test cases might help to understand the question.

Funny kata to practicing sort. Thanks.

Genius ! Algrithme is the king.

inspired.

A few more line might improve performance a lot for some cases, but may destroy the beauty of your wonderful codes, and look ugly definately.

From engieering point of view, I would believe a few more lines is better.

It is a little difficult to understand, my ugly version might be a little easier for most of us(not every one is number master)

Clever !
I have simillar idea, but you code is super tidy and clean !

Hi, good Kata. please put x =0 or y=0 in the test casees. IsDiv(n, x,y).

best solutions voted has a bug if x=0 or y =0.

It is a clever solution and fast, you know numbers well !

However, for beginners, list related method need to be trianed as well, even though performance is poor.

Surprinsingly, it is fast !!!

For better performance. a few more line code.

More Lines, but efficient !

please put the test case into base test. some of the best solution have bugs.
Test.assert_equals(cat_mouse('C.D....m..................', 6), "Protected!")

This kata is quite difficult, and should be marked as 4kyu or 3 kyu.

It seams that test case like "1.2.3.04" or "1.2.3.00", "123.89.09.1" is missing. the best solutions with re, have bugs.
Would suggest to add test case:
Test.assert_equals(is_valid_IP('12.255.56.01'), False)

nice kata! I would suggest a comment for the example, to make the descriptio easier to understand :

s = "aqdf& 0 1 xyz 153 777.777" must return "0 1 153 154 Lucky" where 154 = (0 + 1 + 153)

It taken me hours to understand why threre is a 154.