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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 request_entity(self, request_entity):
 """ Sets the request_entity of this FileSourceCreateOrUpdateRequest. :param request_entity: The request_entity of this FileSourceCreateOrUpdateRequest. :type: str """

        if request_entity is not None and len(request_entity) > 10000:
            raise ValueError("Invalid value for `request_entity`, length must be less than or equal to `10000`")

        self._request_entity = request_entity