Python Socket Port Use

Question

I'm trying to set a server application and client application in which the server will listen for connections using localhost and a certain port - however - if for example, the port is 2001 - if that port is not available, I would like to use 2002, if that's not available then 2003 - etc. How do I implement that in my code?

example = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
example.bind(("localhost",2001))

you can use example.bind(address, port) inside a try -except.... — Kobi K
– Kobi K, Commented Dec 11, 2013 at 12:26

Aswin Murugesh · Accepted Answer · 2013-12-11 12:26:26Z

2

may be just loop around till it doesnt generate an exception

port = 2001
while True:
    try:
        example.bind(("localhost",port))
    except:
        port += 1
        continue
    break

answered Dec 11, 2013 at 12:26

Aswin Murugesh

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James Mills · Accepted Answer · 2013-12-11 12:27:00Z

0

Rather than try to find an available free port in some kind of loop you can bind to port 0 (zero) and let your OS bind to a suitable free port. You can then access the bound port via introspecting the server socket object using socket.getsockname()

answered Dec 11, 2013 at 12:27

James Mills

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Girish · Accepted Answer · 2013-12-11 12:30:52Z

0

I prefer to bind the socket to a random port number assigned by the kernel and then query for the port number opened.

example.bind((host,0)) #0-random, free port number
example.getsockname()

answered Dec 11, 2013 at 12:30

Girish

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