lambda x: x % 2</code></pre>

        <blockquote>
          <p>Bad</p>
        </blockquote>

        <pre><code>a, b, m = 100, 0, 0
thing = &#x27;hello world&#x27;
stuff = lambda x: x % 2</code></pre>


        <h3 id="indices-and-mathematical-symbols">Indices and mathematical symbols</h3>


        <p>Using one-letter names and abbreviations is okay for indices, mathematical
          symbols, or if it is obvious what the variables are referring to.</p>

        <blockquote>
          <p>Good</p>
       