How to close a socket connection in python?

Question

I have socket server and socket client two side programs:

The server:

#!/usr/bin/env python3 #-*- coding:utf-8 -*- # Author:sele import socket HOST = '127.0.0.1' PORT = 65432 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) if addr and addr[0] != '127.0.0.44': conn.sendall(b'ip error') # there I want to cut off the socket connection. else: while True: data = conn.recv(1024) if not data: break conn.sendall(data)

the client:

#!/usr/bin/env python3 #-*- coding:utf-8 -*- # Author:lele import socket HOST = '127.0.0.1' PORT = 65432 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))

you see, in my server code: if addr and addr[0] != '127.0.0.44': there I want to close the connection, how to do with it?

whether just add the conn.close() code in that place?

because I tried use conn.close(), then the server seems stop running now:

sele-MacBook-Pro:test01 ldl$ ./tests02-server.py Connected by ('127.0.0.1', 53321) sele-MacBook-Pro:test01 ldl$

Jeremy Friesner · Accepted Answer · 2019-04-13 04:36:44Z

Calling conn.close() is indeed the correct way to close the connection.

because I tried use conn.close(), then the server seems stop running now:

Right, because that's what you programmed the server to do. In particular, the client closing the connection causes conn.recv(1024) to return None, which causes your if-test to succeed and then break breaks the server out of its while-loop, and from there the server exits, because there are no further loops for it to execute.

 while True: data = conn.recv(1024) if not data: break

If you want the server to keep running (and accept another socket connection) afterwards, you need to put another while True: loop around the code that starts at the s.accept() line, i.e.:

while True: conn, addr = s.accept() with conn: print('Connected by', addr) [...]

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