OSError: [Errno 24] Too many open files

[GianvitoMarzo]

cryptography-03lpyov-exercises/AY2122/Python/attacks/CBCPaddingOracle/CBCPaddingOracle_client.py

Line 70 in 973a5a7

server = remote(HOST, PORT)

Running this code on a linux virtual machine and on wsl, I get an error on the remote command on line 70:
on virtual machine -> OSError: [Errno 24] Too many open files
on wsl -> OSError: [Errno 16] Device or resource busy

That's because connections with the server are never closed.

Adding server.close() on line 74 fixes this problem