How to use 'nunique pandas' in Python

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673def _unique(df, columns=None):
674 if isinstance(columns, str):
675 columns = [columns]
676 if not columns:
677 columns = df.columns.tolist()
678 info = {}
679 for col in columns:
680 values = df[col].dropna().values
681 uniques = np.unique(list(_flatten_list(values))).tolist()
682 info[col] = {'count': len(uniques), 'values': uniques}
683 return info
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280def nunique(self):
281 """
282 Find the number of unique values in each column
283
284 Returns
285 -------
286 A DataFrame
287 """
288 pass

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