# xarray.CFTimeIndex.nunique

#### CFTimeIndex.nunique(dropna=True)[[source]](https://github.com/pydata/xarray/blob/main/xarray/../.pixi/envs/doc/lib/python3.14/site-packages/pandas/core/base.py#L1162-L1201)

Return number of unique elements in the object.

Excludes NA values by default.

* **Parameters:**
  **dropna** ([`bool`](https://docs.python.org/3/builtins/functions.html#bool), *default* [`True`](https://docs.python.org/3/builtins/constants.html#True)) – Don’t include NaN in the count.
* **Returns:**
  [`int`](https://docs.python.org/3/builtins/functions.html#int) – An integer indicating the number of unique elements in the object.

#### SEE ALSO
`DataFrame.nunique`
: Method nunique for DataFrame.

`Series.count`
: Count non-NA/null observations in the Series.

### Examples

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```pycon
>>> s = pd.Series([1, 3, 5, 7, 7])
>>> s
0    1
1    3
2    5
3    7
4    7
dtype: int64
```

```pycon
>>> s.nunique()
4
```

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