Initial Commit

lib/apscheduler/triggers/base.py

@@ -0,0 +1,16 @@
+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."""
+
+    @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
+        """