Totally agree!

by current standards, immortal would come out of beta at most at 3 kyu. Which says a lot about the current standards...

(1) and (3) are overrated, and (1) should not have been translated to Python ( or at least certain imports should have been forbidden ).

I don't have an opinion on (0) or (2) because I've never been able to solve them.

Is it unreasonable to rank a kata on its simplest possible solution

I think so, yes. There are solutions to Become Immortal which make the kata look like it could have been 6kyu. There are many other kata whose solutions can be much simpler than their rank might imply.

Having said that, even the naive approach to this kata should be able to solve it with just a a few loops and simple variables. No advanced algorithms are needed, there's no hidden information. There are tools that make it easier if you know about them, but even without them I think this should be a 6kyu at best, and I think 7kyu is fine.

impressive

wow

But what if n=0?

Doesn't this code do excess work?

I see, thanks. I'll try someday :-)