函数调用（Function Calling）

export API_KEY="YOUR_API_KEY"

import os
import json
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["API_KEY"],
    base_url="https://api.siflow.cn/model-api",
)

tools = [
    {
        "type": "function",
        "function": {
            "name": "get_weather",
            "description": "Get the current weather for a city",
            "parameters": {
                "type": "object",
                "properties": {
                    "city": {
                        "type": "string",
                        "description": "City name",
                    }
                },
                "required": ["city"],
            },
        },
    }
]


def get_weather(city: str) -> dict:
    # Replace with a real API call.
    return {"city": city, "temp_c": 21, "condition": "Sunny"}


messages = [
    {"role": "user", "content": "What's the weather like in Paris today?"}
]

# 1. First call: the model decides whether to use the tool.
resp = client.chat.completions.create(
    model="Qwen/Qwen3.6-27B",
    messages=messages,
    tools=tools,
    tool_choice="auto",
    max_completion_tokens=1024,
)

msg = resp.choices[0].message

if msg.tool_calls:
    messages.append(msg)

    for call in msg.tool_calls:
        args = json.loads(call.function.arguments)
        result = get_weather(**args)

        # 2. Return the tool result, linked by tool_call_id.
        messages.append(
            {
                "role": "tool",
                "tool_call_id": call.id,
                "content": json.dumps(result),
            }
        )

    # 3. Second call: the model writes the final answer.
    final = client.chat.completions.create(
        model="Qwen/Qwen3.6-27B",
        messages=messages,
        max_completion_tokens=1024,
    )

    print(final.choices[0].message.content)
else:
    print(msg.content)