Update app.py

app.py

@@ -21,7 +21,6 @@ from langchain.chat_models import ChatOpenAI
 from langchain.memory import ConversationBufferWindowMemory
 from langchain.chains import ConversationalRetrievalChain
 from langchain.callbacks import get_openai_callback
-from key import openai_api_key
 from langchain import PromptTemplate
 from langchain import LLMChain
 os.environ['OPENAI_API_KEY'] = openai_api_key