How to send a filename to start a Dash App

Dash Python
1

I can start a Dash app by using app.run(debug=True)

Now, I need to send a filename to start the Dash App. The Dash App will load the file from the filename, and then do some calculations. How to do that/load filenames to start the app?

Did not find examples online

2

Depending on how you start the app, one option could be to use pass command line arguments? Another option could be environment variables.

3

Another option could be a “config” file.

4

Sounds good to be a solution.

I can write the filename to configure file, and then Dash.app can load a fixed configure file.

I am wondering whether the run function below allows me to deliver a parameter like a string for filename to be loaded

app.run(
    host='127.0.0.1',
    port='42843',
    proxy=None,
    debug=None,
    jupyter_mode: typing_extensions.Literal['inline',
    'external',
    'jupyterlab',
    'tab',
    '_none'] = None,
    jupyter_width='100%',
    jupyter_height=650,
    jupyter_server_url=None,
    dev_tools_ui=None,
    dev_tools_props_check=None,
    dev_tools_serve_dev_bundles=None,
    dev_tools_hot_reload=None,
    dev_tools_hot_reload_interval=None,
    dev_tools_hot_reload_watch_interval=None,
    dev_tools_hot_reload_max_retry=None,
    dev_tools_silence_routes_logging=None,
    dev_tools_prune_errors=None,
    **flask_run_options
)
5

OK. I finally solve it.

I create a class as wrapper, where Dash app is an attribute in the object.

The instance of this class will load files first, and then start the Dash app