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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 percentage(self, percentage):
 """ Sets the percentage of this OrderLineItemTax. The percentage of the tax, as a string representation of a decimal number. A value of `7.25` corresponds to a percentage of 7.25%. :param percentage: The percentage of this OrderLineItemTax. :type: str """


        if percentage is None:
            raise ValueError("Invalid value for `percentage`, must not be `None`")
        if len(percentage) > 10:
            raise ValueError("Invalid value for `percentage`, length must be less than `10`")

        self._percentage = percentage