Sort of interesting how Python has got rid of the GIL. Serialization of data securities is still something relevant though and I’m not sure if you should use pickle still?
Pickle is insecure by design, but definitely convenient if you can trust the input.
If you need something safe then you really need to identify your requirements and your threat model first anyway; I wouldn't blindly reach for a one-size-fits-all solution in any programming language.
(Although I would do a quick check to see JSON or TOML is sufficient and practical.)
Pickle is likely still handy, as long as you created the data that you're deserializing. Zope's object database was a big pickle file, as I recall. But yeah, not a good idea if you're cracking open user-supplied files in any way.
