René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"How do you walk the AST with the use of `ctx`?","articleBody":"I think that in order to use this library, I need to do something like:\r\n\r\n```\r\nimport { walk, parse, createVisitor } from 'python-ast';\r\n\r\nlet ast = parse(`\r\nprint(\"hello world!)\r\n`);\r\n\r\nlet listener = createVisitor(ast);\r\n\r\nwalk(ast, listener);\r\n```\r\n\r\nbut I got this error:\r\n\r\n```\r\nno viable alternative at input '!'\r\nctx.enterRule(listener);\r\n            ^\r\nTypeError: Cannot read property 'enterRule' of undefined\r\n```\r\nThis library is quite opaque to me. I've been unable to use antlr4 directly (by installing antlr4 using npm). I'm not sure why I'm getting this error.","author":{"url":"https://github.com/genderev","@type":"Person","name":"genderev"},"datePublished":"2021-11-29T21:46:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/2/python-ast/issues/2"}