title: pip install fails - ERROR: IPython requires Python version 2.7 or 3.3 or above
body: <p>I installed pip today on centos 6.4 and I've tried installing python libraries via pip.</p>
  
  <p>But, I got the following error.</p>
  
  <pre><code>ERROR: IPython requires Python version 2.7 or 3.3 or above.
  Complete output from command python setup.py egg_info:
  ERROR: IPython requires Python version 2.7 or 3.3 or above.
  
  ----------------------------------------
  Cleaning up...
  Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_username/ipython
  Storing debug log for failure in /home/username/.pip/pip.log
  </code></pre>
  
  <p>Although the error message says I need Python version 2.7 or above, I have installed python 2.7 already.</p>
  
  <pre><code>$ which python
  /usr/local/bin/python
  $ python --version
  Python 2.7.8
  </code></pre>
  
  <p>I'm not sure if it's causing this problem that I have python2.6 in "usr/bin/python".</p>
  
  <pre><code>$ sudo python --version
  Python 2.6.6
  </code></pre>