Abstract base class that defines the interface that every executor must implement.
Shuts down this executor.
wait (bool) –
Trueto wait until all submitted jobs have been executed
Called by the scheduler when the scheduler is being started or when the executor is being added to an already running scheduler.
scheduler (apscheduler.schedulers.base.BaseScheduler) – the scheduler that is starting this executor
alias (str|unicode) – alias of this executor as it was assigned to the scheduler