app.py

#https://python.langchain.com/docs/how_to/configure/
import gradio as gr
from langchain_openai import ChatOpenAI
from langchain_core.prompts import PromptTemplate
from langchain_core.runnables import ConfigurableField

def process_with_config(topic, temperature, mode, api_key):
    try:
        # Initialize configurable model
        model = ChatOpenAI(temperature=0).configurable_fields(
            temperature=ConfigurableField(
                id="llm_temperature",
                name="LLM Temperature",
                description="Temperature for response generation"
            )
        )
        
        # Create configurable prompt
        prompt = PromptTemplate.from_template(
            "Tell me a {mode} about {topic}"
        ).configurable_alternatives(
            ConfigurableField(id="prompt"),
            default_key="joke",
            poem=PromptTemplate.from_template("Write a poem about {topic}")
        )
        
        # Create chain
        chain = prompt | model
        
        # Configure and run
        response = chain.with_config(
            configurable={
                "llm_temperature": float(temperature),
                "prompt": mode
            }
        ).invoke({"topic": topic})
        
        return response.content
        
    except Exception as e:
        return f"Error: {str(e)}"

# Create Gradio interface
demo = gr.Interface(
    fn=process_with_config,
    inputs=[
        gr.Textbox(label="Topic", placeholder="Enter a topic..."),
        gr.Slider(0, 1, value=0.5, label="Temperature"),
        gr.Radio(["joke", "poem"], label="Mode", value="joke"),
        gr.Textbox(label="OpenAI API Key", type="password")
    ],
    outputs=gr.Textbox(label="Generated Response"),
    title="LangChain Configuration Demo",
    description="Generate content with configurable temperature and mode"
)

if __name__ == "__main__":
    demo.launch()