下载安装Graphviz : [https://graphviz.org/download/](https://graphviz.org/download/)
conda安装 pygraphviz
conda install -c alubbock pygraphviz
执行命令dot -v 如果出现 Perhaps "dot -c" needs to be run则执行 dot -c
安装objgraph
pip install objgraph
生成引用图
a = [1,2,3]
objgraph.show_refs([a], filename="sample-graph.png")