title: Rounding scientific notation in python
body: <p>I have a number like <code>2.32432432423e25</code> in python that is the result of a computation. </p>
  
  <p>I want to round this to 3 decimal points to get the output:</p>
  
  <pre><code>2.324e25
  </code></pre>
  
  <p>I have tried to use:</p>
  
  <pre><code>x = 2.32432432423e25 
  number_rounded = round(x, 3)
  </code></pre>
  
  <p>But when I print <code>number_rounded</code> it outputs a number with the same format as  <code>x</code>. </p>
  
  <p>How do I limit the display of <code>x</code> to just 4 significant digits?</p>