old_contents: from django.db import models
  from django.utils.translation import ugettext_lazy as _
  
  
  class Schedule(models.Model):
      minute = models.CharField(_('minute'), max_length=64, default='*')
      hour = models.CharField(_('hour'), max_length=64, default='*')
      day_of_week = models.CharField(
          _('day of week'), max_length=64, default='*',
      )
      day_of_month = models.CharField(
          _('day of month'), max_length=64, default='*',
      )
      month_of_year = models.CharField(
          _('month of year'), max_length=64, default='*',
      )
  
      class Meta:
          verbose_name = _('schedule')
          verbose_name_plural = _('schedules')
          ordering = ['month_of_year', 'day_of_month',
                      'day_of_week', 'hour', 'minute']
  
      def __unicode__(self):
          rfield = lambda f: f and str(f).replace(' ', '') or '*'
          return '{0} {1} {2} {3} {4} (m/h/d/dM/MY)'.format(
              rfield(self.minute), rfield(self.hour), rfield(self.day_of_week),
              rfield(self.day_of_month), rfield(self.month_of_year),
          )
  
new_contents: from django.db import models
  from django.utils.translation import ugettext_lazy as _
  
  
  class Schedule(models.Model):
  
      """
      Schdules (sometimes referred to as Protocols) are the method used to
      define the rate and frequency at which the messages are sent to
      the recipient
      """
      minute = models.CharField(_('minute'), max_length=64, default='*')
      hour = models.CharField(_('hour'), max_length=64, default='*')
      day_of_week = models.CharField(
          _('day of week'), max_length=64, default='*',
      )
      day_of_month = models.CharField(
          _('day of month'), max_length=64, default='*',
      )
      month_of_year = models.CharField(
          _('month of year'), max_length=64, default='*',
      )
  
      class Meta:
          verbose_name = _('schedule')
          verbose_name_plural = _('schedules')
          ordering = ['month_of_year', 'day_of_month',
                      'day_of_week', 'hour', 'minute']
  
      def __unicode__(self):
          rfield = lambda f: f and str(f).replace(' ', '') or '*'
          return '{0} {1} {2} {3} {4} (m/h/d/dM/MY)'.format(
              rfield(self.minute), rfield(self.hour), rfield(self.day_of_week),
              rfield(self.day_of_month), rfield(self.month_of_year),
          )
  
subject: Add docstring to Schedule model