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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 getLinkedAnalyses(self):
 """Lookup linked Analyses :returns: sorted list of ANs, where the latest AN comes first """

        # Fetch the linked Analyses UIDs
        refs = get_backreferences(self, "AnalysisAttachment")
        # fetch the objects by UID and handle nonexisting UIDs gracefully
        ans = map(lambda uid: api.get_object_by_uid(uid, None), refs)
        # filter out None values (nonexisting UIDs)
        ans = filter(None, ans)
        # sort by physical path, so that attachments coming from an AR with a
        # higher "-Rn" suffix get sorted correctly.
        # N.B. the created date is the same, hence we can not use it
        return sorted(ans, key=api.get_path, reverse=True)