Latest python extension for VSCode is failing on azure function debugging

[svangeti]

[11/20/19 4:52:56 PM] Starting worker process:python  /Users/user/.vscode/extensions/ms-python.python-2019.11.49689/pythonFiles/lib/python/new_ptvsd/no_wheels/ptvsd --default --host 127.0.0.1 --port 9091 --wait "/usr/local/Cellar/azure-functions-core-tools/2.7.1846/workers/python/3.7/OSX/X64/worker.py" --host 127.0.0.1 --port 50537 --workerId 07b64633-c116-433b-bb4c-b5209f85cec1 --requestId f0f35b48-8733-476c-bb66-4eeb0ef34b33 --grpcMaxMessageLength 134217728
[11/20/19 4:52:56 PM] python process with Id=15422 started
[11/20/19 4:52:56 PM] ptvsd 5.0.0a7
[11/20/19 4:52:56 PM] See https://aka.ms/ptvsd for documentation.
[11/20/19 4:52:56 PM] Usage: ptvsd [--client] --host <address> [--port <port>]
[11/20/19 4:52:56 PM]              [--wait]
[11/20/19 4:52:56 PM]              [--no-subprocesses]
[11/20/19 4:52:56 PM]              [--log-dir <path>] [--log-stderr]
[11/20/19 4:52:56 PM]              <filename> | -m <module> | -c <code> | --pid <pid>
[11/20/19 4:52:56 PM] Error: unrecognized switch --default

Environment data

• VS Code version: 1.40.1
• Extension version (available under the Extensions sidebar): 2019.11.49689
• OS and version: Mac OS X, 10.14.6
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.5
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): venv
• Relevant/affected Python packages and their versions: azure functions
• Jedi or Language Server? (i.e. what is "python.jediEnabled" set to; more info How to update the language server to the latest stable version #3977): XXX

launch.json:

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Attach to Python Functions",
      "type": "python",
      "request": "attach",
      "port": 9091,
      "preLaunchTask": "func: host start"
    }
  ]
}

Expected behaviour

Should be able to debug azure functions from VS Code local

Actual behaviour

Failing the debug with above error.

Steps to reproduce:

1. Create Azure function with Azure function extension

Logs

python process with Id=15426 started
[11/20/19 4:52:56 PM] ptvsd 5.0.0a7
[11/20/19 4:52:56 PM] See https://aka.ms/ptvsd for documentation.
[11/20/19 4:52:56 PM] Usage: ptvsd [--client] --host <address> [--port <port>]
[11/20/19 4:52:56 PM]              [--wait]
[11/20/19 4:52:56 PM]              [--no-subprocesses]
[11/20/19 4:52:56 PM]              [--log-dir <path>] [--log-stderr]
[11/20/19 4:52:56 PM]              <filename> | -m <module> | -c <code> | --pid <pid>
[11/20/19 4:52:56 PM] Error: unrecognized switch --default
[11/20/19 4:52:56 PM] Exceeded language worker restart retry count for runtime:python. Shutting down Functions Host
[11/20/19 4:52:56 PM] Stopping host...
[11/20/19 4:52:56 PM] Stopping JobHost
[11/20/19 4:52:56 PM] Job host stopped
[11/20/19 4:52:56 PM] Host shutdown completed.

[karthiknadig]

@svangeti Thanks for reporting this issue. Created a PR addressing this #8712

[karthiknadig]

@svangeti we have released version 2019.11.50794 of the extension with a fix. Please try it and let us know.

[EParisot]

Hi,
I still have the same problem on a fresh (today) install...

[23/11/2019 11:51:29] Error: unrecognized switch --default

Anyway, I downgraded to 2019.10.44104 and it works perfectly

Thanks

[karthiknadig]

@EParisot Can you provide the output for python? At the top you should see something like this. Can you share that?