title: unicode string equivalent of contain
body: <p>I have an error when trying to use contain in python. </p>
  
  <pre><code>s = u"some utf8 words"
  k = u"one utf8 word"
  
  if s.contains(k):
      print "contains" 
  </code></pre>
  
  <p>How do i achieve the same result?</p>
  
  <p>Example with normal ASCII string</p>
  
  <pre><code>s = "haha i am going home"
  k = "haha"
  
  if s.contains(k):
      print "contains"
  </code></pre>
  
  <p>I am using python 2.7.x</p>