new_contents: # -*- coding: utf-8 -*-
  """
  Utils template tags
  """
  
  # standard library
  
  
  # django
  from django import template
  
  
  register = template.Library()
  
  
  @register.filter
  def group(array, group_length):
      """Yield successive n-sized chunks from l."""
      if array is None:
          array = []
  
      for i in range(0, len(array), group_length):
          yield array[i:i + group_length]
  
subject: Add group template tag