ระบุโฆษกของช่องทั้งหมดซึ่งมีผู้วิจารณ์คือ dmitriy guberniyev
state all the spokesperson for the channel where commentator is dmitriy guberniyev
df = pd.DataFrame(columns=['spokesperson', 'commentator'], dtype=object)
df.loc[df['commentator'] == 'Dmitriy Guberniyev', 'spokesperson']