Python

sum(df['sex'] == 'man')

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

number_of_rows = len(df)

In [37]:
df = pd.DataFrame({'a':list('abssbab')})
df.groupby('a').count()

Out[37]:

   a
a   
a  2
b  3
s  2

[3 rows x 1 columns]

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