Having Problems with Arguments
<p>I have tried to write this little script that will batch rename file extensions. I am passing three arguments, the directory where the files are located, the current extension, and the new extension.</p>

<p>The error I am getting is</p>

<pre><code>python batch_file_rename_2.py c:\craig .txt .html
Traceback (most recent call last):
  File "batch_file_rename_2.py", line 13, in &lt;module&gt;
  os.rename(filename, newfile) 
WindowsError: [Error 2] The system cannot find the file specified
</code></pre>

<p>The code is</p>

<pre><code>import os
import sys

work_dir=sys.argv[1]
old_ext=sys.argv[2]
new_ext=sys.argv[3]

files = os.listdir(work_dir)
for filename in files:
    file_ext = os.path.splitext(filename)[1]
    if old_ext == file_ext:
        newfile = filename.replace(old_ext, new_ext)
        os.rename(filename, newfile)
</code></pre>
