Licz liczba wierszy stanu pandy
sum(df['sex'] == 'man')
Rigolo2015
sum(df['sex'] == 'man')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]