code: def __init__(self, v1, v2):
      """
      Initialize your data structure here.
      :type v1: List[int]
      :type v2: List[int]
      """
      self.queue = [_ for _ in (v1, v2) if _]
      print(self.queue)
  
label_desc: Use image node_id 1 to create a new ZigZagIterator object  with example: obj = ZigZagIterator(v1, v2)