update

2025.11.02_langchain/langchain_example_with_tool_version_2.py

@@ -0,0 +1,54 @@
+"""
+This code is supported by the website: https://www.guanjihuan.com
+The newest version of this code is on the web page: https://www.guanjihuan.com/archives/47909
+"""
+
+import os
+import dotenv
+from langchain_openai import ChatOpenAI
+from langchain_core.tools import tool
+from langchain.agents import create_agent
+from langchain_core.globals import set_debug # ✅ 用于开启详细日志
+
+# 开启调试日志输出
+set_debug(True)
+
+# 加载环境变量
+dotenv.load_dotenv()
+
+# 定义工具
+@tool
+def get_current_time() -> str:
+    """获取当前日期和时间"""
+    from datetime import datetime
+    return datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+
+@tool
+def add_numbers(a: float, b: float) -> float:
+    """将两个数字相加"""
+    return a + b
+
+tools = [get_current_time, add_numbers]
+
+# 创建 LLM
+llm = ChatOpenAI(
+    api_key=os.getenv("OPENAI_API_KEY"),
+    base_url=os.getenv("DASHSCOPE_BASE_URL"),
+    model="qwen-plus",
+    temperature=0.7,
+)
+
+# 创建 agent
+agent = create_agent(llm, tools)
+
+# 执行调用（此时会打印详细步骤）
+response = agent.invoke(
+    {
+        "messages": [
+            {"role": "user", "content": "现在几点了？然后把 123 和 456 加起来。"}
+        ]
+    }
+)
+
+print("\n---\n")
+print(response["messages"][-1].content)