normalisename/normalisename.py

from sys import argv
from os import rename
from unidecode import unidecode


# whitespaces will be replaced
# dots are ok
# do not ruin previous work
# dashes are ok
whitelist = [' ', '.', '_', '-']

for file in argv[1:]:
    rename(file,
           unidecode
           (
               ''.join(ch for ch in file
                       if ch.isalnum()
                       or ch in whitelist)
           )
           .replace(' ', '_'))