这里函数返回的仍是包含明文密码的 UserIn ，但 response_model=UserOut 声明了对外模型不含 password 字段， FastAPI 会借助 Pydantic 自动过滤掉所有未在输出模型中声明的数据 ，从而避免把用户密码泄露给每个客户端。 这也是清单中「数据过滤 - 安全」一条推荐的做法。

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