使用 Stream 流式输出

## 1 创建OpenAI客户端

```python
client = OpenAI(
    api_key=os.getenv("OPENAI_API_KEY"),
    base_url="https://api.siliconflow.cn/v1",
)
```

## 2  开启流式传输

```python
stream = client.chat.completions.create(
    model="Qwen/Qwen2.5-7B-Instruct",
    messages=[
        {"role": "system", "content": "你是一个优秀的助手。"},
        {"role": "user", "content": "你好，我叫李雷，1+1等于多少？"}
    ],
    temperature=0.3,
    stream=True,
)
```

在创建对话时，我们添加了一个属性：

```python
stream=True
```

这个属性表示开启流式传输。

## 3 循环访问块

```python
# 当启用流式输出模式（stream=True），SDK 返回的内容也发生了变化，我们不再直接访问返回值中的 choice
# 而是通过 for 循环逐个访问返回值中每个单独的块（chunk）

for chunk in stream:
    # 在这里，每个 chunk 的结构都与之前的 completion 相似，但 message 字段被替换成了 delta 字段
    delta = chunk.choices[0].delta  # <-- message 字段被替换成了 delta 字段

if delta.content:
        # 我们在打印内容时，由于是流式输出，为了保证句子的连贯性，我们不人为地添加
        # 换行符，因此通过设置 end="" 来取消 print 自带的换行符。
        print(delta.content, end="")
```

结果如下：

```
地球的自转周期是24小时，也就是我们通常所说的一天。这是地球完成一次自转所需的时间。
```

结果的内容不重要，重要的是结果的显示方式，它不是一次性将所有内容显示出来，而是一个字或多个字蹦出来。这就是流式输出。

### 4 使用Apifox访问

代码如下：

```json
{
    "model": "Qwen/Qwen2.5-7B-Instruct",
    "messages": [
        {
            "role": "system",
            "content": "你是一个优秀的助手"
        },
        {
            "role": "user",
            "content": "地球的自转周期是多少？"
        }
    ],
    "stream": true
}
```

结果如下：

```json
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data: [DONE]

```

从结果可以看出，返回的结果分成一份一份的返回给客户端。

使用 Stream 流式输出