def __init__(self, days_before_starting=None, frequency_days=None, max_reminders=None):
"""function that calculates values
and assigns them to user-friendly variable names
* ``days_before_starting`` - days to wait before sending any reminders
* ``frequency_days`` - days to wait between sending reminders
* ``max_reminders`` - maximum number of reminders to send
"""
self.wait_period = datetime.timedelta(days_before_starting)
self.end_cutoff_date = timezone.now() - self.wait_period
self.recurrence_delay = datetime.timedelta(frequency_days)
self.max_reminders = max_reminders
self.start_cutoff_date = self.end_cutoff_date - \
(self.max_reminders - 1)*self.recurrence_delay
def get_queryset(self):
"""Return the last five published polls."""
return Poll.objects.filter(
pub_date__lte=timezone.now()
).order_by('-pub_date')[:5]
