How to fix Jupyter extension activation failed when opening python files?

Question

I installed python lately on my macos system and when I try to open a python file I see this error popup about Jupyter extension :

Answer 1

Just ran into this today (I'm on MacOS for my work computer). In my case, upgrading to the pre-release version of the Jupyter extension (v2022.5.1001281006) solved it right away.

If you're not an experienced programmer/software engineer, as is the case for me, I suggest trying to upgrade (or roll back) either VS code or the plugin itself before going with your own dev code for the plugin, as with @CAG2 pt2 answer. (Personally, I had trouble finding a 'product.json' file; perhaps you need an insider's build of VS code for that kind of thing [edit]: https://code.visualstudio.com/api/advanced-topics/using-proposed-api, in which case I think you'd be editing 'package.json').

Answer 2

I had this same issue and finally got it fixed!

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If you are on an Linux and are using an Arch-based distro with AUR support, simply install the code-features package using:

yay -S code-features

or any AUR helper of your choosing.

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On other operating systems, you should do the following:

Open your VSCode's product.json. I do not know where this file is on your operating system, so please do some research.

Look for the following line:

"extensionAllowedProposedApi": [ ...

Add the following entry to that array:

"ms-toolsai.jupyter": ["notebookConcatTextDocument", 
    "notebookControllerKind", "notebookDebugOptions", "notebookDeprecated", 
    "notebookEditor", "notebookEditorDecorationType", "notebookEditorEdit", 
    "notebookMessaging", "notebookMime", "notebookCellExecutionState", 
    "portsAttributes", "textDocumentNotebook", "quickPickSortByLabel"]

For example, if the line was originally:

"extensionAllowedProposedApi": [ "extension1", "extension2" ]

Then change it to:

"extensionAllowedProposedApi": [ "extension1", "extension2", 
    "ms-toolsai.jupyter": ["notebookConcatTextDocument", 
    "notebookControllerKind", "notebookDebugOptions", "notebookDeprecated", 
    "notebookEditor", "notebookEditorDecorationType", "notebookEditorEdit", 
    "notebookMessaging", "notebookMime", "notebookCellExecutionState", 
    "portsAttributes", "textDocumentNotebook", "quickPickSortByLabel"] ]

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Note that with the second method, you will need to edit product.json every time you update VSCode.