title: How to code python function that adds n spaces between characters in a str?
body: <p>There shouldn't be a space before the first char or after the last one.</p>
  
  <p>I need a function</p>
  
  <pre><code>def spaces2str(n,s)
  </code></pre>
  
  <p>Where, if n=3, s='foobar'
  it should return 'f   o   o   b   a   r':</p>
  
  <pre><code>&gt;spaces2str(3,'foobar')
  'f   o   o   b   a   r'
  </code></pre>