Typo in the first example - Python description

cell (x = 8, x = 8) => cell (>>> y <<< = 8, x = 8)

Quite generic implementation - you have also a converter from tabular to gregorian calendar for free.

Kudos for the clean solution!

You can avoid a copy with a simple syntax making it quite similar to using a unique pointer in C (cf this kumite not to spoil others in comments)

Not really the same issue.
For yours, you just have to consider it goes back to 6.
Even negative indexes could be defined that way.

No floating point division involved - only integer division

You might expect a player attempting a 4kyu kata knows these builtins and bump your requirements consequently.
Looping fast is not that helpful if the expected algorithm doesn't have the same order of magnitude.

-Bump for previous message-

Planning to release this kata for Python?

One pass only

Here you can talk about functional programming, which finds its roots in lambda calculus.
But here stops the comparison, because there isn't something close to a computational model here.

Lambda calculus and Turing machine are equivalent computational models because they can solve the same class of problems.

I have the feeling that the comparison you want to bring here is more about functional programming vs. imperative programming.

Adding comments may help as in your solution, kudos for that.
However using a bunch of ifs that only vary by a word/letter is not very pythonic as well.
Meaningful variable names is often much better than a long comment.
If you remove the comments in your solution, it is not much different than this solution, just longer.

Passing float instead of integer to a function raises more likely TypeError instead of ValueError.

(see for example https://github.com/python/cpython/commit/f066bd94b9225a5a3c4ade5fc3ff81e3c49b7b32)

May be more interesting to switch to TypeError instead.