In your situation, the reason for the above mentioned error (ConnectionRefusedError: [Errno 111] Connection refused) is because the second snippet of code's function is to connect to a server that is listening for incoming connections, but you did not execute the first snippet of code so there was no server for the client to connect to when the second snippet of code was executed.

You can resolve the error by first executing the first snippet of code, creating a server that listens on port 8080. Next execute the second snippet of code, establishing a connection to the server and sending the data ("Hello, world!").

I hope this solved your problem!
Feel free to ask me for assistance upon encountering another error.
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