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23 changes: 21 additions & 2 deletions pandas/core/base.py
Original file line number Diff line number Diff line change
Expand Up @@ -1323,12 +1323,31 @@ def nunique(self, dropna=True):

Parameters
----------
dropna : boolean, default True
dropna : bool, default True
Don't include NaN in the count.

Returns
-------
nunique : int
int

See Also
--------
DataFrame.nunique: Method nunique for DataFrame.
Series.count: Count non-NA/null observations in the Series.

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

>>> s.nunique()
4
"""
uniqs = self.unique()
n = len(uniqs)
Expand Down