new_contents: # -*- coding: utf-8 -*-
  
  from werkzeug.routing import BaseConverter
  
  
  class ListConverter(BaseConverter):
  
      _subtypes = {
          'int': int,
          'str': str,
          'u': unicode,
      }
  
      def __init__(self, url_map, subtype=None, mutable=False):
          super(ListConverter, self).__init__(url_map)
          self.subtype = subtype
          self.mutable = mutable
          if subtype:
              rearg = {'int': '\d', 'str': '\w', 'u': '\w'}[subtype]
          else:
              rearg = '[\d\w]'
          self.regex = '{0}+(?:,{0}*)+'.format(rearg)
  
      def to_python(self, value):
          retval = filter(None, value.split(','))
          if self.subtype in self._subtypes:
              retval = map(self._subtypes[self.subtype], retval)
          if not self.mutalbe:
              retval = tuple(retval)
          return retval
  
      def to_url(self, value):
          return ','.join(BaseConverter.to_url(value) for value in values)
  
subject: Add ListConverter to url parser