เว็บไซต์มีเฮดโค้ชกี่คน http://www.burleighbulldogs.org/?
How many head coaches are there for the website, http://www.burleighbulldogs.org/?
df = pd.DataFrame(columns=['head_coach', 'website'])
df[df['website'] == 'http://www.burleighbulldogs.org/']['head_coach'].count()