[Python] command line websocket client for Raspberry Pi2- no browser required implementation?

Send data read from GPiO to server, not only with WIFI, but also on mobile network outside anywhere. I dont have and dont want to deal with setting a public address for RPi2, so this is why I need RPi2 to be client, sending data thru websockets to server on public address. It could be node.js, python, PHP client - server, as long as it is without of the need for a browser at the client side RPi2. Any suggestions ? Thank you.

Additionally, can you please explain how would "server side node.js client" work ?

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