如何在python anytree graphviz输出中反转箭头的方向？

pip install anytree
pip install graphviz

from anytree import Node, RenderTree
from graphviz import Digraph

# 创建节点
root = Node("Root")
node1 = Node("Node 1", parent=root)
node2 = Node("Node 2", parent=root)

# 反转节点的父子关系
node2.parent = node1

# 输出树结构
for pre, fill, node in RenderTree(root):
    print("%s%s" % (pre, node.name))

# 生成graphviz图形并反转箭头方向
dot = Digraph()
for node in PreOrderIter(root):
    dot.node(node.name)
    if node.parent:
        dot.edge(node.name, node.parent.name, arrowhead='inv')
dot.view()