title: modulus of negative numbers in Python
body: <pre><code>23 % -5 = -2
  23 % 5 = 3
  </code></pre>
  
  <p>Can someone explain to me how I can understand this because I have an exam tomorrow. I want to say its because <code>-5 * -5 =25</code> then <code>25 -2 = 23</code> which is how they get the <code>23</code>. Is this correct?</p>