title: How to strip a specific word from a string?
body: <p>I need to strip a specific word from a string.</p>
  
  <p>But I find python strip method seems can't recognize an ordered word. The just strip off any characters passed to the parameter.</p>
  
  <p>For example:</p>
  
  <pre><code>&gt;&gt;&gt; papa = "papa is a good man"
  &gt;&gt;&gt; app = "app is important"
  &gt;&gt;&gt; papa.lstrip('papa')
  " is a good man"
  &gt;&gt;&gt; app.lstrip('papa')
  " is important"
  </code></pre>
  
  <p>How could I strip a specified word with python?</p>