优化代码，提高解耦

05_langchain_advanced/04_memory_general_agent.py

@@ -1,13 +1,7 @@
-import os
-from dotenv import load_dotenv
-
-load_dotenv()
-api_key = os.getenv("OPENAI_API_KEY")
-
-
-import os
+from config import OPENAI_API_KEY
 from langchain_openai import ChatOpenAI
-from langchain.agents import AgentExecutor, create_tool_calling_agent
+from langchain_classic.agents import AgentExecutor
+from langchain_classic.agents import create_tool_calling_agent
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain_core.tools import tool # 导入 @tool
 from langchain_community.chat_message_histories import ChatMessageHistory
@@ -17,7 +11,7 @@ from langchain_core.runnables import RunnableWithMessageHistory
 # 配置llm
 llm = ChatOpenAI(
     model="deepseek-chat",
-    api_key=api_key,
+    api_key=OPENAI_API_KEY,
     base_url="https://api.deepseek.com"
 )
 # 配置prompt(新增俩占位符 一个为对话历史记录，一个为agent的思考过程)