Python

TIL Python hash() function is not stable between Python runs, but not even in the multiprocessing.

Python hash() is non-deterministic to avoid dictionary stuffing attacks in web servers https://thepythoncorner.com/posts/2020-08-21-hash-tables-understanding-dictionaries/

However Python hash function seems to be also unstable in multiprocessing: in certain scenarios subprocesses generate different hashes.

For persistent hashes (cache) and communications use hashlib.md5() or hashlib.sha()

Great tip! For consistent hash values, hashlib is definitely the way to go. It's crucial for data integrity across different environments.