'Helper method for :meth:`_print_daily_stats`. Given a data point and
the correct day dict, update attribs on the dict with the contents
of the data point.
:param dict data_point: The data point to add to the day\'s stats dict.
:param dict day_dict: A stats-tracking dict for a 24 hour period.'

def _update_day_dict(self, data_point, day_dict):

    for topic in ['Bounces', 'Complaints', 'DeliveryAttempts', 'Rejects']:
        day_dict[topic] = (day_dict.get(topic, 0) + int(data_point[topic]))
