You can, but, IME, the practical benefit of doing so generally isn't proportional to the cost. It's just something you do if you have strong feelings about type

You can, but, IME, the practical benefit of doing so generally isn't proportional to the cost. It's just something you do if you have strong feelings about type discipline and are willing to sink a bunch of time into soothing them. It may have to do with the types you're using. When I'm doing EDA, I'm usually zooming past the arrays and dicts as quickly as I can, and making a beeline for something like Pandas that lets me manipulate the data more easily. Pandas is fairly pretty resistant to static typing, and getting over to something that does play nicer with static typing tends to also necessitate a lot of wheel reinvention. Tends to also bring a performance cost, too, since I'm often losing a lot of nice fast multithreaded C++ implementation for a mess of pointer chasing and GIL.