code: def same_guid(post, parameter=DEFAULT_SIMILARITY_TIMESPAN):
  	'''Skip posts with exactly same GUID.
  		Parameter: comparison timespan, seconds (int, 0 = inf, default: {0}).'''
  	from feedjack.models import Post
  	if isinstance(parameter, types.StringTypes): parameter = int(parameter.strip())
  	similar = Post.objects.filtered(for_display=False)\
  		.exclude(id=post.id).filter(guid=post.guid)
  	if parameter:
  		similar = similar.filter(date_updated__gt=timezone.now() - timedelta(seconds=parameter))
  	return not bool(similar.exists()f same_guid(post, parameter=DEFAULT_SIMILARITY_TIMESPAN):
  	'''Skip posts with exactly same GUID.
  		Parameter: comparison timespan, seconds (int, 0 = inf, default: {0}).'''
  	from feedjack.models import Post
  	if isinstance(parameter, types.StringTypes): parameter = int(parameter.strip())
  	similar = Post.objects.filtered(for_display=False)\
  		.exclude(id=post.id).filter(guid=post.guid)
  	if parameter:
  		similar = similar.filter(date_updated__gt=timezone.now() - timedelta(seconds=parameter))
  	return not bool(similar.exists())
docs: Skip posts with exactly same GUID.
  		Parameter: comparison timespan, seconds (int, 0 = inf, default: {0}).