Python 通过JSON进行迭代需要比I'；I’我想要

我正在读取一个.json文件并解析一些数据以保存到一个对象中。JSON中只有2000个左右的项目需要迭代，但我当前运行的脚本比我希望的要长得多

data_file = 'v1/data/data.json'
user = User.objects.get(username='lsv')
format = Format(format='Limited')
format.save()
lost_cards = []
lost_cards_file = 'v1/data/LostCards.txt'

with open(data_file) as file:
    data = json.load(file)

for item in data:
    if item['model'] == 'cards.cardmodel':
        if len(Card.objects.filter(name=item['fields']['name'])) == 0:
            print(f"card not found: {item['fields']['name']}")
            lost_cards.append(item['fields']['name'])
        try:
            Rating(
                card=Card.objects.get(name=item['fields']['name'], set__code=item['fields']['set']),
                rating=item['fields']['rating'],
                reason=item['fields']['reason'],
                format=format,
                rator=user
            ).save()
        except Exception as e:
            print(e, item['fields']['name'], item['fields']['set'])
            break

with open(lost_cards_file, 'w') as file:
    file.write(str(lost_cards))

代码按预期工作，但所花的时间比我希望的要长得多。我希望有一个内置的JSON或迭代器函数可以加速这个过程。

有。它被称为模块

打开（数据文件，'r'）作为输入文件：
字典\u from\u json=json.load（输入\u文件）

我应该这样做