pandas count values by column

>>> index = pd.Index([3, 1, 2, 3, 4, np.nan])
>>> index.value_counts()
3.0    2
4.0    1
2.0    1
1.0    1
dtype: int64

3.5
2
Krish 100200 points

                                    >>> df.set_index(["Person", "Single"]).count(level="Person")
        Age
Person
John      2
Lewis     1
Myla      1

3.5 (2 Votes)
0
4.67
3
Phoenix Logan 186120 points

                                    df = pd.DataFrame({'a':list('abssbab')})
df.groupby('a').count()

4.67 (3 Votes)
0
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