title: 'DataFrame' object has no attribute 'melt'
body: <p>I just want to use the melt function in pandas and I just keep on getting the same error. </p>
  
  <p>Just typing the example provided by the documentation:</p>
  
  <pre><code>cheese = pd.DataFrame({'first' : ['John', 'Mary'],
                        'last' : ['Doe', 'Bo'],
                         'height' : [5.5, 6.0],
                         'weight' : [130, 150]})
  </code></pre>
  
  <p>I just get the error:</p>
  
  <pre><code>---------------------------------------------------------------------------
  AttributeError                            Traceback (most recent call last)
  &lt;ipython-input-119-dc0a0b96cf46&gt; in &lt;module&gt;()
  ----&gt; 1 cheese.melt(id_vars=['first', 'last'])
  C:\Anaconda2\lib\site-packages\pandas\core\generic.pyc in __getattr__(self, name)
  
  2670             if name in self._info_axis:
  2671                 return self[name]
  -&gt; 2672             return object.__getattribute__(self, name)
  2673
  2674     def __setattr__(self, name, value):
  
  AttributeError: 'DataFrame' object has no attribute 'melt'`
  </code></pre>