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    <p>Right now, you're drawing a different category three times. The first time you compare it to <code>'animals'</code>; the second to <code>'colors'</code>; and the third to <code>'adjectives'</code>. </p> <p>But what if you drew <code>'colors'</code> and then <code>'animals'</code> and then <code>'colors'</code> again? None of your three "if" branches will trigger. Since there's no <code>return</code> which is executed, there's an effective <code>return None</code> at the end.</p> <p>Alternatively, if your <code>names</code> isn't what you think it is, you could be drawing a <code>None</code> value, I guess: you didn't show the whole stacktrace, so I'm guessing about where the error manifests.</p> <p>(Also, your <code>wordIndex</code> could possibly be set to <code>len(wordList)</code>, which would result in an IndexError because the last index is <code>len(wordList)-1</code>. Moreover, since the <code>wordIndex</code> didn't necessarily come from the list associated with the category, you could have indexing errors there too.)</p> <p>I think you can simplify your code to something like:</p> <pre><code>import random animals = 'ape bear beaver cat donkey fox goat llama monkey python bunny tiger wolf'.split() colors = 'yellow red blue green orange purple pink brown black white gold'.split() adjectives = 'happy sad lonely cold hot ugly pretty thin fat big small tall short'.split() names = {'animals': animals, 'colors': colors, 'adjectives': adjectives} def getRandomWord(words_by_category): category = random.choice(list(words_by_category.keys())) print("the category is", category) wordlist = words_by_category[category] chosen_word = random.choice(wordlist) return chosen_word </code></pre> <p>after which we have:</p> <pre><code>&gt;&gt;&gt; getRandomWord(names) the category is colors 'blue' &gt;&gt;&gt; getRandomWord(names) the category is adjectives 'happy' &gt;&gt;&gt; getRandomWord(names) the category is colors 'green' &gt;&gt;&gt; getRandomWord(names) the category is animals 'donkey' </code></pre>
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