Graphvizで描いたノードに画像を貼り付ける(Pythonで)

from graphviz import Digraph
# Ready to parent graph.
g = Digraph(comment = 'Graph')
g.node('A', 'King Arthur', image="king.png")
g.node('B', 'Sir Bedevere the Wise')
g.node('L', 'Sir Lancelot the Brave')
g.edges(['AB', 'AL'])
g.edge('B', 'L', constraint='false')
g.view()