moth/example-puzzles/example/3/mkpuzzle

#! /usr/bin/python3

import argparse
import json
import os
import random
import shutil
import sys

random.seed(os.getenv("SEED", ""))

words = ["apple", "pear", "peach", "tangerine", "orange", "potato", "carrot", "pea"]
answer = ' '.join(random.sample(words, 4))

def puzzle():
    number = random.randint(20, 500)
    obj = {
        "Pre": {
            "Authors": ["neale"],
            "Body": (
                "<p>Dynamic puzzles are provided with a JSON-generating <code>mkpuzzles</code> program in the puzzle directory.</p>"
                "<p>You can write <code>mkpuzzles</code> in any language you like. This puzzle was written in Python 3.</p>"
                "<p>Here is some salad:<img src='salad.jpg'></p>"
            ),
            "Attachments": ["salad.jpg"],
        },
        "Answers": [
            answer,
        ],
        "Debug": {
            "Summary": "Dynamic puzzles",
            "Hints": [
                "Check the debug output to get the answer." ,
            ],
            "Errors": [],
            "Log": [
                "%d is a positive integer" % number,
            ],
        }
    }
    json.dump(obj, sys.stdout)

def open_file(filename):
    f = open(filename, "rb")
    shutil.copyfileobj(f, sys.stdout.buffer)

def check_answer(check):
    if answer == check:
        print("correct")
    else:
        print("incorrect")

if len(sys.argv) == 1:
    puzzle()
elif sys.argv[1] == "file":
    open_file(sys.argv[2])
elif sys.argv[1] == "answer":
    check_answer(sys.argv[2])
else:
    raise RuntimeError("Unknown command: %s" % sys.argv[1])