Unable to run usage.py due to dash exception caused by app.run_server

[PreciousChicken]

Describe the issue

On running python usage.py an exception is thrown as shown:

Traceback (most recent call last):
  File "[...]/usage.py", line 10, in <module>
    app.run_server(debug=True)
    ^^^^^^^^^^^^^^
  File "[...]/venv/lib/python3.13/site-packages/dash/_obsolete.py", line 22, in __getattr__
    raise err.exc(err.message)
dash.exceptions.ObsoleteAttributeException: app.run_server has been replaced by app.run

To reproduce

Install template as per:

cookiecutter gh:plotly/dash-typescript-component-template

Enter relevant directory, install dependencies and run:

python -m venv venv
source venv/bin/activate
pip install -r requirements.txt
npm install
npm run build
python usage.py

Expected behaviour

Dash to run on local server.

Configuration

• OS: Manjaro Linux 25.0.0
• npm: 11.0.0
• node: 22.13.1
• python: 3.13.2

Additional context

Happy to provide a PR to fix.

[jminnion]

Hey @PreciousChicken, you may already know this but for Dash 3.0.0, the app.run_server function was removed. It had been deprecated, and app.run is the suggested replacement. Here's the PR where it was removed: plotly/dash#3078

Replacing app.run_server(debug=True) with app.run(debug=True) may solve your issue (though it remains an edit to be made to this repo). Again this may all be old news to you (based on your offer to provide a PR to fix), just sharing this info in case it is useful to you or others reading this issue.

[PreciousChicken]

Hi yes, I was aware (the error message pretty much nails it in this case), but thank you, good to be explicit.