Python, number, unique

class NPArrayLike:
    def __init__(self, list):
        self._list = list 

    def __getitem__(self, indices):
        return [self._list[idx] for idx in indices];

if __name__ == "__main__":
    out = NPArrayLike([1,2,3,4,6])
    indices = [0,1,4,3,1,2,1]
    print(out[indices]) # [1, 2, 6, 4, 2, 3, 2]