title: For Loop, os.listdir() not working correctly
body: <p>I am creating a script to create new folder hierarchies for a friend of mine.  There are around a thousand clients, so a script would save a ton of time.  I have everything almost working, the part I don't have is this.</p>
  
  <pre><code>yearList = os.listdir(driveLetter + clientName)
  for year in yearList:
      os.chdir(year)
      os.mkdir('Folder One')
      os.mkdir('Folder Two')
      os.mkdir('Folder Three')
  </code></pre>
  
  <p>Under this, are creations for sub folders, like so:</p>
  
  <pre><code># Create folders under 'Folder One'
      os.chdir(driveLetter + clientName + '\\' + year + '\Folder One')
      os.mkdir('Sub Folder One')
      os.mkdir('Sub Folder Two')
  </code></pre>
  
  <p>2005 is the first element in the list of yearList.  This runs fine for 2005, but I get this error:</p>
  
  <pre><code>WindowsError: [Error 2] The system cannot find the file specified: '2006'
  </code></pre>
  
  <p>This would really help my friend out, so I am pretty motivated to do it (And pretty[read: very] new to programming)</p>
  
  <p>Thanks for any assistance that can be provided</p>