def income_nan(row):
    days = row['days_employed']
    type = row['income_type']


    if days == pd.isna:
        if type == 'сотрудник':
            return retired_mean
    else:
        if days == pd.isna:
            if type == 'безработный':
                return unemployed_mean
data['days_employed_new'] = data.apply(income_nan, axis=1)