langchain创建agent使用阿里云百炼API，的示例

from langchain_community.tools import TavilySearchResults
from langchain_core.tools import tool
from langchain_openai import ChatOpenAI
import os
from langchain.agents import AgentExecutor, create_tool_calling_agent
from langchain_core.prompts import ChatPromptTemplate

model = ChatOpenAI(model="qwen-max",api_key=os.getenv("OPENAI_API_KEY"),
                   base_url="https://dashscope.aliyuncs.com/compatible-mode/v1",
                   temperature=0.7,
                   max_tokens=1024)


@tool
def magic_function(input: int) -> int:
    """Applies a magic function to an input."""
    print("工具调用================")
    return input + 2


tools = [magic_function]

prompt = ChatPromptTemplate.from_messages(
    [
        ("system", "You are a helpful assistant"),
        ("human", "{input}"),
        # Placeholders fill up a **list** of messages
        ("placeholder", "{agent_scratchpad}"),
    ]
)

# 创建Agent 和 AgentExecutor
agent = create_tool_calling_agent(model, tools, prompt)
agent_executor = AgentExecutor(agent=agent, tools=tools,verbose=True)

print(agent_executor.invoke({"input": "what is the value of magic_function(3)?"}))