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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 fetch_uptodate(self, ):
 """Set and return whether the currently loaded entity is the newest version in the department. :returns: True, if newest version. False, if there is a newer version. None, if there is nothing loaded yet. :rtype: bool | None :raises: None """

        tfi = self.get_taskfileinfo()
        if tfi:
            self._uptodate = tfi.is_latest()
        else:
            self._uptodate = None
        return self._uptodate