#TO count repetition of each unique values(to find How many times the same-
# unique value is appearing in the data)
item_counts = df["Your_Column"].value_counts()
#Returns Dictionary => {"Value_name" : number_of_appearences} df['column'].nunique()data = df.groupby('ColumnName')['IDColumnName'].nunique()
print(data)pd.value_counts(df.Account_Type)
Gold 3
Platinum 1
Name: Account_Type, dtype: int64df = df.groupby('domain')['ID'].nunique()
print (df)
domain
'facebook.com' 1
'google.com' 1
'twitter.com' 2
'vk.com' 3
Name: ID, dtype: int64dataframe.column.nunique()