{
 "cells": [
  {
   "metadata": {},
   "cell_type": "raw",
   "source": "1.开始",
   "id": "e69a816f955ad467"
  },
  {
   "metadata": {
    "ExecuteTime": {
     "end_time": "2025-09-30T01:42:53.631350Z",
     "start_time": "2025-09-30T01:42:53.622345Z"
    }
   },
   "cell_type": "code",
   "source": [
    "import os\n",
    "from dotenv import load_dotenv  # 强制依赖 python-dotenv\n",
    "\n",
    "# 加载 .env 文件中的配置（如果文件不存在或加载失败会报错）\n",
    "load_dotenv(override=True)  # override=True 确保覆盖系统中已有的同名环境变量\n",
    "\n",
    "# 从 .env 文件中读取配置，若不存在则直接抛出异常\n",
    "required_vars = [\n",
    "    \"LANGSMITH_TRACING\",\n",
    "    \"LANGSMITH_API_KEY\",\n",
    "    \"LANGSMITH_PROJECT\"\n",
    "]\n",
    "\n",
    "# 检查必要的配置项是否存在\n",
    "missing_vars = [var for var in required_vars if var not in os.environ]\n",
    "if missing_vars:\n",
    "    raise ValueError(\n",
    "        f\".env 文件中缺少必要的配置项：{', '.join(missing_vars)}\\n\"\n",
    "        \"请确保 .env 文件中包含以下配置：\\n\"\n",
    "        \"LANGSMITH_TRACING=true\\n\"\n",
    "        \"LANGSMITH_API_KEY=你的API密钥\\n\"\n",
    "        \"LANGSMITH_PROJECT=你的项目名（默认可填default）\"\n",
    "    )\n",
    "print(\"配置检查通过\")\n",
    "# 输出\n",
    "print(f\"LANGSMITH_TRACING: {os.environ['LANGSMITH_TRACING']}\")\n",
    "\n",
    "# 验证 LANGSMITH_TRACING 必须为 true（保持原逻辑的强制开启）\n",
    "if os.environ[\"LANGSMITH_TRACING\"].lower() != \"true\":\n",
    "    raise ValueError(\"LANGSMITH_TRACING 必须设置为 true（区分大小写，建议直接填写true）\")"
   ],
   "id": "f55903969ee7b754",
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "配置检查通过\n",
      "LANGSMITH_TRACING: true\n"
     ]
    }
   ],
   "execution_count": 6
  },
  {
   "metadata": {},
   "cell_type": "markdown",
   "source": "2.三四十",
   "id": "42e3303c7c697d34"
  },
  {
   "metadata": {},
   "cell_type": "code",
   "outputs": [],
   "execution_count": null,
   "source": [
    "import getpass\n",
    "import os\n",
    "\n",
    "if not os.environ.get(\"OPENAI_API_KEY\"):\n",
    "  os.environ[\"OPENAI_API_KEY\"] = getpass.getpass(\"Enter API key for OpenAI: \")\n",
    "\n",
    "from langchain.chat_models import init_chat_model\n",
    "\n",
    "model = init_chat_model(\"gpt-4o-mini\", model_provider=\"openai\")"
   ],
   "id": "d9c653b7f628c02f"
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
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  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 2
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython2",
   "version": "2.7.6"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 5
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