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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 add_allowance(self, caller):
 """Adds a new allowance for the method. :param: tuple caller: A tuple indicating where the method was called :return: The new ``Allowance``. :rtype: Allowance """


        allowance = Allowance(self._target, self._method_name, caller)
        self._allowances.insert(0, allowance)
        return allowance