class_docstr: Trajectory compound by time frames and (x, y) pixels.
  
  It's designed as an interpolator, so you can get the position at a given
  time ``t``. You can instantiate it from a file using the methods
  ``from_file`` and ``load_list``.
  
  
  Parameters
  ----------
  
  tt : list or numpy.ndarray
    Time frames.
  
  xx : list or numpy.ndarray
    X positions in the trajectory.
  
  yy : list or numpy.ndarray
    Y positions in the trajectory.
  
  
  Examples
  --------
  
  >>> trajectory = Trajectory([0, .166, .333], [554, 474, 384], [100, 90, 91])
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docstr: Adds a value to the ``yy`` position of the trajectory.
  
  Parameters
  ----------
  
  y : int
    Value added to ``yy`` in the trajectory.
  
  
  Returns
  -------
  
  Trajectory : new instance with the new Y position included.
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code: def addy(self, y):
      """Adds a value to the ``yy`` position of the trajectory.
  
      Parameters
      ----------
  
      y : int
        Value added to ``yy`` in the trajectory.
  
  
      Returns
      -------
  
      Trajectory : new instance with the new Y position included.
      """
      return Trajectory(self.tt, self.xx, self.yy + y)
  
file_path: moviepy/moviepy/video/tools/interpolators.py
imports: import numpy
label_desc: Use image node_id 4 for calling the Trajectory obj's underlying member method code with example usage: obj.addy(y) and returns: Trajectory