title: how to extract an attribute value of div using BeautifulSoup
body: <p>I have a div whose id is "img-cont"</p>
  
  <pre><code>&lt;div class="img-cont-box" id="img-cont" style='background-image: url("http://example.com/example.jpg");'&gt;
  </code></pre>
  
  <p>I want to extract the url in background-image using beautiful soup.How can I do it?</p>