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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_message(self):
 """ Gets the latest object from the backend, and handles unpickling and validation. """

        try:
            m = self.get_from_backend()
            if m and m["type"] not in SKIP_TYPES:
                return self.decrypt(m["data"])

        except AttributeError:
            raise Exception("Tried to call get message without having subscribed first!")
        except (KeyboardInterrupt, SystemExit):
            pass
        except:
            logging.critical("Error in watching pubsub get message: \n%s" % traceback.format_exc())
        return None