For python 3........

Write code to determine what unique words (no duplicates) are used in the text below. Your code should work no matter what string of words is stored in text: text = "the first thing to know is that the cat is the best animal ever a cat will make you happy when you are sad when a cat purrs you know the cat likes you cats are the most intelligent and curious pets the best thing about cats is that they have very soft fur and are very cute