title: Change python version from 3 to 2.7
body: <p>now my default python version is 3.5 </p>
  
  <pre><code>python -V
  Python 3.5.1
  </code></pre>
  
  <p>How i can reset my default Python version to 2.7? </p>
  
  <p>My os - Mac osx 10.11.4 (15E65)</p>
  
  <p>which python</p>
  
  <pre><code>/usr/bin/python
  </code></pre>
  
  <p>echo $PATH</p>
  
  <pre><code>/usr/local/mysql/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
  </code></pre>