Thanks man, glad you found my explanations useful!

I like the use of numpy in your solution btw.

second case: did you see the comments below? I explain it in the answer to SuryaGrandhi

if not enough, search about tuples/list comparisons

I need only one clarification that how is tuple values which is (0 or 1, n or -n) helps in sorting ascending and descending as if n is even or odd.

What was the input value there? The error message shows the value your function returns and the expected value.