app.py

import streamlit as st

from langchain.chat_models import ChatOpenAI
from langchain.schema import (AIMessage, HumanMessage, SystemMessage)

st.set_page_config(page_title='Chat Model', page_icon=":robot:")
st.header("Hey, I'm your Chat GPT")

if 'sessionMessages' not in st.session_state:
    st.session_state.sessionMessages = [
        SystemMessage(content="You are a helpful assistant.") #Telling the model
    ]

def load_answer(question):
    st.session_state.sessionMessages.append(HumanMessage(content=question))
    assistant_answer = chat(st.session_state.sessionMessages)
    st.session_state.sessionMessages.append(AIMessage(content=assistant_answer.content))
    return assistant_answer.content

def get_text():
    input_text = st.text_input("You: ", key=input)
    return input_text
chat = ChatOpenAI(temperature=0)

user_input = get_text()
submit = st.button('Generate')

if submit:
    response = load_answer(user_input)
    st.subheader("Answer:")
    st,write(response, key=1)