[Solved] Count unique strings by column in pandas DataFrame [closed]

by


Given the following dataframe:

df = pd.DataFrame({
    'B': ['a', 'a', 'c', 'd', 'a'],
    'C': ['aa', 'bb', '', 'dd', 'do'],
})
   B   C
0  a  aa
1  a  bb
2  c  cb
3  d  dd
4  a  do

value_counts method counts the occurrences of all values ​​in column ‘B‘:

df.B.value_counts()

a    3
d    1
c    1

solved Count unique strings by column in pandas DataFrame [closed]