title: align float and specify precision in string formatting
body: <p>I have this working test code:</p>
  
  <pre><code>In [16]: print "{:&gt;20}{:0.2f}".format("", 34)
                  34.00
  </code></pre>
  
  <p>but I would like to do it with just one argument in format, how do I write that?</p>