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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 set_preserver_info(self, sample):
 """Updates the Preserver and the Date Preserved with the values provided in the request. If neither Preserver nor DatePreserved are present in the request, returns False """

        if sample.getPreserver() and sample.getDatePreserved():
            # Preserver and Date Preserved already set. This is correct
            return True
        preserver = self.get_form_value("Preserver", sample,
                                        sample.getPreserver())
        preserved = self.get_form_value("getDatePreserved",
                                        sample.getDatePreserved())
        if not all([preserver, preserved]):
            return False
        sample.setPreserver(preserver)
        sample.setDatePreserver(DateTime(preserved))
        return True