可以把上述的输出样式改成：输出平衡二叉树： 各节点因子为：的代码吗

当然可以，以下是将输出样式修改为“输出平衡二叉树： 各节点因子为：”的代码示例：

class Node:
    def __init__(self, value):
        self.value = value
        self.left = None
        self.right = None
        self.height = 1

class AVLTree:
    def __init__(self):
        self.root = None

    def insert(self, value):
        def _insert(root, value):
            if not root:
                return Node(value)
            elif value < root.value:
                root.left = _insert(root.left, value)
            else:
                root.right = _insert(root.right, value)

            # update height
            root.height = 1 + max(self.get_height(root.left), self.get_height(root.right))

            # check balance factor
            balance_factor = self.get_balance_factor(root)

            # balance the tree
            if balance_factor > 1 and value < root.left.value:
                return self.right_rotate(root)
            if balance_factor < -1 and value > root.right.value:
                return self.left_rotate(root)
            if balance_factor > 1 and value > root.left.value:
                root.left = self.left_rotate(root.left)
                return self.right_rotate(root)
            if balance_factor < -1 and value < root.right.value:
                root.right = self.right_rotate(root.right)
                return self.left_rotate(root)

            return root

        self.root = _insert(self.root, value)

    def left_rotate(self, root):
        new_root = root.right
        root.right = new_root.left
        new_root.left = root

        root.height = 1 + max(self.get_height(root.left), self.get_height(root.right))
        new_root.height = 1 + max(self.get_height(new_root.left), self.get_height(new_root.right))

        return new_root

    def right_rotate(self, root):
        new_root = root.left
        root.left = new_root.right
        new_root.right = root

        root.height = 1 + max(self.get_height(root.left), self.get_height(root.right))
        new_root.height = 1 + max(self.get_height(new_root.left), self.get_height(new_root.right))

        return new_root

    def get_height(self, root):
        if not root:
            return 0
        return root.height

    def get_balance_factor(self, root):
        if not root:
            return 0
        return self.get_height(root.left) - self.get_height(root.right)

    def print_tree(self):
        def _print_tree(root):
            if not root:
                return
            print(root.value, end=': ')
            if root.left:
                print(root.left.value, end=', ')
            else:
                print('None', end=', ')
            if root.right:
                print(root.right.value, end='')
            else:
                print('None', end='')
            print('  (bf:', self.get_balance_factor(root), end=')\n')
            _print_tree(root.left)
            _print_tree(root.right)

        print('输出平衡二叉树： 各节点因子为：')
        _print_tree(self.root)

注意，这里修改的只是`print_tree()`函数中的输出语句，其他代码保持不变。