text: import sys
  import urllib
  
  import django
  
  PY3 = sys.version_info[0] == 3
  
  if PY3:
      from urllib import parse as urlparse
  
      def to_string(s):
          if isinstance(s, str):
              return s
          return str(s, 'latin1')
  
      def to_wsgi_safe_string(s):
          return urlparse.quote(to_string(s))
  
      def from_wsgi_safe_string(s):
          return urlparse.unquote(s)
  
  else:
      import urlparse
  
      def to_string(s):
          return str(s)
  
      def to_wsgi_safe_string(s):
          return to_string(urllib.quote(s.encode('utf8')))
  
      def from_wsgi_safe_string(s):
          return urllib.unquote(s).decode('utf8')
  
  
  def is_authenticated(user):
      if django.VERSION < (1, 10):
          return user.is_authenticated()
      return user.is_authenticated
  