nodes on a network to communicate with each other. One socket (node) listens on a particular port at an IP, while the other socket reaches out to the other to form a connection.

Importing the Module

import socket

Creating a Socket

To create a socket, you use the socket.socket() function.

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

Server Implementation

A server has a bind() method which binds it to a specific IP and port so that it can listen to incoming requests on that IP and port.

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()
    print(f"Listening on {HOST}:{PORT}")
    conn, addr = s.accept()
    with conn:
        print(f"Connected by {addr}")
        while True:
            data = conn.recv(1024)
            if not data:
                break
            conn.sendall(data)

Client Implementation

A client connects to the server using the connect() method.

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(f"Received {data!r}")

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Created: March 17, 2026 • Last Modified: January 27, 2026