title: How can I make the default value of an argument depend on another argument (in Python)?
body: <p>For instance, I want:</p>
  
  <pre><code>def func(n=5.0,delta=n/10):
  </code></pre>
  
  <p>If the user has specified a delta, use it. If not, use a value that depends on n. Is this possible?</p>