app.py

import streamlit as st
import openai
from langchain_openai import ChatOpenAI
from langchain_core.output_parsers import StrOutputParser
from langchain_core.prompts import ChatPromptTemplate


import os
from dotenv import load_dotenv


load_dotenv()


## Langsmith Tracking
os.environ['LANGCHAIN_API_KEY'] = os.getenv('LANGCHAIN_API_KEY')
os.environ['LANGCHAIN_TRACING_V2'] = 'true'
os.environ['LANGCHAIN_PROJECT'] = "Simple Q&A Chatbot With OpenAI"

## Prompt Template
prompt = ChatPromptTemplate(
    [
        ("system", "You are a helpful assistant. Please answer the user's questions to the best of your ability."),
        ("user", "Question:{question}"),
    ]
)


def generate_response(question, api_key, llm, temperature, max_tokens):
    openai.api_key = api_key
    llm = ChatOpenAI(model=llm,temperature=temperature,max_tokens=max_tokens)
    output_parser = StrOutputParser()
    chain = prompt|llm|output_parser
    answer = chain.invoke({'question':question})
    return answer


## Title of the chat
st.title('Enhanced Q&A Chatbot With OpenAI')

## Sidebar for settings
st.sidebar.title('Settings')
api_key = st.sidebar.text_input("Enter your Open AI API Key:", type="password")

## Dropdown to select various OpenAI models
llm = st.sidebar.selectbox('Select OpenAI Model', ['gpt-4o-mini', 'gpt-4-turbo', 'gpt-4o'])

## Adjust response parameters
temperature = st.sidebar.slider('Temperature', min_value=0.0, max_value=1.0, value=0.7)
max_tokens = st.sidebar.slider('Max Tokens', min_value=50, max_value=3000, value=150)

## Main Interface for user input
st.write('Ask me anything!')
user_input = st.text_input('Enter your question here:')

if user_input:
    response = generate_response(user_input, api_key, llm, temperature, max_tokens)
    st.write(response)
else:
    st.write('Please enter a question to get started!')