def dsum(self) -> DsumRequestBuilder:
        """
        Provides operations to call the dsum method.
        """
        from .dsum.dsum_request_builder import DsumRequestBuilder

        return DsumRequestBuilder(self.request_adapter, self.path_parameters)

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