Answers for "for each entry in a columna how many unique entry in column b pandas"

1

get count of unique values in column pandas

df = df.groupby('domain')['ID'].nunique()

print (df)
domain
'facebook.com'    1
'google.com'      1
'twitter.com'     2
'vk.com'          3
Name: ID, dtype: int64
Posted by: Guest on May-28-2020
1

values of unique from dataframe with count

data = df.groupby('ColumnName')['IDColumnName'].nunique()
print(data)
Posted by: Guest on November-07-2020

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