The electricity goes off for client during the connection, what happen to server ? Try/except/finally

What ways to protect against SQL injection do you know? Hash functions ? MD5/sha256 and others - what's the best to use and why? example of SQL injection

What protocol do you use for communication between server-client? What's the purpose of the second parameter in socket() function

When do you use RSA , when AES?

In tools.py you have a chunk_size defined as 190. Why?

 What's the difference between process and thread?

Pickle and json - why to use them?

TCP vs UDP