如何使用python列表填充Dash中的下拉列表，并在变量中获取它的值？

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output

app = dash.Dash(__name__)

options = [
    {'label': '选项1', 'value': 'value1'},
    {'label': '选项2', 'value': 'value2'},
    {'label': '选项3', 'value': 'value3'}
]

app.layout = html.Div([
    dcc.Dropdown(
        id='dropdown',
        options=options,
        value=options[0]['value']
    ),
    html.Div(id='output')
])

@app.callback(
    Output('output', 'children'),
    [Input('dropdown', 'value')]
)
def update_output(value):
    return f'你选择了：{value}'

if __name__ == '__main__':
    app.run_server(debug=True)