title: python change starting up/default directory
body: <p>I am new to python. 
  Every time I start the shell, it always gives me directory as:</p>
  
  <blockquote>
    <p>".../file name/Python/"</p>
  </blockquote>
  
  <p>But I want to change it to: </p>
  
  <blockquote>
    <p>".../file name/python program/" </p>
  </blockquote>
  
  <p>How do I do it without changing the import modulate stuff?
  I am afraid to make it wrong so that I can't import anymore, but it is so annoy to put:</p>
  
  <pre><code>import os
  os.chdir(".../file name/python program/")
  </code></pre>
  
  <p>every time after I open the shell.
  Thanks for help!</p>