group by unique values pandas code example

Example 1: pandas unique values in column

#List unique values in the df['name'] column
df.name.unique()

Example 2: pandas groupby count unique rows

df = df.groupby(by='domain', as_index=False).agg({'ID': pd.Series.nunique})
print(df)
    domain  ID
0       fb   1
1      ggl   1
2  twitter   2
3       vk   3