Rename URL encoded file name

decodeurl.py

#!/usr/bin/env python3

import urllib.parse as parse
import os

def print_usage():
    print('Usage: decodeurl.py encodedfilename')

def main(fname):
    if not os.path.isabs(fname):
        fname = os.path.abspath(fname)
    directory, fname = os.path.split(fname) 
    if not os.path.lexists(directory + '/' + fname):
        print('File does not exist')
        exit()
    decoded = parse.unquote(fname)
    print(directory + '/' + fname)
    print('will be renamed to')
    print(directory + '/' + decoded)
    k = input('Okay? [Y/n]')
    if k == '' or k == 'y' or k == 'Y':
        os.rename(directory + '/' + fname,
                  directory + '/' + decoded)

if __name__ == '__main__':
    import sys
    if len(sys.argv) < 2:
       print_usage()
       exit()
    main(sys.argv[1])