title: how to using python to diff two html files
body: <p>i want use python to diff two html files: </p>
  
  <p>example :</p>
  
  <pre><code>html_1 = """
  &lt;p&gt;i love it&lt;/p&gt;
  """
  html_2 = """ 
  &lt;h2&gt;i love it &lt;/p&gt;
  """
  </code></pre>
  
  <p>the diff file will like this :</p>
  
  <pre><code>diff_html = """
  &lt;del&gt;&lt;p&gt;i love it&lt;/p&gt;&lt;/dev&gt;&lt;ins&gt;&lt;h2&gt;i love it&lt;/h2&gt;&lt;/ins&gt;
  """
  </code></pre>
  
  <p>is there such python lib help me do this ?</p>