title: Python - WindowsError: [Error 2] The system cannot find the file specified
body: <p>I have a folder full of pdf files. I'm trying to remove all the spaces from files name and replace them with underscores. Here's what I have so far:</p>
  
  <pre><code>import os, sys
  
  folder = path to folder
  FileList = os.listdir(folder)
  
  for files in FileList:
      if ' ' in files:
          NewName = files.replace(" ", "_")
          os.rename(files, NewName)
  </code></pre>
  
  <p>When I run this script I get the following error:</p>
  
  <pre><code>WindowsError: [Error 2] The system cannot find the file specified
  </code></pre>
  
  <p>I'm guessing there is a pretty simple fix, but I've look all over and cannot find a solution for the life of me.</p>
  
  <p>Thanks for the help!</p>