title: Python: os.path.isfile won't recognise files beginning with a number
body: <p>So, I'm trying to incorporate <code>os.path.isfile</code> or <code>os.path.exists</code> into my code with success in finding certain regular files(pdf,png) when searching for filenames that begin with a letter.</p>
  
  <p>The file naming standard that I'm using (and can't change due to the user) starts with a number and subsequently can't be found using the same method.  Is there a way that I can make these files discoverable by <code>.isfile</code> or <code>.exists</code>?</p>
  
  <p>The files I'm searching for are .txt files.</p>
  
  <pre><code>    os.path.isfile("D:\Users\spx9gs\Project Work\Data\21022013AA.txt")
  
      os.path.isfile("D:\Users\spx9gs\Project Work\Data\AA21022013.txt")
  </code></pre>
  
  <p>Returns:</p>
  
  <p>False</p>
  
  <p>True</p>