Batch Rename as Parent Directory

quick_rename.py

import os


def main():
    '''Stupidly simple script to rename all files to the name of their
       parent_dir directory.

       Warning: Be careful when running, this could be bad... Also
       make sure your current directory doesn't have anything in
       it but folders. Otherwise they'll get renamed to ..extention
    '''
    for dir_name, subdirs, files in os.walk('.'):
        parent_dir = dir_name.rsplit('/', 1)[-1]
        for fname in files:
            new_name = "{}.{}".format(parent_dir, fname.split('.', 1)[-1])
            os.rename("{}/{}".format(dir_name, fname),
                      "{}/{}".format(dir_name, new_name))

if __name__ == "__main__":
    main()