Method isnull

xarray/core/variable.py:2341–2373

Test each value in the array for whether it is a missing value. Returns ------- isnull : Variable Same type and shape as object, but the dtype of the data is bool. See Also -------- pandas.isnull Examples --------

(self, keep_attrs: bool | None = None)

        return duck_array_ops.reshape(variable.data, shape), tuple(axes)

    def isnull(self, keep_attrs: bool | None = None):
        """Test each value in the array for whether it is a missing value.

        Returns
        -------
        isnull : Variable
            Same type and shape as object, but the dtype of the data is bool.

        See Also
        --------
        pandas.isnull

        Examples
        --------
        >>> var = xr.Variable("x", [1, np.nan, 3])
        >>> var
        <xarray.Variable (x: 3)> Size: 24B
        array([ 1., nan,  3.])
        >>> var.isnull()
        <xarray.Variable (x: 3)> Size: 3B
        array([False,  True, False])
        """
        from xarray.computation.apply_ufunc import apply_ufunc

        if keep_attrs is None:
            keep_attrs = _get_keep_attrs(default=True)

        return apply_ufunc(
            duck_array_ops.isnull,
            self,
            dask="allowed",
            keep_attrs=keep_attrs,
        )

    def notnull(self, keep_attrs: bool | None = None):
        """Test each value in the array for whether it is not a missing value.