title: Formatting a tuple of floats
body: <p>How can I format a tuple of float to <code>.3f</code>?</p>
  
  <pre><code>In [1]: pi=3.14159265359
  
  In [2]: print "{:.3f}".format(pi)
  3.142
  
  In [3]: e=2.71828182
  
  In [4]: z=(pi,e)
  
  In [5]: print z
  (3.14159265359, 2.71828182)
  </code></pre>