Okay I somehow made it pass by adding return [0, 1] as an outer condition. Not sure why my code all of a sudden works now...

What is returning from your two_sum function? The sorted function isn't recognizing de result of two_sum as a iterable object.

I'm getting
Traceback (most recent call last):
File "main.py", line 5, in
Test.assert_equals(sorted(two_sum([2,2,3], 4)), [0,1])
TypeError: 'NoneType' object is not iterable

How is it a NoneType object? It looks like it's an array.

Because that would be too easy I guess? Apparently children know how to determine perfect powers.....

Hahahaha. People did this in one simple line.

I wrote 17 lines and took like an hour to figure out how to do it.