Code Checks for Format and Rules

import json

TRADES = {"plumbing", "electrical", "heating_and_cooling", "appliance", "carpentry", "other"}

def check_trade(raw_output):
    try:
        ticket = json.loads(raw_output)
    except json.JSONDecodeError:
        return "fail", "not valid JSON"
    if ticket.get("trade") not in TRADES:
        return "fail", f"trade {ticket.get('trade')!r} is not an allowed value"
    return "pass", ""

These few lines grade one output of the job ticket assistant for two problems: text that is not valid JSON, and a trade outside the six the business uses