get open TCP port in Python

I want to get any random open TCP port on localhost in Python. What is the easiest way?

My current solution:

def get_open_port():
        import socket
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.bind(("",0))
        s.listen(1)
        port = s.getsockname()[1]
        s.close()
        return port

Not very nice and also not 100% correct but it works for now.