История изменений

def compare(a, b):
  if a is None:
    return b is None
  if b is None:
    return False

  return a.data == b.data and compare(a.left, b.left) and compare(a.right, b.right)

def compare(a, b):
  if a is None:
    return b is None

  return a.data == b.data and compare(a.left, b.left) and compare(a.right, b.right)