แสดงชื่อศิลปินที่ไม่มีนิทรรศการใดๆ
Show names for artists without any exhibition.
df_artist = pd.DataFrame(columns=['name', 'artist_id']); df_exhibition = pd.DataFrame(columns=['artist_id'])
df_artist[~df_artist['artist_id'].isin(df_exhibition['artist_id'])]['name']