title: I cannot import igraph on python 2.6 after installation
body: <p>I installed igraph for python 2.6 on OSX 10.7, but I cannot import igraph library. </p>
  
  <p>It shows a import error:no module name igraph. </p>
  
  <p>I have no idea. Please help me out.</p>
  
  <p>Thanks.</p>