title: How can I make my Python script a system command and run it easily in any directory in Windows?
body: <p>I am a Python rookie and I learn Python3.3 in Windows.</p>
  
  <p>I wrote my first script, a script to rename files with incremental filenames. But by now, I had to copy my <code>rename.py</code> script to the directory I want to change the files names and run <code>Python rename.py</code>. It is not a very fancy way to use.</p>
  
  <p>I can improve my code and pass the target directory to run my script in origin directory like <code>Python rename.py .../TargetDir</code>, but I have to copy the directory everytime.</p>
  
  <p>So I want to make my script a system command, then I would only type <code>rename</code> in cmd.exe in the directory I want to rename a bunch of files. How can I approach this.</p>