Update app.py

app.py

@@ -7,6 +7,11 @@ from pixeltable.functions.huggingface import sentence_transformer
 from pixeltable.functions import openai
 import os
 
+"""## Store OpenAI API Key"""
+
+if 'OPENAI_API_KEY' not in os.environ:
+    os.environ['OPENAI_API_KEY'] = getpass.getpass('Enter your OpenAI API key:')
+
 # Ensure a clean slate for the demo
 pxt.drop_dir('rag_demo', force=True)
 pxt.create_dir('rag_demo')