in Python, [] is empty, and would evaluate as a Boolean False, but it is not equal to None.

I've logged the params. It printed as above. And gave error

Then I remembered that in python [] is equal to None...
And compared them and it worked flowless

Python
I fail this one test...
a1 = [2, 2, 3]
a2 = [4, 9, 9]
test.assert_equals(comp(a1, a2), False)

Because don't think about count of elements, and use the set in my solutions((

a1 = []
a2 = None
test.assert_equals(comp(a1, a2), False) 

That test expects False, your code is failing another test.