title: After installing VISA and PyVisa, VISA module is not found
body: <p>I'm on <a href="http://en.wikipedia.org/wiki/OS_X_Mountain_Lion" rel="nofollow">Mac&nbsp;OS&nbsp;X&nbsp;v10.8.5</a> (Mountain Lion). I've installed NI-VISA 5.4 and PyVisa 1.5. When I try 'import visa', I get this traceback:</p>
  
  <pre><code>Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named visa
  </code></pre>
  
  <p>Printing the sys.path shows this in the listing:</p>
  
  <pre><code>/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyVISA-1.5.dev0.dev-py2.7.egg
  </code></pre>
  
  <p>I have also tried this:</p>
  
  <pre><code>import pyvisa
  from pyvisa.vpp43 import visa_library
  visa_library.load_library("/Library/Frameworks/VISA.framework/VISA")
  import visa
  </code></pre>
  
  <p>But I get the same error.</p>
  
  <p>Why can't the module be found? What am I missing?</p>
  
  <p>UPDATE: I realized that PyVisa 1.5 was a development build, so I installed PyVisa 1.4 instead (I tried both <a href="http://en.wikipedia.org/wiki/MacPorts" rel="nofollow">MacPorts</a> and just downloading the tarball and installing it manually). I'm still getting the same error.</p>