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Socket.listen

As explained in Python Concurrency with asyncio

socket.listen changes a socket into a listening endpoint that can receive incoming connection requests.

socket.listen changes a bound TCP socket into a listening endpoint for incoming connection requests. The server then calls accept to obtain a separate connection socket for communicating with each client. section 3.1

Listening for a client

A blocking server creates an IPv4 TCP socket, binds it to 127.0.0.1:8000, calls listen(), and waits at accept() for a client connection. section 3.1

How Python Concurrency with asyncio covers it

How deep it goes
Demonstrates listen in a runnable blocking-socket sequence, placing it after bind and before accept.
Examples
Uses a localhost port, a server socket, and a client connection handled through a separate socket.
What you can do after
Operate/configure a TCP server socket by binding it, listening, and accepting a client connection.
How it connects
Connects server sockets with bind, accept, TCP, and client connections.
Cover of Python Concurrency with asyncio
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