title: Use isinstance to test for Unicode string
body: <p>How can I do something like:</p>
  
  <pre><code>&gt;&gt;&gt; s = u'hello'
  &gt;&gt;&gt; isinstance(s,str)
  False
  </code></pre>
  
  <p>But I would like <code>isinstance</code> to return <code>True</code> for this Unicode encoded string. Is there a Unicode string object type?</p>