ใครคือผู้วิจารณ์สีของ ESPN ก่อนปี 2012
Who were the collor commentator(s) for ESPN before 2012?
df = pd.DataFrame(columns=['color_commentator_s_', 'year', 'network'])
df[(df['year'] < '2012') & (df['network'] == 'espn')]['color_commentator_s_']