Pandas groupby give any non nan values

Pandas groupby.first returns first not-null value but does not support None, try

df.fillna(np.nan).groupby('id').first()

    country name
id      
1   France  Pierre
2   UK      Marge
3   USA     Jim
4   Spain   Alvaro

Possible specifying to dropna when values are None

df.groupby('id').first(dropna=True)

   country    name
id                
1   France  Pierre
2       UK   Marge
3      USA     Jim
4    Spain  Alvaro