app_chat_st.py

import openai
import streamlit as st

user_avatar = 'assets/user.png'
assistant_avatar = 'assets/bot.png'

st.title("AI Chat")

openai.api_key = st.secrets["OPENAI_API_KEY"]

if "openai_model" not in st.session_state:
    st.session_state["openai_model"] = "gpt-3.5-turbo"

if "messages" not in st.session_state:
    st.session_state.messages = []

for message in st.session_state.messages:
    with st.chat_message(message["role"], avatar=user_avatar if message["role"] == "user" else assistant_avatar):
        st.markdown(message["content"])

if prompt := st.chat_input("What is up?"):
    with st.chat_message("user", avatar=user_avatar):
        st.markdown(prompt)
    st.session_state.messages.append({"role": "user", "content": prompt})

    with st.chat_message("assistant", avatar=assistant_avatar):
        message_placeholder = st.empty()
        full_response = ""
        try:
            for response in openai.ChatCompletion.create(
                model=st.session_state["openai_model"],
                messages=[
                    {"role": m["role"], "content": m["content"]}
                    for m in st.session_state.messages
                ],
                stream=True,
            ):
                full_response += response.choices[0].delta.get("content", "")
                message_placeholder.markdown(full_response + "▌")
        except:
            pass
        message_placeholder.markdown(full_response)
    st.session_state.messages.append({"role": "assistant", "content": full_response})