Python: A Complete JSON-Line Strategy

Understand the idea

Install Python 3, save the program below as your-bot.py, and download the existing galaxy-adapter.py. The adapter keeps the strategy process running and sends one JSON observation per line. Python's json library parses the observation, while sys.stdin supplies the lines.

The choose function uses the authoritative legal flags. It checks for free, calls small amounts, then folds. Every reply is one JSON object flushed immediately. Error messages go to stderr. This is intentionally cautious and does not evaluate hand strength.

import json
import sys

CALL_CAP = 20

def choose(observation):
    legal = observation.get('legal') or {}
    if legal.get('check'):
        return {'kind': 'check'}
    if legal.get('call') and legal.get('callAmount', 0) <= CALL_CAP:
        return {'kind': 'call'}
    if legal.get('fold'):
        return {'kind': 'fold'}
    raise ValueError('No supported legal action')

for line in sys.stdin:
    try:
        observation = json.loads(line)
        answer = choose(observation)
    except (ValueError, TypeError) as error:
        print(f'Observation error: {error}', file=sys.stderr)
        answer = {'kind': 'fold'}
    print(json.dumps(answer, separators=(',', ':')), flush=True)