Python Plotly Dash下拉菜单为散点图添加"select all“

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

app = dash.Dash(__name__)

data = px.data.iris()
fig = px.scatter(data_frame=data, x="sepal_width", y="sepal_length", color="species")
layout = html.Div([
    dcc.Graph(id="scatter-plot", figure=fig),
    dcc.Dropdown(
        id="dropdown",
        options=[
            {"label": "Select All", "value": "all"},
            {"label": "Setosa", "value": "setosa"},
            {"label": "Versicolor", "value": "versicolor"},
            {"label": "Virginica", "value": "virginica"}
        ],
        value="all",
        multi=True
    )
])

@app.callback(
    Output("scatter-plot", "figure"),
    [Input("dropdown", "value")]
)
def update_scatter_plot(selected_values):
    if "all" in selected_values:
        filtered_data = data
    else:
        filtered_data = data[data["species"].isin(selected_values)]
    
    fig = px.scatter(data_frame=filtered_data, x="sepal_width", y="sepal_length", color="species")
    return fig

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