# templatetags file from django import template register = template.Library() @register.filter(name='chunks') def chunks(iterable, chunk_size): if not hasattr(iterable, '__iter__'): # can't use "return" and "yield" in the same function yield iterable else: i = 0 chunk = [] for item in iterable: chunk.append(item) i += 1 if not i % chunk_size: yield chunk chunk = [] if chunk: # some items will remain which haven't been yielded yet, # unless len(iterable) is divisible by chunk_size yield chunk # template {% for chunk in images|chunks:3 %} {% for image in chunk %} {% endfor %} {% for image in chunk %} {% endfor %} {% endfor %}