#AST资料
https://docs.python.org/3/library/ast.html
https://blog.youkuaiyun.com/ma89481508/article/details/56017697
https://greentreesnakes.readthedocs.io/en/latest/examples.html
http://www.dalkescientific.com/writings/diary/archive/2010/02/22/instrumenting_the_ast.html