A demo Dash app demonstrating how to run uv scripts remotely

app.py

# /// script
# requires-python = ">=3.12"
# dependencies = [
#     "dash",
#     "dash-bootstrap-components",
# ]
# ///

from dash import Dash, html, dcc, Output, Input
import dash_bootstrap_components as dbc

app = Dash(external_stylesheets=[dbc.themes.COSMO])

app.layout = html.Div([
    html.Br(),
    html.H1("Dash app hosted online!"),
    html.H2("Choose a color:"),
    dcc.Dropdown(id="dropdown", options=["Green", "Blue", "Yellow", "Red"]),
    html.Br(),
    html.Div(id="output"),
    ], style={"marginLeft": "5%", "marginRight": "5%"})


@app.callback(Output("output", "children"), Input("dropdown", "value"))
def display_chosen(color):
    if not color:
        return "You chose nothing yet..."
    return html.Span([f"You chose the color: ", html.Span(f"{color}", style={"color": color})], style={"fontSize": "24pt"})

if __name__ == "__main__":
    app.run()

Here is a quick tutorial on how to run Python scripts with uv if you're interested.