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

Simply iterate over the lines in the file and use set to keep only the unique ones.

from itertools import chain

def unique_words(lines):
    return set(chain(*(line.split() for line in lines if line)))

Then simply do the following to read all unique lines from a file and print them

with open(filename, 'r') as f:
    print(unique_words(f))