If this kind of optimization is a bottle neck for you, then you shouln't be using Python anyway over something like C

I think shadowing a built-in generally refers to asigning a built-in to something else, e.g. print = lambda x:x+1

This kata demonstrates how difficult it is to sandbox python

Tests cases should test that the solution is a set {}, matching description not another iterable. This would also prevent issues of duplicates, e.g. this should fail https://www.codewars.com/kata/reviews/634af9129a16f90001e6b813/groups/634c769f675bc30001fc4729

Description asks for a set, this is a list

Nice Kata- approved in Python and set to 7ku

Give this Kata a more meaninfull name

Actually with a negative integer it returns and empty string '' not an error (it will return an error for float * string). It's not specificed what the desired output is for these cases

Requires random tests. Also, I guess this is a duplicate kata.

It is the duty of the Kata author(s) to enforce any rules in the test cases

Thanks!

As the Kata author, to reply to several comments. I suggested 6 kyu for this Kata based on the concept, but when it was approved the rating was set at 7 kyu by the approver. I cannot edit the rank. Follow-up with the approver or a moderator if you wish

What would you suggest? I recomended 6ku, which is also the Average Assessed Rank

Thanks anter69!