input: Write a function to scrape text from a blog URL.
  assert scrape_blog('http://example.com/blog1') == 'Expected text from blog 1'
  assert scrape_blog('http://example.com/blog2') == 'Expected text from blog 2'
  assert scrape_blog('http://example.com/blog3') == 'Expected text from blog 3'
output: def scrape_blog(url):
      import requests
      from bs4 import BeautifulSoup
  
      response = requests.get(url)
      soup = BeautifulSoup(response.content, 'html.parser')
  
      # Assuming the blog text is within a specific tag, for example, <article>
      article = soup.find('article')
      if article:
          return article.get_text(strip=True)
      return ''