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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_status(self):
 """ Returns the STATUS when serializing. Calculates based on the subsection type and if it's replacing anything. :returns: None or the STATUS string. """

        if self.status is not None:
            return self.status
        if self.subsection == "dmdSec":
            if self.older is None:
                return "original"
            else:
                return "updated"
        if self.subsection in ("techMD", "rightsMD"):
            # TODO how to handle ones where newer has been deleted?
            if self.newer is None:
                return "current"
            else:
                return "superseded"
        return None