app.py

import gradio as gr

def greet(inp, messages):
    messages.append(inp)
    print(messages)
    return "Hello " + inp + "!"
    
def clear_memory(messages):
    messages.clear()
    return "Memory cleaned."
    
with gr.Blocks(theme=gr.themes.Default(primary_hue=gr.themes.colors.orange, secondary_hue=gr.themes.colors.pink)) as demo:
    stored_message = gr.State([])
    with gr.Row():
        with gr.Column(scale=2):
            text1 = gr.Textbox(lines=7, label="Prompt", scale=2)
            with gr.Row():
                btn1 = gr.Button("Submit", scale=1)
                btn2 = gr.Button("Clear",  scale=1)
                btn3 = gr.Button("Clean Memory",  scale=2)
        with gr.Column(scale=2):
            out_text = gr.Text(lines=15, label="Output", scale=2)
    btn1.click(fn=greet, inputs=[text1, stored_message], outputs=out_text)
    btn2.click(lambda: [None, None], outputs=[text1, out_text])
    btn3.click(fn=clear_memory, inputs=[stored_message], outputs=[out_text])
demo.launch()