import urllib.request, json

def lambda_handler(_event, _context):
    with urllib.request.urlopen("https://daringfireball.net/feeds/json") as url:
        data = json.loads(url.read().decode())
        keys = ["id", "url", "title", "date_published"]
        items = data["items"]

        new_items = []

        for item in items:
            new_item = { key: item[key] for key in keys }
            new_items.append(new_item)

    feed = {
            "version" : "https://jsonfeed.org/version/1",
            "title" : "Daring Fireball",
            "items" : new_items
            }
    return json.dumps(feed)

print(lambda_handler([], 0))