Observes an Event for new data (e.g. new punches).
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          | __init__(self,
        store,
        interval=5,
        rollback=True) x.__init__(...) initializes x; see help(type(x)) for signature
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          | register(self,
        obj,
        observable) Register an object to be notified of changes of type event.
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          | unregister(self,
        obj,
        observable) Unregister an object from this observer for this observable.
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          | _notify(self,
        observable) Notifies objects of an event.
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    | Inherited from object:__delattr__,__format__,__getattribute__,__hash__,__new__,__reduce__,__reduce_ex__,__repr__,__setattr__,__sizeof__,__str__,__subclasshook__ |