old_contents: class Leaf(object):
      '''Create leaf.'''
      def __init__(self, left=None, value=None, right=None):
          self.left = left
          self.value = value
          self.right = right
  
  
  class Tree(object):
      '''Create tree'''
      def __init__(self, root=None):
          self.root = root
  
      def insert(self, value, compare=value):
          if self.root is None:
              self.root = Leaf(value=value)
  
new_contents: class Leaf(object):
      '''Create leaf.'''
      def __init__(self, left=None, value=None, right=None):
          self.left = left
          self.value = value
          self.right = right
  
  
  class Tree(object):
      '''Create tree'''
      def __init__(self, root=None):
          self.root = root
  
      def search(self, value):
          pass
  
      def insert(self, value):
  
          if self.root is None:
              self.root = Leaf(value=value)
          elif 
  
subject: initialize search.