title: Python ConfigParser interpolation from foreign section
body: <p>With Python ConfigParser, is it possible to use interpolation across foreign sections?  My mind seems to tell me I've seen that it's possible somewhere, but I can't find it when searching.</p>
  
  <p>This example doesn't work, but it's to give an idea of what I'm trying to do.</p>
  
  <pre><code>[section1]
  root = /usr
  
  [section2]
  root = /usr/local
  
  [section3]
  dir1 = $(section1:root)/bin
  dir2 = $(section2:root)/bin
  </code></pre>
  
  <p>Note that I'm using Python 2.4.</p>