building_callbacks_with_single_input_output_without_id.py

from dash import Dash, html, dcc, Input, Output

app = Dash()

input_text = dcc.Input(value='Change this text', type='text')
output_text = html.Div()

app.layout = html.Div([input_text, output_text])


@app.callback(
    Output(component_id=output_text, component_property='children'),
    Input(component_id=input_text, component_property='value')
)
def update_output_div(input_text):
    return f'Text: {input_text}'


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