This post by @kobzol highlights some good methodologies for writing Python in a more defensive manner.
I learned that typing.assert_never allows one to inform their IDE/type checker about code which should be unreachable.
Similarly, simpler Union typing and the existence of the pyserde package make for more powerful access to data - but I’ll have to test serde against the venerable pydantic which has been my go-to for the longest time.
A good read for sure!