Script to change the extension of multiple files in a directory with Python. [pt-br: Script para mudar a extenção de multiplos arquivos usando Python]

change_extension.py

#!/usr/bin/python
# coding: utf-8
 
import os
 
OLD_EXT = '.rar' # Change here for the old extension
NEW_EXT = '.cbr' # Change here for the new extension
CURRENT_DIR = os.getcwd()

def main():
    for f in os.listdir(CURRENT_DIR):
        old_file = os.path.join(CURRENT_DIR, f)
        filename, ext = os.path.splitext(f)
        if ext == OLD_EXT:
            new_file = old_file.replace(OLD_EXT, NEW_EXT)
            os.rename(old_file, new_file)
    print 'done!'

 
if __name__ == '__main__':
    main()