django apscheduler 定时任务（下篇）

    def add_job(self, func, trigger=None, args=None, kwargs=None, id=None, name=None,
                misfire_grace_time=undefined, coalesce=undefined, max_instances=undefined,
                next_run_time=undefined, jobstore=‘default‘, executor=‘default‘,
                replace_existing=False, **trigger_args):
        """
        add_job(func, trigger=None, args=None, kwargs=None, id=None,             name=None, misfire_grace_time=undefined, coalesce=undefined,             max_instances=undefined, next_run_time=undefined,             jobstore=‘default‘, executor=‘default‘,             replace_existing=False, **trigger_args)

        Adds the given job to the job list and wakes up the scheduler if it‘s already running.

        Any option that defaults to ``undefined`` will be replaced with the corresponding default
        value when the job is scheduled (which happens when the scheduler is started, or
        immediately if the scheduler is already running).

        The ``func`` argument can be given either as a callable object or a textual reference in
        the ``package.module:some.object`` format, where the first half (separated by ``:``) is an
        importable module and the second half is a reference to the callable object, relative to
        the module.

        The ``trigger`` argument can either be:
          #. the alias name of the trigger (e.g. ``date``, ``interval`` or ``cron``), in which case
            any extra keyword arguments to this method are passed on to the trigger‘s constructor
          #. an instance of a trigger class

        :param func: callable (or a textual reference to one) to run at the given time
        :param str|apscheduler.triggers.base.BaseTrigger trigger: trigger that determines when
            ``func`` is called
        :param list|tuple args: list of positional arguments to call func with
        :param dict kwargs: dict of keyword arguments to call func with
        :param str|unicode id: explicit identifier for the job (for modifying it later)
        :param str|unicode name: textual description of the job
        :param int misfire_grace_time: seconds after the designated runtime that the job is still
            allowed to be run (or ``None`` to allow the job to run no matter how late it is)
        :param bool coalesce: run once instead of many times if the scheduler determines that the
            job should be run more than once in succession
        :param int max_instances: maximum number of concurrently running instances allowed for this
            job
        :param datetime next_run_time: when to first run the job, regardless of the trigger (pass
            ``None`` to add the job as paused)
        :param str|unicode jobstore: alias of the job store to store the job in
        :param str|unicode executor: alias of the executor to run the job with
        :param bool replace_existing: ``True`` to replace an existing job with the same ``id``
            (but retain the number of runs from the existing one)
        :rtype: Job

        """
        job_kwargs = {
            ‘trigger‘: self._create_trigger(trigger, trigger_args),
            ‘executor‘: executor,
            ‘func‘: func,
            ‘args‘: tuple(args) if args is not None else (),
            ‘kwargs‘: dict(kwargs) if kwargs is not None else {},
            ‘id‘: id,
            ‘name‘: name,
            ‘misfire_grace_time‘: misfire_grace_time,
            ‘coalesce‘: coalesce,
            ‘max_instances‘: max_instances,
            ‘next_run_time‘: next_run_time
        }
        job_kwargs = dict((key, value) for key, value in six.iteritems(job_kwargs) if
                          value is not undefined)
        job = Job(self, **job_kwargs)

        # Don‘t really add jobs to job stores before the scheduler is up and running
        with self._jobstores_lock:
            if self.state == STATE_STOPPED:
                self._pending_jobs.append((job, jobstore, replace_existing))
                self._logger.info(‘Adding job tentatively -- it will be properly scheduled when ‘
                                  ‘the scheduler starts‘)
            else:
                self._real_add_job(job, jobstore, replace_existing)

        return job