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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 note(self, note):
 """ Sets the note of this OrderFulfillmentPickupDetails. A general note about the pickup fulfillment. Notes are useful for providing additional instructions and are displayed in Square apps. :param note: The note of this OrderFulfillmentPickupDetails. :type: str """


        if note is None:
            raise ValueError("Invalid value for `note`, must not be `None`")
        if len(note) > 500:
            raise ValueError("Invalid value for `note`, length must be less than `500`")

        self._note = note