input: Write a python function to extract book prices from an Amazon best sellers page.
  assert extract_book_prices('https://www.amazon.com/best-sellers-books-Amazon/zgbs/books/ref=zg_bs_nav_0') == ['List of expected prices']
output: def extract_book_prices(url):
      import requests
      from bs4 import BeautifulSoup
      
      response = requests.get(url)
      soup = BeautifulSoup(response.content, 'html.parser')
      
      prices = []
      for price_tag in soup.find_all('span', class_='p13n-sc-price'):
          prices.append(price_tag.text.strip())
      
      return prices