Series.nunique(dropna=True) [source]
Return number of unique elements in the object.
Excludes NA values by default.
| Parameters: |
dropna : boolean, default True Don’t include NaN in the count. |
|---|---|
| Returns: |
|
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http://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.Series.nunique.html