Answers for "count value pandas"

pandas count rows with value

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

count values pandas

>>> 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

pandas count values by column

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