Update app.py

app.py

@@ -5,6 +5,7 @@ import os.path
 from llama_index.core import VectorStoreIndex, SimpleDirectoryReader, load_index_from_storage, ServiceContext, StorageContext
 from llama_index.readers.file import PDFReader
 from llama_index.llms.openai import OpenAI
+from dotenv import load_dotenv
 
 
 
@@ -12,7 +13,7 @@ from llama_index.core.tools import QueryEngineTool, ToolMetadata
 from llama_index.agent.openai import OpenAIAgent
 
 
-os.environ['OPENAI_API_KEY']= os.environ['open_ai']
+load_dotenv()
 storage_path = "./vectorstore"
 documents_path = "./documents"