title: AttributeError: 'cv2.FileStorage' object has no attribute 'getNode'
body: <p>I am building a project based on python3.4 and opencv3.0 in the PycharmCE2017 on my Ubuntu14.04 machine. When running the code below,</p>
  
  <pre><code>import cv2
  
  if __name__ == "__main__":
      savePath = "/home/s/Desktop/Imgcov/"
      filename = savePath + "depth.xml"
      fs = cv2.FileStorage(filename, cv2.FILE_STORAGE_READ)
      matrix = fs.getNode("data") 
  </code></pre>
  
  <p>I get the error:</p>
  
  <pre><code>AttributeError: 'cv2.FileStorage' object has no attribute 'getNode'
  </code></pre>
  
  <p>How can I fix this? Any tips are appreciated. </p>