code: def _valid_locales(locales, normalize):
      
      if normalize:
          normalizer = lambda x: locale.normalize(x.strip())
      else:
          normalizer = lambda x: x.strip()
  
      return list(filter(can_set_locale, map(normalizer, locales)))
docs: Return a list of normalized locales that do not throw an ``Exception``
      when set.
  
      Parameters
      ----------
      locales : str
          A string where each locale is separated by a newline.
      normalize : bool
          Whether to call ``locale.normalize`` on each locale.
  
      Returns
      -------
      valid_locales : list
          A list of valid locales.