title: How to change python version (interactive mode) in macports?
body: <pre><code>[mac-120183:/opt/local/bin] name% sudo port select --set python python33
  Selecting 'python33' for 'python' succeeded. 'python33' is now active.
  [mac-120183:/opt/local/bin] name% python
  Python 2.7.1 (r271:86832, Jul 31 2011, 19:30:53) 
  [GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; 
  [mac-120183:/opt/local/bin] name% which python
  /usr/bin/python
  [mac-120183:/opt/local/bin] name% which python3.3
  /opt/local/bin/python3.3
  </code></pre>
  
  <p>How may I switch my python to python3.3 when I type python to use interactive mode in command line?</p>
  
  <p>Thanks</p>