title: Setting the fmt option in numpy.savetxt
body: <p>I am looking at the <code>numpy.savetxt</code>, and am stuck at the <code>fmt</code> option. </p>
  
  <p>I tried looking at <a href="http://docs.python.org/2/library/stdtypes.html#string-formatting" rel="noreferrer">here</a> and also the reference in the link below all the letters that can be used for the <code>fmt</code> option sort give me a general sense of what is going on. </p>
  
  <p>What I do not understand is if the <code>%</code> symbol is required and in an example given <a href="http://library.isr.ist.utl.pt/docs/numpy/reference/generated/numpy.savetxt.html#id2" rel="noreferrer">here</a> how should I interpret the 10.5 number? 
  If "f" is about setting the floating point, then how come is it 10.5 (then again, I might not know how floating points are set...).</p>