Improve whitespace elimination with re.sub()

normalisename.py

@@ -3,6 +3,7 @@ from unidecode import unidecode
 from os import rename
 from os.path import basename, dirname
 from os.path import join as joinpath
+from re import sub as substitute
 from argparse import ArgumentParser
 from sys import exit
 
@@ -45,7 +46,7 @@ class normalisename:
         return file == self.normalname(file)
 
     def normalname(self, filename):
-        return unidecode(''.join(ch for ch in filename.replace(' ', self.separator)
+        return unidecode(''.join(ch for ch in substitute('\s+', self.separator, filename)
                                  if ch.isalnum()
                                  or ch in self.whitelist))