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Setsockopt

As explained in Python Concurrency with asyncio

setsockopt is a socket API operation that changes an option on a socket.

setsockopt changes an option on a socket. In a TCP server, setting SO_REUSEADDR to 1 allows the server to reuse its port after stopping and restarting, avoiding address-already-in-use errors. section 3.1

Allowing a server to reuse its port

Create an IPv4 TCP socket, then configure it before binding: server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1). The server can subsequently bind to 127.0.0.1:8000 and listen for clients. section 3.1

import socket
 
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

Shows the complete setsockopt call alongside socket creation, making the option’s placement in server setup easy to inspect. section 3.1

How Python Concurrency with asyncio covers it

How deep it goes
Defines the operation through one practical option and demonstrates its placement, without discussing socket-option internals.
Examples
Uses a Python IPv4 TCP server bound to 127.0.0.1:8000 and configured with SO_REUSEADDR.
What it assumes
Assumes basic socket creation and TCP knowledge while showing the option call within a complete server setup.
What you can do after
Operate/configure a TCP listening socket so restarting a server can reuse its port more readily.
How it connects
Connects socket options with socket creation, TCP, binding, listening, and SO_REUSEADDR.
Cover of Python Concurrency with asyncio
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