# xarray.Variable.isnull

#### Variable.isnull(keep_attrs=None)[[source]](https://github.com/pydata/xarray/blob/main/xarray/core/variable.py#L2571-L2603)

Test each value in the array for whether it is a missing value.

* **Returns:**
  **isnull** ([`Variable`](xarray.Variable.html.md#xarray.Variable)) – Same type and shape as object, but the dtype of the data is bool.

#### SEE ALSO
[`pandas.isnull`](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.isnull.html#pandas.isnull)

### Examples

<div class="try_examples_button_container"><button class="try_examples_button" onclick="window.tryExamplesShowIframe('3fe5c9ee-8a08-495d-a2e2-f075261f1c30','6da156ca-6e32-4ba7-b358-811aefef68b6','074d4983-0594-434b-9a48-8bce5ad507f0','../lite/tree/../notebooks/index.html?path=0b8cb34f_d489_4628_ab7d_8b95a0950331.ipynb','None')">Try it in your browser!</button></div>
```pycon
>>> 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])
```

<div id="074d4983-0594-434b-9a48-8bce5ad507f0" class="try_examples_outer_iframe  hidden"><div class="try_examples_button_container"><button class="try_examples_button" onclick="window.tryExamplesHideIframe('3fe5c9ee-8a08-495d-a2e2-f075261f1c30','074d4983-0594-434b-9a48-8bce5ad507f0')">Go Back</button><button class="try_examples_button" onclick="window.openInNewTab('3fe5c9ee-8a08-495d-a2e2-f075261f1c30','074d4983-0594-434b-9a48-8bce5ad507f0')">Open In Tab</button></div><div id="6da156ca-6e32-4ba7-b358-811aefef68b6" class="jupyterlite_sphinx_iframe_container"></div></div><script>document.addEventListener("DOMContentLoaded", function() {window.loadTryExamplesConfig("../try_examples.json");});</script>