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Setup custom launcher with paths as a param values in VS Code (Flask – certificate path)

There is an example in Visual Studio Code python setup tutorial it is shown how to setup Flask. My problem starts when I try to provide self-signed certificate paths. I’ve tried to add following configuration:

    {
        "name": "Python: Flask",
        "type": "python",
        "request": "launch",
        "module": "flask",
        "env": {
            "FLASK_APP": "app.py"
        },
        "args": [
            "run",
            "--debugger",
            "--no-reload",
            "--host",
            "0.0.0.0",
            "--port",
            "4443",
            "--key",
            "${workspaceFolder}\viberbot\key.pem",
            "--cert",
            "${workspaceFolder}\viberbot\certificate.pem"
        ],
        "jinja": true
    },

I’ve tried to provide key/cert as:

  • C:\FULL_PATH\TO\FILE
  • C:/FULL_PATH/TO/FILE
  • ‘C:\FULL_PATH\TO\FILE’
  • “C:\FULL_PATH\TO\FILE”

and I always getting one of these error messages: Error: Invalid value for "--key": "--cert" must also be specified. or Error: Invalid value for "--key": File ""E:Docslearn_pyviberbotkey.pem"" does not exist.

This is the exact command generated by VS Code extension:

cd e:Docslearn_py && cmd /C “set “FLASK_APP=app.py” && set “PYTHONIOENCODING=UTF-8” && set “PYTHONUNBUFFERED=1″ && C:UsersuserAppDataLocalProgramsPythonPython37python.exe c:Usersuser.vscodeextensionsms-python.python-2019.2.5558pythonFilesptvsd_launcher.py –default –client –host localhost –port 50573 -m flask run –debugger –no-reload –host 0.0.0.0 –port 4443 –key E:Docslearn_pyviberbotkey.pem –cert E:Docslearn_pyviberbotcertificate.pem ” Usage: python -m flask run [OPTIONS] Try “python -m flask run –help” for help.

Error: Invalid value for “–key”: “–cert” must also be specified.

UPDATE: after making the change suggested by Brett I’ve started to get another error:

 * Serving Flask app "app.py"
 * Environment: development
 * Debug mode: off
Usage: python -m flask run [OPTIONS]

Error: Could not import "app".

I’ve tried to change app.py to ${workspaceFolder}\viberbot\app.py or providing a path like /E/path/viberbot/app.py and it didn’t work.

UPDATE2: I needed to do "FLASK_APP": "viberbot\app.py"

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Answer

It might be because the example in the tutorial is out of date compared to the default that VS Code provides. Try:

{
            "name": "Flask",
            "type": "python",
            "request": "launch",
            "module": "flask",
            "env": {
                "FLASK_APP": "app.py",
                "FLASK_ENV": "development",
                "FLASK_DEBUG": "0"
            },
            "args": [
                "run",
                "--no-debugger",
                "--no-reload",
                "--cert",
                "${workspaceFolder}\viberbot\certificate.pem",
                "--key",
                "${workspaceFolder}\viberbot\key.pem"
            ],
            "jinja": true
        }
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