Simple script to rename files based on their MD5

rename.py

#!/usr/bin/env python3

import sys
import argparse
import os
import hashlib

def parseArguments():
    parser = argparse.ArgumentParser(description="Rename files based on their MD5")
    parser.add_argument('file',
                        type=argparse.FileType('rb'),
                        nargs='+')
    parser.add_argument('-x', '--extension',
                        default='file',
                        help='Extension to rename input files to (default is ".file")')
    
    args = parser.parse_args()
    
    return args


def main():
    args = parseArguments()

    for f in args.file:
        filemd5 = hashlib.md5(f.read()).hexdigest()
        newFilename = "{:s}.{:s}".format(filemd5, args.extension)
        print("Renaming file {:s} to {:s}".format
              (f.name, newFilename),file=sys.stderr)
        os.rename(f.name, newFilename)

if __name__ == "__main__":
    main()