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Pandas count

Pandas count rows with value

len(df[df['score'] == 1.0])

1

Source: morphocode.com

Python count variable and put the count in a column of data frame

df['freq'] = df.groupby('myvar')['myvar'].transform('count')

1

Source: stackoverflow.com

Pandas count

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

1

Source: pandas.pydata.org

Pandas count values by column

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

0

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