def sum(self) -> SumRequestBuilder:
        """
        Provides operations to call the sum method.
        """
        from .sum.sum_request_builder import SumRequestBuilder

        return SumRequestBuilder(self.request_adapter, self.path_parameters)

        Provides operations to call the sum method.
        
msgraph/generated/drives/item/items/item/workbook/functions/functions_request_builder.py