มีตำแหน่งสูงสุดกี่ตำแหน่งในแผนภูมิรายสัปดาห์?
How many peak positions were there on the weekly charts?
df = pd.DataFrame(columns=['peak_position', 'oricon_albums_chart'])
df[df['oricon_albums_chart'] == 'Weekly Charts']['peak_position'].count()