old_contents: # -*- coding: utf-8 -*-
  
  from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  
  import re
  import os
  import sys
  import pkgutil
  
  MULTIPLE_WHITESPACE_PATTERN = re.compile(r"\s+", re.UNICODE)
  
  
  def normalize_whitespace(text):
      """
      Translates multiple whitespace into single space character.
      If there is at least one new line character chunk is replaced
      by single LF (Unix new line) character.
      """
      return MULTIPLE_WHITESPACE_PATTERN.sub(_replace_whitespace, text)
  
  
  def _replace_whitespace(match):
      text = match.group()
  
      if "\n" in text or "\r" in text:
          return "\n"
      return " "
  
  
  def is_blank(string):
      """
      Returns `True` if string contains only white-space characters
      or is empty. Otherwise `False` is returned.
      """
      return not string or string.isspace()
  
  
  def get_stoplists():
      """Returns a collection of built-in stop-lists."""
      path_to_stoplists = os.path.dirname(sys.modules["justext"].__file__)
      path_to_stoplists = os.path.join(path_to_stoplists, "stoplists")
  
      stoplist_names = []
      for filename in os.listdir(path_to_stoplists):
          name, extension = os.path.splitext(filename)
          if extension == ".txt":
              stoplist_names.append(name)
  
      return frozenset(stoplist_names)
  
  
  def get_stoplist(language):
      """Returns an built-in stop-list for the language as a set of words."""
      file_path = os.path.join("stoplists", "%s.txt" % language)
      try:
          stopwords = pkgutil.get_data("justext", file_path)
      except IOError:
          raise ValueError(
              "Stoplist for language '%s' is missing. "
              "Please use function 'get_stoplists' for complete list of stoplists "
              "and feel free to contribute by your own stoplist." % language
          )
  
      return frozenset(w.decode("utf8").lower() for w in stopwords.splitlines())
  
new_contents: # -*- coding: utf-8 -*-
  
  from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  
  import re
  import os
  import sys
  import pkgutil
  
  MULTIPLE_WHITESPACE_PATTERN = re.compile(r"\s+", re.UNICODE)
  
  
  def normalize_whitespace(text):
      """
      Translates multiple whitespace into single space character.
      If there is at least one new line character chunk is replaced
      by single LF (Unix new line) character.
      """
      return MULTIPLE_WHITESPACE_PATTERN.sub(_replace_whitespace, text)
  
  
  def _replace_whitespace(match):
      """Normalize all spacing characters that aren't a newline to a space."""
      text = match.group()
      return "\n" if "\n" in text or "\r" in text else " "
  
  
  def is_blank(string):
      """
      Returns `True` if string contains only white-space characters
      or is empty. Otherwise `False` is returned.
      """
      return not string or string.isspace()
  
  
  def get_stoplists():
      """Returns a collection of built-in stop-lists."""
      path_to_stoplists = os.path.dirname(sys.modules["justext"].__file__)
      path_to_stoplists = os.path.join(path_to_stoplists, "stoplists")
  
      stoplist_names = []
      for filename in os.listdir(path_to_stoplists):
          name, extension = os.path.splitext(filename)
          if extension == ".txt":
              stoplist_names.append(name)
  
      return frozenset(stoplist_names)
  
  
  def get_stoplist(language):
      """Returns an built-in stop-list for the language as a set of words."""
      file_path = os.path.join("stoplists", "%s.txt" % language)
      try:
          stopwords = pkgutil.get_data("justext", file_path)
      except IOError:
          raise ValueError(
              "Stoplist for language '%s' is missing. "
              "Please use function 'get_stoplists' for complete list of stoplists "
              "and feel free to contribute by your own stoplist." % language
          )
  
      return frozenset(w.decode("utf8").lower() for w in stopwords.splitlines())
  
subject: implement suggestion: use one-liner in _replace_whitespace