old_contents: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  
  class BinaryTree(oject):
      """Binary Tree using class."""
      def __init__(self, root):
          self.key = root
          self.left_tree = None
          self.right_tree = None
  
      pass
  
  
  def main():
      pass
  
  
  if __name__ == '__main__':
      main()
  
new_contents: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  
  class BinaryTree(oject):
      """Binary Tree using class."""
      def __init__(self, root):
          self.key = root
          self.left_tree = None
          self.right_tree = None
  
      def insert_left(self, new_node):
          if self.left_tree is None:
              self.left_tree = BinaryTree(new_node)
          else:
              t = BinaryTree(new_node)
              t.left = self.left_tree
              self.left_tree = t
  
      def insert_right(self, new_node):
          if self.right_tree is None:
              self.right_tree = BinaryTree(new_node)
          else:
              t = BinaryTree(new_node)
              t.right_tree = self.right_tree
              self.right_tree = t
  
      def get_root_value(self):
          return self.key
  
      def set_root_value(self):
          # TODO: here
          pass
  
  
  def main():
      pass
  
  
  if __name__ == '__main__':
      main()
  
subject: Implement binary tree at Narity Airportx