This will batch rename a group of files in a given directory, once you pass the current and new extensions

Author: geekcomputers

batch_file_rename.py

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+# Script Name		: batch_file_rename.py
+# Author				: Craig Richards
+# Created				: 6th August 2012
+# Last Modified		: 
+# Version				: 1.0
+
+# Modifications		: 
+
+# Description			: This will batch rename a group of files in a given directory, once you pass the current and new extensions
+
+import os															# Load the library module
+import sys															# Load the library module
+
+work_dir=sys.argv[1]											# Set the variable work_dir with the first argument passed
+old_ext=sys.argv[2]											# Set the variable work_dir with the first argument passed
+new_ext=sys.argv[3]											# Set the variable work_dir with the first argument passed
+
+files = os.listdir(work_dir)									# Set the variable files, by listing everything in the directory 
+for filename in files:											# Loop through the files
+  file_ext = os.path.splitext(filename)[1]				# Get the file extension
+  if old_ext == file_ext:										# Start of the logic to check the file extensions, if old_ext = file_ext
+    newfile = filename.replace(old_ext, new_ext)	# Set newfile to be the filename, replaced with the new extension
+    os.rename(													# Write the files
+	    os.path.join(work_dir, filename),
+		os.path.join(work_dir, newfile))