最近需要用到Gradio的dropdown的控件，但是里面的默认值需要随着一些操作而改变，网上查了好久才有答案，这里给出一个示例，让大家少走弯路哈。

import gradio as gr


def Dropdown_list(x):
    new_options =  [*options, x + " Remastered", x + ": The Remake", x + ": Game of the Year Edition", x + " Steelbook Edition"]
    return gr.Dropdown.update(choices=new_options)

demo = gr.Blocks()

options = ['Placeholder A', 'Placeholder B', 'Placeholder C']
with demo:

    text_options = gr.Dropdown(options, label="Top 5 options")
    b2 = gr.Button("Provide Additional options")
    b2.click(Dropdown_list, inputs=text_input, outputs=text_options)

参考文献

How to update the gr.Dropdown() block in Gradio Blocks