mars.dataframe.DataFrame.nunique#
- DataFrame.nunique(axis=0, dropna=True, combine_size=None)#
Count distinct observations over requested axis.
Return Series with number of distinct observations. Can ignore NaN values.
- 参数
- 返回类型
参见
Series.nunique
Method nunique for Series.
DataFrame.count
Count non-NA cells for each column or row.
实际案例
>>> import mars.dataframe as md >>> df = md.DataFrame({'A': [1, 2, 3], 'B': [1, 1, 1]}) >>> df.nunique().execute() A 3 B 1 dtype: int64
>>> df.nunique(axis=1).execute() 0 1 1 2 2 2 dtype: int64