title: Mediapipe hands python result does not have multi_hand_world_landmarks
body: <p>I try to use MediaPipe in Python.</p>
  <p>It works fine, but the result of  <code>hands.process()</code> has <code>multi_hand_world_landmarks</code>, and does not have <code>multi_hand_world_landmarks</code> and I get</p>
  <pre><code>AttributeError: type object 'SolutionOutputs' has no attribute 'multi_hand_world_landmarks' 
  </code></pre>
  <p>Why?</p>
  <p>The comment in the source
  <a href="https://github.com/google/mediapipe/blob/master/mediapipe/python/solutions/hands.py" rel="nofollow noreferrer">https://github.com/google/mediapipe/blob/master/mediapipe/python/solutions/hands.py</a>
  says the result must have this property:</p>
  <pre><code>Returns:
    A NamedTuple object with the following fields:
      1) a &quot;multi_hand_landmarks&quot; field that contains the hand landmarks on
         each detected hand.
      2) a &quot;multi_hand_world_landmarks&quot; field that contains the hand landmarks
         on each detected hand in real-world 3D coordinates that are in meters
         with the origin at the hand's approximate geometric center.
      3) a &quot;multi_handedness&quot; field that contains the handedness (left v.s.
         right hand) of the detected hand.
  </code></pre>
  <p>May be it appears in pictures with a special background only?</p>