Update app.py

app.py

@@ -12,8 +12,9 @@ from IPython import get_ipython
 
 GPT_MODEL = "gpt-3.5-turbo-1106"
 
-from google.colab import userdata
-openai.api_key = userdata.get('OPENAI_API_KEY')
+openai.api_key  = os.environ['OPENAI_API_KEY']
+
+messages=[]
 
 def exec_python(cell):
     # result = 0