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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 script(self):
 """Returns a Script object representing a contract script portion of a payment to the destination."""

        # The script object is cached, since constructing it may involve
        # a number of string-manipulation operations.
        if getattr(self, '_script', None) is None:
            self._script = self._script__getter()
        return self._script