pandas count values by column

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Jonas
13 Aug 2020
1>>> index = pd.Index([3, 1, 2, 3, 4, np.nan])
2>>> index.value_counts()
33.0    2
44.0    1
52.0    1
61.0    1
7dtype: int64
8
source
Lolita
16 Nov 2019
1df = pd.DataFrame({'a':list('abssbab')})
2df.groupby('a').count()
source
Enrico
13 Jun 2016
1>>> df.set_index(["Person", "Single"]).count(level="Person")
2        Age
3Person
4John      2
5Lewis     1
6Myla      1
7
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