From 2260306c87f4e8c064a16158d483cbb5b556350c Mon Sep 17 00:00:00 2001
From: guanjihuan <guanjihuan@163.com>
Date: Sun, 2 Nov 2025 04:14:55 +0800
Subject: [PATCH] update

---
 .../.env                                      |  0
 .../langchain_example.py                      |  0
 .../langchain_example_with_memory.py          |  0
 .../langchain_example_with_tool.py            | 57 +++++++++++++++++++
 4 files changed, 57 insertions(+)
 rename {2025.11.03_langchain => 2025.11.02_langchain}/.env (100%)
 rename {2025.11.03_langchain => 2025.11.02_langchain}/langchain_example.py (100%)
 rename {2025.11.03_langchain => 2025.11.02_langchain}/langchain_example_with_memory.py (100%)
 create mode 100644 2025.11.02_langchain/langchain_example_with_tool.py

diff --git a/2025.11.03_langchain/.env b/2025.11.02_langchain/.env
similarity index 100%
rename from 2025.11.03_langchain/.env
rename to 2025.11.02_langchain/.env
diff --git a/2025.11.03_langchain/langchain_example.py b/2025.11.02_langchain/langchain_example.py
similarity index 100%
rename from 2025.11.03_langchain/langchain_example.py
rename to 2025.11.02_langchain/langchain_example.py
diff --git a/2025.11.03_langchain/langchain_example_with_memory.py b/2025.11.02_langchain/langchain_example_with_memory.py
similarity index 100%
rename from 2025.11.03_langchain/langchain_example_with_memory.py
rename to 2025.11.02_langchain/langchain_example_with_memory.py
diff --git a/2025.11.02_langchain/langchain_example_with_tool.py b/2025.11.02_langchain/langchain_example_with_tool.py
new file mode 100644
index 0000000..3c7561f
--- /dev/null
+++ b/2025.11.02_langchain/langchain_example_with_tool.py
@@ -0,0 +1,57 @@
+import os
+import dotenv
+from langchain_openai import ChatOpenAI
+from langchain_core.prompts import ChatPromptTemplate
+from langchain_core.tools import tool
+from langchain.agents import create_openai_tools_agent, AgentExecutor
+
+# 加载环境变量
+dotenv.load_dotenv()
+
+# 定义工具（Tool）
+@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
+
+# 注意：你可以添加更多工具，比如天气查询、网络搜索等
+
+tools = [get_current_time, add_numbers]
+
+# 创建 LLM（必须支持 function calling）
+llm = ChatOpenAI(
+    api_key=os.getenv("OPENAI_API_KEY"),
+    base_url=os.getenv("DASHSCOPE_BASE_URL"),
+    model="qwen-plus",
+    temperature=0.7,
+    streaming=True,
+)
+
+# 构建提示模板（LangChain 会自动注入工具信息）
+prompt = ChatPromptTemplate.from_messages([
+    ("system", "你是一个智能助手，可以使用工具来回答问题。"),
+    ("human", "{input_message}"),
+    ("placeholder", "{agent_scratchpad}"),  # 必须包含这个占位符
+])
+
+# 创建 OpenAI 工具型智能体（兼容 function calling）
+agent = create_openai_tools_agent(llm, tools, prompt)
+
+# 创建执行器
+agent_executor = AgentExecutor(
+    agent=agent,
+    tools=tools,
+    verbose=True,  # 打印中间步骤（可选）
+    handle_parsing_errors=True,
+)
+
+# 非流式调用（AgentExecutor 目前对流式支持有限，尤其在工具调用场景）
+response = agent_executor.invoke({"input_message": "现在几点了？然后把 123 和 456 加起来。"})
+print('\n---\n')
+print(response["output"])
\ No newline at end of file