Dash VSCode Debugging

Dash Python
1

When I run my Dash app from the command line using

export PYTHONPATH=./src/ && python ./src/pdv/app.py

it runs properly, however, when I try to run it with the debugger (using the following configuration in my launch.json

       {
           "name": "Python: Current File",
           "type": "python",
           "request": "launch",
           "program": "${file}",
           "console": "integratedTerminal",
           "env": { "PYTHONPATH": "${workspaceRoot}/src/"}
        },

I get the following error:

Dash is running on http://127.0.0.1:8050/

 * Serving Flask app 'app' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on
No module named app

Any ideas what’s wrong with my debug configuration?

Also, the settings from here work properly, but I’m trying to run as native Dash App, instead of Flask

1 Like
2

Open Folder to the folder where your app.py is located.

3

Do you mean adding this to the settings.json?

4

VSCode’s menu.
File → Open Folder

5

This dash app is a subapp for a larger suite, and I was hoping to incorporate this into the launch.json without requiring being in a specific directory… Oddly, this seems to work if debug is set to False

6

I just ended up using Flask instead (for anyone with same problem)

{
            "name": "Debug pdv plots",
            "type": "python",
            "request": "launch",
            "module": "flask",
            "env": {
                "PYTHONPATH": "${workspaceRoot}/src/",
                "FLASK_APP": "${workspaceRoot}/src/pdv/DashAppDebug",
                "FLASK_ENV": "development",
                "FLASK_DEBUG": "1"
            },
            "args": [
                "run",
            ],
        }
1 Like