remove not single syllable

os_env.ipynb

@@ -0,0 +1,108 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "ab869d03-ed90-4c48-affe-02eb74938022",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "/home/changcl/apps/jupyter/notebook\n"
+     ]
+    }
+   ],
+   "source": [
+    "import os\n",
+    "print(os.getcwd())"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "10f377d9-24ec-4d64-8dd5-2cfbe14a0245",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# /home/changcl/apps/jupyter\n",
+    "# uv add python-dotenv\n",
+    "from dotenv import load_dotenv"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "149cbe5b-8365-47c1-a88b-9726865ef16a",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "load_dotenv()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "id": "64fe12a2-a517-4336-adfc-4965531b19d9",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "database_url = os.getenv(\"DATABASE_URL\")\n",
+    "api_key = os.getenv(\"API_KEY\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "id": "9fb9cbb7-e13e-44f9-84c7-9124a1274ede",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Database URL: postgresql://user:password@host:port/database\n",
+      "API Key: your_secret_api_key\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(f\"Database URL: {database_url}\")\n",
+    "print(f\"API Key: {api_key}\")"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.12.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}