VScode Debugger Not Working with Flask-Script Commad

Question

I have a command created with flask-script and I want to debug it with VSCode debugger.

But when I run the VScode Debugger configured for Flask, it simply executes the command without stopping at the breakpoint.

But, when I specify breakpoint() in the code, it execution pauses as desired.

.vscode/launch.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Flask: Debug",
            "type": "python",
            "request": "launch",
            "program": "${workspaceFolder}/app.py",
            "args": [
                "runserver"
            ]
        }        
    ]
}

app.py

from distutils.debug import DEBUG
from flask import Flask, jsonify,request
# from flask_sqlalchemy import SQLAlchemy
import os
import click

from flask_script import Manager,Command,Server


from commands import CustomCommand

application = Flask(__name__)

manager = Manager(application)


class CustomServer(Server):
    def __call__(self, app, *args, **kwargs):
        #Hint: Here you could manipulate app
        return Server.__call__(self, app, *args, **kwargs)

# manager.add_command('db', MigrateCommand)



manager = Manager(application)
manager.add_command('runserver', CustomServer())

manager.add_command('custom_command', CustomCommand)

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

command.py

# Custom flask script command
from flask_script import Command, Option

class CustomCommand(Command):

    def run(self):
        """Run job"""
        print("Running Command. . .")
        print("Ok")

I run the command with:

python app.py custom_command

When I place VSCode breakpoint at the print command inside the run() method of CustomCommand class, it does not pause there.

What could be the issue and the fix? Thanks in advance.

Answer 1

So, the problem was in the vscode/launch.json configuration.

It seems that VSCode only looks for breakpoints when the command is executed through launch.json file. I added the configuration for custom_command and the code execution paused on the inserted breakpoint.

Here is my updated launch.json:

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Flask: Debug",
            "type": "python",
            "request": "launch",
            "program": "${workspaceFolder}/app.py",
            "args": [
                "runserver"
            ]
        },
        {
            "name": "Flask: Custom Command",
            "type": "python",
            "request": "launch",
            "program": "${workspaceFolder}/app.py",
            "args": [
                "custom_command"
            ]
        }        
    ]
}