Band of am และ Callsign ของ 6wh มีจุดประสงค์อะไร?
Band of am, and a Callsign of 6wh has what purpose?
df = pd.DataFrame(columns=['purpose', 'band', 'callsign'])
df[(df['band'] == 'am') & (df['callsign'] == '6wh')]['purpose']