def __init__(self, event_count=0, first_timestamp=-1, last_timestamp=-1):
    """Tracks events for a single category of values.

    Args:
      event_count: The initial event count to use.
      first_timestamp: The timestamp of the first event with this value.
      last_timestamp: The timestamp of the last event with this category of
          values.
    """

    # When updating the properties of this class, make sure to keep
    # EventTrackerDescription in sync so that data can be written to and from
    # disk correctly.
    self.event_count = event_count
    self.first_timestamp = first_timestamp
    self.last_timestamp = last_timestamp
def __init__ ( self , event_count = 0 , first_timestamp = - 1 , last_timestamp = - 1 ) : self . event_count = event_count self . first_timestamp = first_timestamp self . last_timestamp = last_timestamp
Tracks events for a single category of values.

    Args:
      event_count: The initial event count to use.
      first_timestamp: The timestamp of the first event with this value.
      last_timestamp: The timestamp of the last event with this category of
          values.