GroupBy.
count
Compute count of group, excluding missing values.
See also
databricks.koalas.Series.groupby
databricks.koalas.DataFrame.groupby
Examples
>>> df = ks.DataFrame({'A': [1, 1, 2, 1, 2], ... 'B': [np.nan, 2, 3, 4, 5], ... 'C': [1, 2, 1, 1, 2]}, columns=['A', 'B', 'C']) >>> df.groupby('A').count().sort_index() B C A 1 2 3 2 2 2