title: Python - abs vs fabs
body: <p>I noticed that in python there are two similar looking methods for finding the absolute value of a number:</p>
  
  <p>First</p>
  
  <pre><code>abs(-5)
  </code></pre>
  
  <p>Second</p>
  
  <pre><code>import math
  math.fabs(-5)
  </code></pre>
  
  <p>How do these methods differ?</p>