I managed to get this working in PTVSD, won't be working on this as it's not a priority, unless that changes.
Will end up implementing in ptvsd as it is required for VS.

Support has been added in PTVSD.

Hi, @DonJayamanne is this working now ? thanks!

Hi, @DonJayamanne
I have two questions here. First, can you provide an estimation of the date when it can be finished? Second, when PID is supported, do we still need to inject ptvsd package? Since this one is not a good design as we need to add IDE specific code into our own script. Is there any possible you can do it just like Pycharm, and run ptvsd_enable/wait automatically in background? Looks forward to hearing from you soon. Thanks.

Is anyone working on this feature? I just tried to connect to a locally running python script and was surprised when I figured out that this hasn't been implemented. Would love an ETA if it's on the roadmap.

If this feature is important please do upvote 👍 the issue so we can track the number of users interested in this and accordingly prioritize it in our sprints.
We do all of our planning on zenhub, you should be able to see it our plans for each Sprint in there.
In the interim, We welcome any contributions to the extension.
Finally this issue is not in the current Sprint.

@karthiknadig isn't this working now?

@luabud In ptvsd yes. But there is no UI support for this in the extension.

@luabud Hello, ptvsd works for me too, but I can't find a way to avoid adding special code for it in my script. Just like it works on Visual Studio python plugin. That'd be so handy ...

@DonJayamanne should we change this to track UI support in this extension, and add "needs spec"?

Yes agreed we need a spec. It's fairly simple, you can look at how nodejs and c# support this (simple drop-down list of processes).

This feature is under experiment, but for those who would like to try it out:

1. Install the Insiders build. You can do this by opting in the Insiders Program, by opening the command palette (View > Command Palette...) and running "Python: Switch to Insiders Weekly Channel".
2. Open the user settings file (in the command palette, run "Preferences: Open Settings (JSON)") and add this to it:

"python.experiments.optInto": [
        "PtvsdWheels37 - experiment"
    ],

3. Now when you open the launch.json file and click to add a configuration, you can select "Python" and then "Attach using Process ID". If you don't have a launch.json file, you just need to start debugging (e.g. with F5) and then you'll see the same options below.

If you have any issues with it, please file a new issue here, filling the information in the template there.

We look forward to having this available to everyone soon 😊 then steps 1 and 2 won't be needed.