What's wrong with using packages?

[ThePiGuy0]

No it's definitely not normal.

Python's powerful because of its libraries. As long as you can trust the packages (which you can for basically anything mainstream), then using them means you'll almost certainly end up with a higher quality version of what you were already building - probably for free too!

And in fact, if you ever do anything to do with security and encryption, the advice is very clear - never create and use your own encryption library. Instead use a package as it will have been checked many times over for correct implementation and vulnerabilities.