app.py

import dash
from dash import html, dcc
import pandas as pd # Example import
# ... any other imports

app = dash.Dash(__name__, external_stylesheets=['https://codepen.io/chriddyp/pen/bWLwgP.css']) # Example external stylesheet
server = app.server  # Expose the Flask server object for gunicorn

# Sample DataFrame (replace with your data)
df = pd.DataFrame({'x': [1, 2, 3], 'y': [4, 5, 6]})

app.layout = html.Div([
    html.H1("My Dash App"),
    dcc.Graph(
        id='example-graph',
        figure={
            'data': [{'x': df['x'], 'y': df['y'], 'type': 'bar', 'name': 'SF'}],
            'layout': {'title': 'Dash Graph'}
        }
    )
])

# ... any callbacks or other app logic ...

if __name__ == '__main__':
    app.run_server(debug=True) # Set debug=False for production!