UndefinedVariable in interactive window

[stevenlis]

Environment data

• Language Server version: v2022.11.30
• OS and version: macos 13
• Python version (& distribution if applicable, e.g. Anaconda): conda python 3.9.12

Pylance keep showing me UndefinedVariable error in the interactive window no matter what I do

[debonte]

@StevenLi-DS, can you please provide the content of your "Python Language Server" log from VS Code's output pane?

[stevenlis]

@debonte hope this gotta be helpful
pylance-log.log

[debonte]

Are you sure the diagnostic is reportUndefinedVariable? What I'm seeing is reportUnusedExpression.

If that's what you're seeing also, this is a duplicate of #3282 which was fixed in our most recent prerelease build, 2022.11.31.

[stevenlis]

This is what it's telling me as shown in the screenshot above as well.

[debonte]

I was able to repro this by downgrading my Jupyter extension to their current Release version. Can you try upgrading to the latest Pre-Release build of Jupyter? They had a regression earlier this month that caused them to start a second instance of Pylance, and I think the error you are seeing may be coming from that second instance.

That would also explain the multiple lines of type info for df seen in your first screenshot.

If you see a log like the following in the Output window in addition to the "Python Language Server" log, that would also indicate that you're hitting this.

[stevenlis]

@debonte Thanks man. Indeed, after I switch to pre-release v2022.11.1003281132 Jupyter extension, the problem is gone. Maybe Jupyter extension version should also be included in the bug report template. lol..

[debonte]

Duplicate of #3530

[stevenlis]

@debonte The issue seems back in v2023.2.10

[debonte]

@StevenLi-DS, thanks for reporting this. I haven't been able to repro the issue yet though. Can you open a new issue with steps to reproduce the problem? Might as well include your Jupyter extension version too. :)