How to return unique words from the text file using Python

Question

How do I return all the unique words from a text file using Python? For example:

I am not a robot

I am a human

Should return:

Answer 1

This seems to be a typical application for a collection:

...
import collections
d = collections.OrderedDict()
for word in wordlist: d[word] = None 
# use this if you also want to count the words:
# for word in wordlist: d[word] = d.get(word, 0) + 1 
for k in d.keys(): print k

You could also use a collection.Counter(), which would also count the elements you feed in. The order of the words would get lost though. I added a line for counting and keeping the order.