Unable to find application in the module of a flask app, while using factory function to load app. The app runs fine while executing the app without debugging

[DeathReaper0965]

Environment data

VS Code version: 1.19.3
Python Extension version: 2018.1.0
Python Version: 3.6
OS and version: Ubuntu 17.10

Actual behavior

Error: Failed to find application in module "run". Are you sure it contains a Flask application? Maybe you wrapped it in a WSGI middleware or you are using a factory function.

Expected behavior

The flask app to begin running a localhost server.

Steps to reproduce:

• Install Visual Studio Code
• Install python extension
• Update launch.json with the correct pythonPath and program settings for python.exe and flask.exe, respectively
• Debug -> Start Debugging
• Select "Python: Flask (0.11.x or later)" as the configuration
• Press F5
• Error message is printed and debugger doesn't start

Settings

My launch.json "Python: Flask (0.11.x or later)" confugiration:

{
            "name": "Python: Flask (0.11.x or later)",
            "type": "python",
            "request": "launch",
            "stopOnEntry": false,
            "pythonPath": "${config:python.pythonPath}",
            "module": "flask",
            "cwd": "${workspaceRoot}",
            "env": {
                "FLASK_APP": "${workspaceFolder}/run.py"
            },
            "args": [
                "run",
                "--no-debugger",
                "--no-reload"
            ],
            "envFile": "${workspaceFolder}/.env",
            "debugOptions": [
                "RedirectOutput"
            ]
}

run.py file:

from module_test import create_app

if __name__ == '__main__':
    app = create_app('test', '')
    app.run(host='0.0.0.0', port=5000, debug=True)

__init.py__ file:

def create_app(config_file_name, chdir):
    app = Flask(__name__)
    return app

Logs

Output from Python output panel

Output from Console window (Help->Developer Tools menu)

[DonJayamanne]

Your sample code is incorrect, please try running it from outside vs code (e.g. in the terminal).
Here's a simple sample that will work:

from flask import Flask
app = Flask(__name__)


@app.route('/')
def hello():
    return "Hello World!"

if __name__ == '__main__':
    app.run()

[DeathReaper0965]

That cannot be possible, I'm creating the "app" in another module where the "create_app" is defined. The "create_app" function creates an app instance with required parameters and returns the app. Moreover, it runs perfectly when executed, but it fails with the above mentioned error while debugging. I request you to please consider this again as it might be an issue.

[DonJayamanne]

• Please could you provide the entire code sample so I could replicate this at my end.
  Or please upload the repo.

• Moreover, it runs perfectly when executed

How are you executing this manually?
Have you tried configuring launch.json accordingly?

[DeathReaper0965]

I edited the post, the init.py in the module contains my importing function "create_app".

How are you executing this manually?

I'm running it through the terminal inside VS Code.

Have you tried configuring launch.json accordingly?

Yes, I've even posted the configuration file above

[DonJayamanne]

Once again, Please could you provide the entire code sample so I could replicate this at my end. I don't know what your create_app looks like.

I'm running it through the terminal inside VS Code

Please provide the command executed in the terminal.

Yes, I've even posted the configuration file above

Please modify launch.json to match the command executed in the terminal window.

[brettcannon]

Because it has been more than a month since we requested more info, I'm closing this issue. If you are able to provide the info later then please do so and we can re-open the issue.