Creating a word list

[opencircles]

I would like to take any text document and make a word list from the file with no duplicates. I don't know much about programming. This is the best I have been able to come up with. Thanks!

 	
def MakeWordList():
    with open('test.txt','r') as f:
        data = f.read()
    return set([word for word in data.split()])

    print ()