title: Python: "Unused variable" warning in PyDev
body: <p>Here is my code, and there is a "compiler" warning (is that the correct term for it?) under the instantiation of <code>normDataSet</code> below:</p>
  
  <pre><code>def autoNorm(dataSet):
      minVals = dataSet.min(0)
      maxVals = dataSet.max(0)
      ranges = maxVals - minVals
      normDataSet = np.zeros(np.shape(dataSet)) # Warning under "normDataSet" here.
      m = dataSet.shape[0]
      normDataSet = dataSet - np.tile(minVals, (m, 1))
      normDataSet = normDataSet / np.tile(ranges, (m, 1)) 
      return normDataSet, ranges, minVals
  </code></pre>
  
  <p>The full warning in PyDev reads: <code>Unused variable: normDataSet</code>
  Is there a way to eliminate this warning without having to suppress it with <code>@UnusedVariable</code>? Or am I missing something?</p>