Alternative implementation

[ingydotnet]

Nice job!

Here's an alternative that should be easily doable with pyyaml.

- !repeat
  - 3
  - - !say Please guess a number
    - !read number
    - !if
      - [ ==, !get number, 777 ]
      - - !say That was correct!
        - !break
      - !say Try again!

I'll leave the runner as an exercise.

Full disclosure, I am a creator of the YAML language and current maintainer of pyyaml. :)

Check out https://play.yaml.io/main/parser?input=LSAhcmVwZWF0CiAgLSAzCiAgLSAtICFzYXkgUGxlYXNlIGd1ZXNzIGEgbnVtYmVyCiAgICAtICFyZWFkIG51bWJlcgogICAgLSAhaWYKICAgICAgLSBbID09LCAhZ2V0IG51bWJlciwgNzc3IF0KICAgICAgLSAtICFzYXkgVGhhdCB3YXMgY29ycmVjdCEKICAgICAgICAtICFicmVhawogICAgICAtICFzYXkgVHJ5IGFnYWluIQo=

Also feel free to stop by https://matrix.to/#/#chat:yaml.io and say Hi sometime.

[ingydotnet]

I probably should have written [ ==, !get number, 777 ] as !== [ !get number, 777 ].

[ingydotnet]

Let me know if you figure out the Python, else I'll write it here tomorrow.

[ingydotnet]

Here's my fully working version (in one file):

https://github.com/ingydotnet/yaml-lisp-python/blob/master/numbergame.py#L11-L37

I used a pyyaml's multiconstructor for handling the tags. That makes the YAML get loaded as:

[('repeat', [3, [('say', 'Please guess a number'), ('read', 'number'), ('if_', [('eq', [('get', 'number'), 777]), [('say', 'That was correct!'), ('break_', '')], ('say', 'Try again!')])]])]

Which makes it lispy again :)