[Python] What am I doing wrong with gradio.Dropdown? How to dynamically modify the choices of...

I want to create a gradio webui that shows 2 dropdown, rs_hw changes dynamically according to the rs value. What am I doing wrong here?

import gradio as gr

languages = ['spanish', 'english']
homeworks = {'spanish': ['hola', 'bien', 'gracias'], 'english': ['hello', 'good', 'thank you']}

def rs_change(rs):
return homeworks[rs]

with gr.Blocks() as app:

rs = gr.Dropdown(choices=languages)
rs_hw = gr.Dropdown()

rs.change(fn=rs_change, inputs=[rs], outputs=[rs_hw])

app.launch()


rs_hw keeps always empty

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