Scalar# class pylibcudf.scalar.Scalar(*args, **kwargs)# A scalar value in device memory. This is the Cython representation of cudf::scalar. Methods is_valid(self) True if the scalar is valid, false if not type(self) The type of data in the column. is_valid(self) → bool# True if the scalar is valid, false if not type(self) → DataType# The type of data in the column.