linux python sockets not really closing stack overflow

**understanding the socket lifecycle (simplified tcp version)**

before we start with code, it's crucial to understand the stages a tcp socket goes through. this affects how you close it properly.

2. **binding (server-side):** servers *bind* the socket to a specific ip address and port. this assigns it an identity on the network.
3. **listening (server-side):** the server transitions the socket into *listening* mode, meaning it's ready to accept incoming connections.
4. **connection establishment (client-side / server-side):**
* **client:** the client *connects* to the server's ip address and port.
* **server:** the server *accepts* the client's connection. this `accept()` call returns a *new* socket object dedicated to communicating with that specific client. the original listening socket remains open to accept more connections.
5. **data transfer:** data is sent and received through the socket using `send()` and `recv()`.
6. **connection termination:** this is where it gets tricky. both the client and server need to agree to close the connection. this involves the following:

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