Thank you so much! it make sence now...i got it!

If both have 0 length it should return true. Both arrays are the 'same' - that is to say they have no elements.

I also tried this situation...not useful~

if(a.length == 0 || a == null || b.length == 0 || b == null){
return false;
}

it also says "expected:<false> but was:<true>"

maybe they're null?

I think i have same problem with you..have you passed later? what did you do?

Sorry, I misunderstood.
This translation is rather old and I am not the Python translator.
Moreover - as you might know - when more than 500 warriors have passed a kata in a given language it is not authorized to change the tests. Some months ago I added some tests in a few other languages, in Python it was impossible.
Anyway thanks for your posts.

[JAVA]
I can pass all cases except case 4, which length of int[] a and int[] b both 0. i've already checked for this situation at the first time as the code:

if(a.length == 0 || b.length == 0){
return false;
}

but it didn't work!!
isn't it right? did i miss something?