Blame for Demo Basic Streaming.py

import gradio as gr
import random
import time

with gr.Blocks() as demo:
    chatbot = gr.Chatbot()
    msg = gr.Textbox()

    def user(user_message, history):
        return "", history + [[user_message, None]]

    def bot(history):
        bot_message = "The Moon, Earth s only natural satellite and the fifth largest moon in our Solar System, is a celestial body that orbits our planet approximately every 27.3 days."
        history[-1][1] = ""
        for character in bot_message:
            history[-1][1] += character
            time.sleep(0.05)
            yield history

    msg.submit(user, [msg, chatbot], [msg, chatbot], queue=False).then(
        bot, chatbot, chatbot
    )
    
demo.queue()
demo.launch()