How to use the crontab.CronTab.__init__ function in crontab

def __init__(self, creation_time, user=None, fake_tab=None):
        CronTab.__init__(self, user, fake_tab)
        self._creation_time = creation_time
        for schedule in self.crons:
            self._scheduleSanityCheck(schedule)

def __init__(self, creation_time, user=None, fake_tab=None):
        CronTab.__init__(self, user, fake_tab)
        self._schedule_string = fake_tab
        self._creation_time = creation_time
        self._schedules = []
        for schedule in self.crons:
            self._schedules.append(self._scheduleSanityCheck(schedule))

def __init__(self, creation_time, user=None, fake_tab=None):
        CronTab.__init__(self, user, fake_tab)
        self._creation_time = creation_time
        for schedule in self.crons:
            self._scheduleSanityCheck(schedule)