title: Using math.floor to round down to a specific decimal point
body: <p>Given the string <code>a="1.351"</code>, how do I round down to 2 decimal points? I tried:</p>
  
  <pre><code>a = "1.351"
  b = "%0.2f" % float(a)
  c = math.floor(float(b))  
  print c  # gives me an output of 1.0
  </code></pre>
  
  <p>Ideally I would like an output of <code>1.30</code>.</p>