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- from abc import ABCMeta, abstractmethod
- import six
- class BaseTrigger(six.with_metaclass(ABCMeta)):
- """Abstract base class that defines the interface that every trigger must implement."""
- __slots__ = ()
- @abstractmethod
- def get_next_fire_time(self, previous_fire_time, now):
- """
- Returns the next datetime to fire on, If no such datetime can be calculated, returns
- ``None``.
- :param datetime.datetime previous_fire_time: the previous time the trigger was fired
- :param datetime.datetime now: current datetime
- """
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