class_docstr: This class implements an iterator object that can be used to loop
  over an image sequence.
  
  You can use the ``[]`` operator to access elements by index. This operator
  will raise an :py:exc:`IndexError` if you try to access a nonexistent
  frame.
  
  :param im: An image object.
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code: def __iter__(self):
      return self
  
label_desc: Use image node_id 3 for calling the Iterator obj's underlying member method code with example usage: obj.__iter__() and returns: self