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

for word in word_list:
    if word not in word_list:

every word is in word_list, by definition from the first line.

Instead of that logic, use a set:

unique_words = set(word_list)
for word in unique_words:
    file.write(str(word) + "\n")

sets only hold unique members, which is exactly what you're trying to achieve.

Note that order won't be preserved, but you didn't specify if that's a requirement.