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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_mirror(self, target_root, source_root=None):
 """ Returns a File or Folder object that reperesents if the entire fragment of this directory starting with `source_root` were copied to `target_root`. source_root='/usr/local/hyde') Folder('/usr/tmp/stuff') """

        fragment = self.get_relative_path(
                        source_root if source_root else self.parent)
        return Folder(target_root).child(fragment)