code: def _get_last_cachefile_modification(self):
          
  
          try:
              mtime = os.path.getmtime(self._tld_list_path)
          except OSError:
              return None
  
          return datetime.fromtimestamp(mtime)
docs: Get last modification of cache file with TLDs.
  
          :return: Date and time of last modification or
                   None when file does not exist
          :rtype: datetime|None