Use sets to store uniqiue values.

Signatures:

None

Examples:

import random

all_words = "all the words in the world".split()

def get_random_word():
    return random.choice(all_words)

def get_unique_words():
    words = set()
    for _ in range(1000):
        words.add(get_random_word())

    return words

print(get_unique_words())   # output: {'world', 'all', 'the', 'words'}

References:

1. Python Interview Tips - Store Unique Values With Sets