Answers for "count number of values in a column pandas"

Find the value counts for the column 'your_column'

df["your_column"].value_counts()

number of times a value occurs in dataframne

df['a'].value_counts()

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()

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

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