How to get create your real-work simple server on Python

I am writing simple app with using Python socket lib. I wrote a simple Server and Client. On my local computer is works. But I want to send Client app to my friend. The problem is here:

Server:
HOST = "127.0.0.1"
port = 3010
serverSocket.bind((HOST, port))

Client:
HOST = "127.0.0.1"
port = 3010
clientSocket.connect((HOST, port))

When this apps run on my local machine it is ok. But what HOST should be to make possible communicate with MY computer from other computer?